http://www.championmicro.com.tw EPA/80++ ZVS-Like PFC/PWM COMBO C
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CM6802A/B/AH/BH (Dynamic Soft PFC/Green PWM)
http://www.championmicro.com.tw
EPA/80++ ZVS-Like PFC/PWM COMBO CONTROLLER
Design High Efficient Power Supply both Full Load Light Load
GENERAL DESCRIPTION
Switching CM6802A/B/AH/BH from your existing CM6800 family boards gain following advanced performances: Around efficiency gain when output load below full load. Hold time increased from existing 6800 power supply. 420V bulk capacitor value reduced boost ripple current reduced; therefore, boost inductor core size maybe reduced. Load Consumption reduced 290mW 270VAC. transformer size smaller. design 12V, 3.3V output filters easy. stress over entire external power device reduced noise maybe reduced. Monotonic Output design easy more.Of cause, cost will reduced.
FEATURES
Patents Pending compatible ML4800 FAN4800. Bi-CMOS process. Designed EPA/80++ efficiency. CM6802A/B Selectable Boost output from 380V 300V during light load. CM6802AH/BH: Selectable Boost output from 380V 342V during light load. high voltage resistors greater than Mega (4.7 Mega Mega ohm) improve load consumption. Rail rail CMOS Drivers with off, both with zeners. Fast Start-UP Circuit without extra bleed resistor reaches sooner. start-up current (55uA typ.) operating current (2.5mA typ.) 16.5V shunt regulator Leading Edge Blanking both PWM. fRTCT 4*fpfc =4*fpwm CM6802A//AH fRTCT 4*fpfc =2*fpwm CM6802B/BH Dynamic Soft ease stress Power Device Ease filter design. Brown Brown Internally synchronized leading edge trailing edge Reduces ripple current 420V storage capacitor between sections. total harmonic distortion, Power Factor approaches 1.0. Average current, continuous discontinuous boost leading edge PFC. configurable current mode feed-forward voltage mode operation. Current Gain Modulator improved noise immunity. Gain Modulator constant maximum power limiter. Brown-out control, over-voltage protection, UVLO, soft start, Reference Short Circuit Protection Power Fold Back Protection Green Mode less load consumption. with CM6800,CM6800A,
CM6802A/B/AH/BH compatible with CM6800 family. Beside goodies CM6800, designed meet EPA/80+ regulation. With proper design, efficiency power supply easily approach 85%. start evaluating CM6802A/B/AH/BH from exiting CM6800,CM6800A ML4800 board, things need taken care before doing fine tune: Change resistor IAC) from value higher resistor value between Mega ohms Mega ohms. Change RTCT (pin from existing value RT=7.75K CT=1000pF have fpfc=55Khz, fpwm=55Khz, frtct=220Khz. Adjust high voltage resistor around mega higher. VRMS (pin needs 1.125V VIN=85VAC universal input application from line input from 85VAC 270VAC. Both poles Vrms CM6802A/B/AH/BH needs substantially slow than CM6800 about times. full load, average Veao needs around 4.5V ripple Veao needs less than 250mV. Soft Start (pin soft start current been reduced from CM6800's 20uA CM6802A/B/AH/BH's 10uA.Soft Start capacitor reduced from your original CM6800 capacitor.
2009/11/02
Rev.
Champion Microelectronic Corporation
CM6802A/B/AH/BH (Dynamic Soft PFC/Green PWM)
http://www.championmicro.com.tw
EPA/80++ ZVS-Like PFC/PWM COMBO CONTROLLER
Design High Efficient Power Supply both Full Load Light Load
APPLICATIONS
EPA/80++ related Power Supply Desktop Power Supply Internet Server Power Supply Power Supply Power Supply Power Supply Battery Charger Motor Power Supply Monitor Power Supply Telecom System Power Supply Distributed Power
CONFIGURATION
SOP-16 (S16) PDIP-16 (P16)
IEAO ISENSE VRMS RAMP1 RAMP2
VEAO VREF ILIMIT
DESCRIPTION
Symbol Description
transconductance current error amplifier output (Gmi). functions: gain modulator reference input. start connected helps reduce startup time helps reduce load consumption. Typical resistor about Mega sense line. Current Sense: both Gain Modulator ILIMIT comparator. Line Input Sense also, brown sense pin. Soft start capacitor pin; on/off boost
Operating Voltage Min. Typ. Max. VREF Unit
IEAO
ISENSE VRMS
-1.2
VCC+0.3
follower function; pulled down internal resistor when DCILIMIT reach power limited during Brown out.
2009/11/02
Rev.
Champion Microelectronic Corporation
CM6802A/B/AH/BH (Dynamic Soft PFC/Green PWM)
http://www.championmicro.com.tw
EPA/80++ ZVS-Like PFC/PWM COMBO CONTROLLER
Design High Efficient Power Supply both Full Load Light Load
RAMP
voltage feedback input.
(RTCT)
Oscillator timing node; timing
current mode, this functions current sense input; when voltage mode, feed-forward sense (PWM RAMP) input from output 380V (feed forward ramp).
RAMP
VDCmax-1.8
ILIMIT VREF
current limit comparator input
Ground
driver output
driver output
Positive supply CM6802A/B/AH/BH Maximum buffered output internal 7.5V reference when VCC=14V transconductance voltage error amplifier input
VEAO
transconductance voltage error amplifier output (GmV)
ORDERING INFORMATION
Part Number CM6802A/B/AH/BHGIP* CM6802A/B/AH/BHGIS* CM6802A/B/AH/BHGISTR* CM6802A/B/AH/BHXIP* CM6802A/B/AH/BHXIS* CM6802A/B/AH/BHXISTR* Temperature Range Package 16-Pin PDIP (P16) 16-Pin Narrow (S16) 16-Pin Narrow (S16) 16-Pin PDIP (P16) 16-Pin Narrow (S16) 16-Pin Narrow (S16)
*Note: Suffix Free Product
Package Typing Reel Suffix Halogen Free Product
2009/11/02
Rev.
Champion Microelectronic Corporation
CM6802A/B/AH/BH (Dynamic Soft PFC/Green PWM)
http://www.championmicro.com.tw
EPA/80++ ZVS-Like PFC/PWM COMBO CONTROLLER
Design High Efficient Power Supply both Full Load Light Load
Simplified Block Diagram (CM6802A/B/AH/BH)
VEAO
IEAO
2.5V VRMS ISENSE
Tri-Fault 0.5V -1.0V ISENSE 0.3V VEAO
GAIN MODULATOR Rmul RAMP
Rmul
2.85V
16.5V Zener
7.5V REFERENCE
VREF
ILIMIT
MPPFC MNPFC ZENER
Green
PFCCLK
RAMP1
RAMP2 SPST PWMCLK Green
REF-OK
380-OK
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum ratings those values beyond which device could permanently damaged. Parameter Min. Max. IEAO VREF+0.3 ISENSE Voltage PWMOUT Voltage Other IREF Input Current Peak Current, Source Sink Peak Current, Source Sink OUT, Energy Cycle Junction Temperature Storage Temperature Range Operating Temperature Range Lead Temperature (Soldering, sec) Thermal Resistance (JA) Plastic Plastic SOIC Power Dissipation (PD) TA<50 Capability, Model Capability, Model 1250 Units
2009/11/02
Rev.
Champion Microelectronic Corporation
ILIMIT
1.0V
VREF+2.5V 10uA
1.8V
PPWM NPFC ZENER
2.36V
380V-OK
ILIMIT
UVLO
CM6802A/B/AH/BH (Dynamic Soft PFC/Green PWM)
http://www.championmicro.com.tw
EPA/80++ ZVS-Like PFC/PWM COMBO CONTROLLER
Design High Efficient Power Supply both Full Load Light Load
ELECTRICAL CHARACTERISTICS:
Unless otherwise stated, these specifications apply Vcc=+14V, 7.75K 1000pF, TA=Operating Temperature Range (Note
Symbol
Parameter
Test Conditions
CM6802A/B/AH/BH Min. Typ. Max.
Unit
Brown VRMS Threshold High VRMS Threshold Hysteresis High Line Line Hysteresis Voltage Error Amplifier (gmv) Input Voltage Range Transconductance Feedback (High) Feedback (Low) Input Bias Current Output High Voltage Output Voltage Sink Current Source Current Open Loop Gain Power Supply Rejection Ratio Current Error Amplifier (gmi) Input Voltage Range (Isense pin) Transconductance Input Offset Voltage Output High Voltage Output Voltage VNONINV VINV, IEAO 1.5V T=25 VEAO=0V, open -1.2 VEAO 1.5V 1.5V, VEAO 2.45V gain 16.5V Reference Voltage CM6802A/B SS>VREF Veao Reference VNONINV VINV, VEAO 2.25V T=25 Voltage VREF Veao 2.5V 2.17 -1.0 2.51 2.26 -0.05 2.62 2.35 Sweep Vrms Sweep Vrms Room Temperature=25 Room Temperature=25 1.19 0.97 2.15 1.85 1.25 1.05 2.25 1.32 1.13 2.35 2.12
CM6802AH/BH 1.75V Vrms Note
2009/11/02
Rev.
Champion Microelectronic Corporation
CM6802A/B/AH/BH (Dynamic Soft PFC/Green PWM)
http://www.championmicro.com.tw
EPA/80++ ZVS-Like PFC/PWM COMBO CONTROLLER
Design High Efficient Power Supply both Full Load Light Load
ELECTRICAL CHARACTERISTICS:
(Conti.) Unless otherwise stated, these specifications apply Vcc=+14V, 7.75 1000pF, TA=OperatingTemperature Range (Note
CM6802A/B/AH/BH Min. Sink Current Source Current Open Loop Gain Power Supply Rejection Ratio Comparator Threshold Voltage Hysteresis Green Power Detect Comparator Veao Threshold Voltage Tri-Fault Detect Fault Detect HIGH Time Fault Detect HIGH VFB=VFAULT DETECT VFB=OPEN, 470pF from Fault Detect ILIMIT Comparator Threshold Voltage (PFCILIMIT- Gain Modulator Output) Delay Output (Note ILIMIT Comparator Threshold Voltage Delay Output (Note Brown Comparator Threshold Voltage Hysteresis 2.20 2.36 2.52 1000 Overdrive Voltage 100mV 0.92 1.08 Overdrive Voltage -100mV -1.10 -1.00 -0.90 2.70 2.85 0.15 0.25 0.35 2.70 2.85 ISENSE -0.5V, IEAO 1.5V ISENSE +0.5V, IEAO 4.0V Gain 16.5V Typ. Max.
Symbol
Parameter
Test Conditions
Unit
2009/11/02
Rev.
Champion Microelectronic Corporation
CM6802A/B/AH/BH (Dynamic Soft PFC/Green PWM)
http://www.championmicro.com.tw
EPA/80++ ZVS-Like PFC/PWM COMBO CONTROLLER
Design High Efficient Power Supply both Full Load Light Load
ELECTRICAL CHARACTERISTICS:
(Conti.) Unless otherwise stated, these specifications apply Vcc=+14V, 7.75 1000pF, TA=OperatingTemperature Range (Note
CM6802A/B/AH/BH Min. Typ. Max.
Symbol GAIN Modulator
Parameter
Test Conditions
Unit
Gain1 (Note Gain2 (Note Gain3 (Note Gain4 (Note Bandwidth (Note Output Voltage Rmul (ISENSE-IOFFSET) Oscillator (Measuring fpfc) Initial fpfc Accuracy Voltage Stability Temperature Stability Total Variation Ramp Valley Peak Voltage Dead Time (Note Discharge Current Light Load Veao Threshold Light Load Threshold (High) Light Load Threshold (Low) Hysteresis
VRMS =1.125, 2.375V T=25 SS<VREF VRMS 1.45588V, 2.375V T=25 SS<VREF VRMS =2.91V, 2.375V T=25 SS<VREF VRMS 3.44V, 2.375V T=25 SS<VREF VRMS 1.125V, 2.0V SS<VREF
1.45
4.65
1.75 1.45
0.78
0.87
7.75 1000pF, IAC=0uA 16.5V
55.5
Line, Temp VEAO=6V IAC=20uA
VRAMP2 VRAMP1 2.5V
Room Temperature=25 Room Temperature=25
2.325 1.625
2.50 1.75
2.658 1.88
2009/11/02
Rev.
Champion Microelectronic Corporation
CM6802A/B/AH/BH (Dynamic Soft PFC/Green PWM)
http://www.championmicro.com.tw
EPA/80++ ZVS-Like PFC/PWM COMBO CONTROLLER
Design High Efficient Power Supply both Full Load Light Load
ELECTRICAL CHARACTERISTICS
Symbol Reference Output Voltage Line Regulation Parameter
(Conti.) Unless otherwise stated, these specifications apply
CM6802A/B/AH/BH Min. Typ. Max.
Vcc=+14V, 7.75k, 1000pF, TA=Operating Temperature Range (Note Test Conditions Unit
I(VREF) 16.5V@ T=25 VCC=10.5V,0mA I(VREF) 2mA; T=25 VCC=14V,0mA I(VREF) 3.5mA; -40~85 Line, Load, Temp 125, 1000HRs IEAO 4.5V VIEAO 1.2V IOUT -20mA T=25 IOUT -100mA T=25 IOUT 10mA, T=25
Load Regulation
Temperature Stability Total Variation Long Term Stability Minimum Duty Cycle Maximum Duty Cycle Output Rdson
11.5
Output High Rdson Rise/Fall Time (Note Duty Cycle Range
IOUT 20mA T=25 IOUT 100mA T=25 100pF T=25 0-49.5 IOUT -20mA T=25
0-50 11.5 26.5
Output Rdson
IOUT -100mA T=25 IOUT 10mA, IOUT 20mA T=25 IOUT 100mA T=25 100pF Room Temperature=25
Output High Rdson Rise/Fall Time (Note Comparator Level Shift Soft Start Soft Start Current Supply Start-Up Current Operating Current Undervoltage Lockout Threshold Undervoltage Lockout Hysteresis Shunt Regulator (VCC zener) Zener Threshold Voltage
10.5
12V, T=25 14V, CM6802A/B/AH/BH CM6802A/B/AH/BH Apply with Iop=20mA 12.35 16.2
12.85 2.95 16.8
13.45 17.4
Note Limits guaranteed 100% testing, sampling, correlation with worst-case test conditions. Note Includes bias currents other circuits connected pin. Note Gain 5.3V; (ISENSE IOFFSET) [IAC (VEAO 0.7)]-1; VEAOMAX Note Guaranteed design, 100% production test.
2009/11/02
Rev.
Champion Microelectronic Corporation
CM6802A/B/AH/BH (Dynamic Soft PFC/Green PWM)
http://www.championmicro.com.tw
EPA/80++ ZVS-Like PFC/PWM COMBO CONTROLLER
Design High Efficient Power Supply both Full Load Light Load
TYPICAL PERFORMANCE CHARACTERISTIC:
Soft Diagram
Dynamic Soft Performance Vin=110
380V bulk voltage which 100V/div. Input Line Current which 1A/div. Input Line Voltage (110 Vac) turned 40mS before reaching Brownout which 209Vdc. When bulk voltage goes below 209V, system will reset soft start. result CM6802A/B/AH/BH Input Line Current clean softly even system does reset soft-start.
Dynamic Soft Performance Vin=220
380V bulk voltage which 100V/div. Input Line Current which 1A/div. Input Line Voltage (220 Vac) turned 40mS before reaching Brownout which 209Vdc when Bulk voltage drops below 209V. When bulk voltage goes below 209V, system will reset soft start. result CM6802A/B/AH/BH Input Line Current clean softly even system does reset itself. first peak current beginning time inrush current.
2009/11/02
Rev.
Champion Microelectronic Corporation
CM6802A/B/AH/BH (Dynamic Soft PFC/Green PWM)
http://www.championmicro.com.tw
EPA/80++ ZVS-Like PFC/PWM COMBO CONTROLLER
Design High Efficient Power Supply both Full Load Light Load
Turn Timing
Output 100% load turn waveform 110Vac
380V bulk voltage which 100V/div. VCC,Ch3 SS(soft start pin),CH4 Vo(12V).
Output load turn waveform 230Vac
Output 100% load turn waveform 230Vac
380V bulk voltage which 100V/div. VCC,Ch3 SS(soft start pin),CH4 Vo(12V)
380V bulk voltage which 100V/div. VCC,Ch3 SS(soft start pin),CH4 Vo(12V)
Dynamic load:
Output step load 100% load 90Vac Output step 100% load load 90Vac
380V bulk voltage which 100V/div. VCC,Ch3 SS(soft start pin),CH4 Vo(12V)
380V bulk voltage which 100V/div. VCC,Ch3 SS(soft start pin),CH4 Vo(12V)
2009/11/02
Rev.
Champion Microelectronic Corporation
CM6802A/B/AH/BH (Dynamic Soft PFC/Green PWM)
http://www.championmicro.com.tw
EPA/80++ ZVS-Like PFC/PWM COMBO CONTROLLER
Design High Efficient Power Supply both Full Load Light Load
Output step load 100% load 230Vac Output step 100% load load 230Vac
380V bulk voltage which 100V/div. VCC,Ch3 SS(soft start pin),CH4 Vo(12V)
380V bulk voltage which 100V/div. VCC,Ch3 SS(soft start pin),CH4 Vo(12V)
power cycling
90VAC turn 500ms turn 100ms 10%LOAD
input voltage which 100V/div. stage Mosfet drain current, Vo(12V)
stage Mosfet Drain current(zoom out)
90VAC turn 500ms turn 100ms 100%LOAD
input voltage which 100V/div. stage Mosfet drain current, Vo(12V)
stage Mosfet Drain current(zoom out)
2009/11/02
Rev.
Champion Microelectronic Corporation
CM6802A/B/AH/BH (Dynamic Soft PFC/Green PWM)
http://www.championmicro.com.tw
EPA/80++ ZVS-Like PFC/PWM COMBO CONTROLLER
Design High Efficient Power Supply both Full Load Light Load
90VAC turn 500ms turn 10ms 10%LOAD
input voltage which 100V/div. stage Mosfet drain current, (12V)
stage Mosfet Drain current (zoom out)
90VAC turn 500ms turn 10ms 100%LOAD
input voltage which 100V/div. stage Mosfet drain current, (12V)
stage Mosfet Drain current (zoom out)
230VAC turn 500ms turn 100ms 10%LOAD
input voltage which 100V/div. stage Mosfet drain current, (12V)
stage Mosfet Drain current (zoom out)
2009/11/02
Rev.
Champion Microelectronic Corporation
CM6802A/B/AH/BH (Dynamic Soft PFC/Green PWM)
http://www.championmicro.com.tw
EPA/80++ ZVS-Like PFC/PWM COMBO CONTROLLER
Design High Efficient Power Supply both Full Load Light Load
230VAC turn 500ms turn 100ms 100%LOAD
input voltage which 100V/div. stage Mosfet drain current, (12V)
stage Mosfet Drain current (zoom out)
230VAC turn 500ms turn 10ms 10%LOAD
input voltage which 100V/div. stage Mosfet drain current, (12V)
stage Mosfet Drain current (zoom out)
230VAC turn 500ms turn 10ms 100%LOAD
input voltage which 100V/div. stage Mosfet drain current, (12V)
stage Mosfet Drain current (zoom out)
2009/11/02
Rev.
Champion Microelectronic Corporation
CM6802A/B/AH/BH (Dynamic Soft PFC/Green PWM)
http://www.championmicro.com.tw
EPA/80++ ZVS-Like PFC/PWM COMBO CONTROLLER
Design High Efficient Power Supply both Full Load Light Load
Getting Start:
start evaluating CM6802A/B/AH/BH from exiting CM6800 ML4800 board, things need taken care before doing fine tune: Change resistor IAC) from value higher resistor value between Mega ohms Mega ohms. Change RTCT (pin from existing value RT=7.0K CT=1000pF have fpfc=55 Khz, fpwm=55Khz, fRTCT=220Khz CM6802A/AH fpfc=55 Khz, fpwm=110Khz, fRTCT=220Khz CM6802B/BH. Adjust high voltage resistor around mega higher. VRMS (pin needs 1.125V VIN=85VAC universal input application from line input from 85VAC 270VAC. Both poles Vrms CM6802A/B/AH/BH needs substantially slow than CM6800 about times. full load, average Veao needs around 4.5V ripple Veao needs less than 250mV. Soft Start (pin soft start current been reduced from CM6800's 20uA CM6802A/B/AH/BH's 10uA.Soft Start capacitor reduced from your original CM6800 capacitor. Functional Description CM6802A/B/AH/BH designed high efficient power supply both full load light load. popular EPA/80++ PFC-PWM power supply controller. CM6802A/B/AH/BH consists average current controlled, continuous/discontinuous boost Power Factor Correction (PFC) front synchronized Pulse Width Modulator (PWM) back end. used either current voltage mode. voltage mode, feed-forward from output used improve PWM's line regulation. either mode, stage uses conventional trailing edge duty cycle modulation, while uses leading edge modulation. This patented leading/trailing edge modulation technique results higher usable error amplifier bandwidth, significantly reduce size buss capacitor. synchronized with simplifies compensation controlled ripple output capacitor (the input capacitor). addition power factor correction, number protection features have been built into CM6802A/B/AH/BH. These include soft-start, over-voltage protection, peak current limiting, brownout protection, duty cycle limiting, under-voltage lockout.
Power Factor Correction
Power factor correction makes nonlinear load look like resistive load line. resistor, current drawn from line phase with proportional line voltage, power factor unity (one). common class nonlinear load input most power supplies, which bridge rectifier capacitive input filter from line. peak-charging effect, which occurs input filter capacitor these supplies, causes brief high-amplitude pulses current flow from power line, rather than sinusoidal current phase with line voltage. Such supplies present power factor line less than (i.e. they cause significant current harmonics power line frequency appear their input). input current drawn such supply other nonlinear load) made follow input voltage instantaneous amplitude, will appear resistive line unity power factor will achieved. hold input current draw device drawing power from line phase with proportional input voltage, must found prevent that device from loading line except proportion instantaneous line voltage. section CM6802A/B/AH/BH uses boost-mode DC-DC converter accomplish this. input converter full wave rectified line voltage. bulk filtering applied following bridge rectifier, input voltage boost converter ranges twice line frequency) from zero volts peak value input back zero. forcing boost converter meet simultaneous conditions, possible ensure that current drawn from power line proportional input line voltage. these conditions that output voltage boost converter must higher than peak value line voltage. commonly used value 385VDC, allow high line 270VACrms. other condition that current drawn from line given instant must proportional line voltage. Establishing suitable voltage control loop converter, which turn drives current error amplifier switching output driver satisfies first these requirements. second requirement using rectified line voltage modulate output voltage control loop. Such modulation causes current error amplifier command power stage current that varies directly with input voltage. order prevent ripple, which will necessarily appear output boost circuit (typically about 10VAC 385V level); from introducing distortion back through voltage error amplifier, bandwidth voltage loop deliberately kept low. final refinement adjust overall gain such proportional 1/(Vin Vin), which linearizes transfer function system input voltage varies. Since boost converter topology CM6802A/B/AH/BH current-averaging type, slope compensation required. More exactly, output current gain modulator given
2009/11/02
Rev.
Champion Microelectronic Corporation
CM6802A/B/AH/BH (Dynamic Soft PFC/Green PWM)
http://www.championmicro.com.tw
EPA/80++ ZVS-Like PFC/PWM COMBO CONTROLLER
Design High Efficient Power Supply both Full Load Light Load
Dynamic Soft (patent pending) Besides goodies from CM6800A, Dynamic Soft main feature CM6802A/B/AH/BH. Dynamic Soft improve efficiency, reduce power device stress, ease EMI, ease monotonic output design while more protection such short circuit with power fold back protection. unique sequential control maximizes performance protections among steady state, transient power on/off conditions. Section: Gain Modulator Figure shows block diagram section CM6802A/B/AH/BH. gain modulator heart PFC, this circuit block which controls response current loop line voltage waveform frequency, line voltage, output voltages. There three inputs gain modulator. These are: current representing instantaneous input voltage (amplitude wave-shape) PFC. rectified input sine wave converted proportional current resistor then into gain modulator IAC. Sampling current this minimizes ground noise, required high power switching power conversion environments. gain modulator responds linearly this current. voltage proportional long-term line voltage, derived from rectified line voltage after scaling filtering. This signal presented gain modulator VRMS. gain modulator's output inversely proportional VRMS (except unusually values VRMS where special gain contouring takes over, limit power dissipation circuit components under heavy brownout conditions). relationship between VRMS gain called illustrated Typical Performance Characteristics. output voltage error amplifier, VEAO. gain modulator responds linearly variations this voltage. output gain modulator current signal, form full wave rectified sinusoid twice line frequency. This current applied virtual-ground (negative) input current error amplifier. this gain modulator forms reference current error loop, ultimately controls instantaneous current draw from power line. general formula output gain modulator Imul Gain VRMS (pin4) When VRMS below shut off. Designer needs design 85VAC with VRMS average voltage=1.125V. Gain=Imul/Iac K=Gain/(VEAO-0.7V) Imul (VEAO 0.7V) Where units [V-1] Note that output current gain modulator limited around maximum output voltage gain modulator limited 100uA 7.75K=~0.8V. This 0.8V also will determine maximum input power. However, IGAINMOD cannot measured directly from ISENSE. ISENSE IGAINMOD-IOFFSET IOFFSET only measured when VEAO less than 0.5V IGAINMOD Typical IOFFSET around 33uA.
IAC=20uA, Veao=6V
Gain
SENSE OFFSET
Selecting input gain modulator. also current mirror input requires current input. selecting proper resistor RAC, will provide good sine wave current derived from line voltage also helps program maximum input power minimum input line voltage. RAC=Vin peak 39.09K. example, minimum line voltage 85VAC, RAC=85 1.414 39.09K Mega ohm.
VEAO 0.7V) constant VRMS2
2009/11/02
Rev.
Champion Microelectronic Corporation
CM6802A/B/AH/BH (Dynamic Soft PFC/Green PWM)
http://www.championmicro.com.tw
EPA/80++ ZVS-Like PFC/PWM COMBO CONTROLLER
Design High Efficient Power Supply both Full Load Light Load
Vrms Description:
VRMS designed following functions: VRMS used detect Brown (Also, call brown out.). When VRMS less than +/-5%, PFCOUT will turned VEAO will softly discharged toward Volt. When VRMS greater than 1.25V +/-5%, PFCOUT enabled VEAO released. VRMS also used determine Line high line line. VRMS above 2.5V will recognize high line the. VRMS below 2.25V line. Between Vrms 2.25V, hysteresis. High Line Light Load, 380V 304V (Vfb threshold moves from 2.5V prohibited CM6802A/B 380V 342V (Vfb threshold moves from 2.5V 2.25V) prohibited CM6802AH/BH. Line Light Load, 380V 304V (Vfb threshold moves from 2.5V enable CM6802A/B 380V 342V (Vfb threshold moves from 2.5V 2.25V) enable CM6802AH/BH. provides ZVS-Like performance.
current loop compensation returned VREF produce soft-start characteristic PFC: reference voltage comes from zero volts, creates differentiated voltage IEAO which prevents from immediately demanding full duty cycle boost converter.
Brown (PFC Brown Comparator)
Brown comparator monitors Vrms (pin voltage inhibits error amplifier output, Veao pulled down during Vrms lower than threshold. this voltage Vrms less than nominal 1.25V. Once this voltage reaches 1.25V, which corresponds input around 88Vac. hysteresis comparator lower threshold After Brown conditions removed, system will initiate start sequence with proper soft start rate (pin
Cycle-By-Cycle Current Limiter Selecting RSENSE
ISENSE pin, well being part current feedback loop, direct input cycle-by-cycle current limiter section. Should input voltage this ever more negative than -1V, output will disabled until protection flip-flop reset clock pulse start next power cycle. sensing resistor boost converter. During steady state, line input current RSENSE Imul 7.75K. Since maximum output voltage gain modulator Imul 7.75K 0.8V during steady state, RSENSE line input current will limited below 0.8V well. When VEAO reaches maximum VEAO which Isense reach 0.8V. 100% load, VEAO should around 4.5V ISENSE average peak 0.6V. will provide optimal dynamic response tolerance components. Therefore, choose RSENSE, following equation: RSENSE RParasitic =0.6V Vinpeak Line Input power) example, minimum input voltage 80VAC, maximum input power 200Watt, RSENSE RParasitic (0.6V 1.414) 200) 0.169 ohm. designer needs consider parasitic resistance margin power supply dynamic response. Assume RParasitic mOhm, RSENSE mOhm.
Current Error Amplifier, IEAO
current error amplifier's output controls duty cycle keep average current through boost inductor linear function line voltage. inverting input current error amplifier, output current gain modulator summed with current which results from negative voltage being impressed upon ISENSE pin. negative voltage ISENSE represents currents flowing circuit, typically derived from current sense resistor series with negative terminal input bridge rectifier. higher power applications, current transformers sometimes used, monitor boost diode. stated above, inverting input current error amplifier virtual ground. Given this fact, arrangement duty cycle modulator polarities internal PFC, increase positive current from gain modulator will cause output stage increase duty cycle until voltage ISENSE adequately negative cancel this increased current. Similarly, gain modulator's output decreases, output duty cycle will decrease, achieve less negative voltage ISENSE pin.
CM6802A/B/AH/BH, comparator serves protect power circuit from being subjected excessive voltages load should suddenly change. resistor divider from high voltage output VFB. When voltage exceeds 2.85V, output driver shut down. section will continue operate. comparator 250mV hysteresis, will restart until voltage drops below 2.55V. power components CM6802A/B/AH/BH within their safe operating voltages, interfere with boost voltage regulation loop.
Error Amplifier Compensation
loading modeled negative resistor; increase input voltage causes decrease input current. This response dictates proper compensation transconductance error amplifiers. Figure shows types compensation networks most commonly used voltage current error amplifiers, along with their respective return points.
2009/11/02
Rev.
Champion Microelectronic Corporation
CM6802A/B/AH/BH (Dynamic Soft PFC/Green PWM)
http://www.championmicro.com.tw
EPA/80++ ZVS-Like PFC/PWM COMBO CONTROLLER
Design High Efficient Power Supply both Full Load Light Load
Voltage Loop
There major concerns when compensating voltage loop error amplifier, VEAO; stability transient response. Optimizing interaction between transient response stability requires that error amplifier's open-loop crossover frequency should that line frequency, 23Hz 47Hz line (lowest anticipated international power frequency). deviate from 2.5V (nominal) value. this happens, transconductance voltage error amplifier, will increase significantly, shown Typical Performance Characteristics. This raises gain-bandwidth product voltage loop, resulting much more rapid voltage loop response such perturbations than would occur with conventional linear gain characteristics. Voltage Loop Gain Current Loop Gain
VISENSE IEAO IEAO ISENSE DOFF VOUTDC 2.5V
ZCI: Compensation Work Current Loop GMI: Transconductance IEAO VOUTDC: Boost Output Voltage; typical designed value 380V worst condition calculate RSENSE: Sensing Resistor Boost Converter 2.5V: Amplitude Leading Edge Modulation Ramp(typical) Boost Inductor gain input voltage CM6802A/B/AH/BH's voltage error amplifier, VEAO specially shaped non-linearity such that under steady-state operating conditions transconductance error amplifier, local minimum. Rapid perturbation line load conditions will cause input voltage error amplifier (VFB) ISENSE Filter, filter between RSENSE ISENSE There purposes filter ISENSE pin:
VOUT VEAO VEAO VOUT 2.5V VOUTDC VEAO*
ZCV: Compensation Work Voltage Loop GMv: Transconductance VEAO PIN: Average Input Power VOUTDC: Boost Output Voltage; typical designed value 380V. CDC: Boost Output Capacitor
Protection: During start inrush current conditions, will have large voltage cross which sensing resistor boost converter. requires ISENSE Filter attenuate energy. reduce Boost Inductor: ISENSE Filter reduce Boost Inductor: ISENSE Filter also reduce Boost Inductor value since ISENSE Filter behaves like integrator before going ISENSE which input current error amplifier, IEAO. ISENSE Filter filter. resistor value ISENSE Filter between because IOFFSET resistor generate offset voltage IEAO. selecting RFILTER equal will keep offset IEAO less than 5mV. Usually, design pole ISENSE Filter fpfc/6=8.33Khz, sixth switching frequency. Therefore, boost inductor reduced times without disturbing stability. Therefore, capacitor ISENSE Filter, CFILTER, will around 381nF.
Current Loop
current transcondutance amplifier, GMi, IEAO compensation similar that voltage error amplifier, VEAO with exception choice crossover frequency. crossover frequency current amplifier should least times that voltage amplifier, prevent interaction with voltage loop. should also limited less than 1/6th that switching frequency, e.g. 8.33kHz 50kHz switching frequency.
2009/11/02
Rev.
Champion Microelectronic Corporation
CM6802A/B/AH/BH (Dynamic Soft PFC/Green PWM)
http://www.championmicro.com.tw
EPA/80++ ZVS-Like PFC/PWM COMBO CONTROLLER
Design High Efficient Power Supply both Full Load Light Load
VEAO
IEAO
2.5V VRMS ISENSE
Tri-Fault 0.5V -1.0V ISENSE 0.3V VEAO
GAIN MODULATOR Rmul RAMP
Rmul
2.85V
16.5V Zener
7.5V REFERENCE
VREF
ILIMIT
MPPFC MNPFC ZENER
Green
PFCCLK
RAMP1
Figure Section Block Diagram
2009/11/02
Rev.
Champion Microelectronic Corporation
CM6802A/B/AH/BH (Dynamic Soft PFC/Green PWM)
http://www.championmicro.com.tw
EPA/80++ ZVS-Like PFC/PWM COMBO CONTROLLER
Design High Efficient Power Supply both Full Load Light Load
Oscillator (RAMP1, called RTCT)
CM6802A/AH, fRTCT=4xfpwm=4xfpfc fRTCT=200Khz, fpwm=50Khz fpfc=50Khz when VEAO=0V, provides best performance application. CM6802B/BH, fRTCT=2xfpwm=4xfpfc fRTCT=200Khz, fpwm=100Khz fpfc=50Khz when VEAO=0V, provides best performance application. oscillator frequency, fRTCT similar formula CM6800: current-mode applications, ramp (RAMP2) usually derived directly from current sensing resistor current transformer primary output stage, thereby representative current flowing converter's output stage. DCILIMIT, which provides cycle-by-cycle current limiting, typically connected RAMP2 such applications. voltage-mode, operation certain specialized applications, RAMP2 connected separate timing network generate voltage ramp against which will compared. Under these conditions, voltage feed-forward from buss assist line regulation accuracy response. current mode operation, ILIMIT input used output stage over-current protection. voltage error amplifier included stage CM6802A/B/AH/BH, this function generally performed output side PWM's isolation boundary. facilitate design opto-coupler feedback circuitry, offset been built into PWM's RAMP2 input which allows command zero percent duty cycle input voltages below around 1.8V.
fRTCT
tRAMP tDEADTIME
dead time oscillator derived from following equation: tRAMP VREF 1.25 VREF 3.75 VREF 7.5V: tRAMP 0.51 dead time oscillator determined using: tDEADTIME
2.5V 4.216mA
Current Limit (DCILIMIT)
ILIMIT direct input cycle-by-cycle current limiter section. Should input voltage this ever exceed output flip-flop reset clock pulse start next power cycle. Beside, cycle-by-cycle current, when ILIMIT triggered cycle-by-cycle current. will limit duty cycle mode. Therefore, power dissipation will reduced during dead short condition. When DCILIMIT connected with RAMP2 pin, CM6802A/B/AH/BH's section becomes current mode controller. Sometimes, network between DCILIMIT RAMP2 resistor divider DCILIMIT's threshold amplified 1.5V higher easy layout purpose.
dead time small (tRAMP tDEADTIME that operating frequency typically approximately fRTCT
tRAMP
should greater than 470pF. 1000PF Solving yields 7.75K. Selecting standard components values, 1000pF, 7.75k dead time oscillator determined things: minimum time which dead time skipping reference duty cycle: when duty cycle less than dead time, next cycle will skipped reduces load consumption some applications.
Brown (380V-OK Comparator)
380V-OK comparator monitors output inhibits this voltage less than nominal 2.36V. Once this voltage reaches 2.36V, which corresponds output capacitor being charged rated boost voltage, soft-start begins. hysteresis comparator lower threshold 1.35V.
Section Pulse Width Modulator
section CM6802A/B/AH/BH straightforward, there several points which should noted. Foremost among these inherent synchronization section device, from which also derives basic timing. capable current-mode voltage-mode operation.
2009/11/02
Rev.
Champion Microelectronic Corporation
CM6802A/B/AH/BH (Dynamic Soft PFC/Green PWM)
http://www.championmicro.com.tw
EPA/80++ ZVS-Like PFC/PWM COMBO CONTROLLER
Design High Efficient Power Supply both Full Load Light Load
Control (RAMP2)
When section used current mode, RAMP2 generally used sampling point voltage representing current primary PWM's output transformer, derived either current sensing resistor current transformer. voltage mode, input ramp voltage generated second timing components (RRAMP2, CRAMP2),that will have minimum value zero volts should have peak value approximately voltage mode operation, feed-forward from output buss excellent derive timing ramp stage. filter network recommended between (pin bootstrap winding. resistor filter following. RFILTER IVCC IVCC (QPFCFET QPWMFET (typ.) anything goes wrong, goes beyond 19.4V, gate (pin drive goes gate drive (pin remains function. resistor's value must chosen meet operating current requirement CM6802A/B/AH/BH itself (5mA, max.) plus current required gate driver outputs. EXAMPLE: With wanting voltage called, VBIAS 18V, CM6802A/B/AH/BH driving total gate charge 90nC 100kHz (e.g. IRF840 MOSFET IRF820 MOSFET), gate driver current required IGATEDRIVE 100kHz 90nC RBIAS RBIAS
Soft Start (SS)
Start-up controlled selection external capacitor current source supplies charging current capacitor, start-up begins SS~1.4V. Start-up delay programmed following equation: tDELAY
1.8V
where required soft start capacitance, tDEALY desired start-up delay. important that time constant soft-start allow time generate sufficient output power section. start-up delay should least 5ms. Solving minimum value CSS:
VBIAS
Choose RBIAS CM6802A/B/AH/BH should locally bypassed with ceramic capacitor. most applications, electrolytic capacitor between also required across part, both filtering part start-up bootstrap circuitry.
27nF 1.8V
Caution should exercised when using this minimum soft start capacitance value because premature charging capacitor activation section result hysteresis band 380V-OK comparator start-up. magnitude start-up related both line voltage nominal output voltage. Typically, 0.05 soft start capacitor will allow time reach their nominal values prior activation section line voltages between 90Vrms 265Vrms.
Leading/Trailing Modulation
Conventional Pulse Width Modulation (PWM) techniques employ trailing edge modulation which switch will turn right after trailing edge system clock. error amplifier output then compared with modulating ramp effective duty cycle trailing edge modulation determined during time switch. Figure shows typical trailing edge control scheme.
Generating
After turning CM6802A/B/AH/BH 13V, operating voltage vary from 17.9V. That's ways generate VCC. auxiliary power supply around 15V, other bootstrap winding self-bias CM6802A/B/AH/BH system. bootstrap winding either taped from boost choke from transformer stage. ratio winding transformer bootstrap should between 15V.
2009/11/02
Rev.
Champion Microelectronic Corporation
CM6802A/B/AH/BH (Dynamic Soft PFC/Green PWM)
http://www.championmicro.com.tw
EPA/80++ ZVS-Like PFC/PWM COMBO CONTROLLER
Design High Efficient Power Supply both Full Load Light Load
case leading edge modulation, switch turned right leading edge system clock. When modulating ramp reaches level error amplifier output voltage, switch will turned effective duty-cycle leading edge modulation determined during time switch. Figure shows leading edge control scheme. advantages this control technique that required only system clock. Switch 1(SW1) turns switch (SW2) turns same instant minimize momentary "no-load" period, thus lowering ripple voltage generated switching action. With such synchronized switching, ripple voltage first stage reduced. Calculation evaluation have shown that 120Hz component PFC's output ripple voltage reduced much using this method.
2009/11/02
Rev.
Champion Microelectronic Corporation
CM6802A/B/AH/BH (Dynamic Soft PFC/Green PWM)
http://www.championmicro.com.tw
EPA/80++ ZVS-Like PFC/PWM COMBO CONTROLLER
Design High Efficient Power Supply both Full Load Light Load
CM6802A/B/AH/BH APPLICATION CIRCUIT (Voltage Mode)
GBL408
IN5406 0.22 2W(s) IN5406 2W(s) 1uF/400V
380VDC
VEAO
0.47uF/16V
0.047uF
0.47uF 0.47uF 30.1K 36.5K
1N4148
2N2222
470pF
VREF
RAMP2
2N2907
470pF 1000pF 2.49K
ISO1A
817C
380VDC BYV-26EGP BYV-26EGP 1000PF 55Ts 20N60
12TS ERL-35
R5*25
2200uF/6.3V 4.75K 1/8W
EI10 PC40
20N60
2200uF/10V
0.2/2W(S)
2009/11/02
Rev.
Champion Microelectronic Corporation
Circuit
INLET
22uF/25V
3M1%
1N5406
0.1uf/25v
ISENSE
0.47UF 243K APS27950
8A/600V
200K
20N60
1000pF
Vrms
MPS751
150uF/450V
4700pF
IEAO
470pF/250V
RAMP1
DCIlim
VREF
820pF 2200PF 0.1uF 470pF 0.047uF
+12V
1000PF
10.2K
ISO1A
817C
(SPARE) ERL-35 1000PF
+12V 28TS
R5*25
4.7K 2200uF/16V
0.1uF
2200uF/16V
39.2K
2200PF
30L30
TL431
CM6802A/B/AH/BH (Dynamic Soft PFC/Green PWM)
http://www.championmicro.com.tw
EPA/80++ ZVS-Like PFC/PWM COMBO CONTROLLER
Design High Efficient Power Supply both Full Load Light Load
CM6802A/B/AH/BH APPLICATION CIRCUIT (Current Mode)
GBL408
IN5406 0.22 2W(s) IN5406 2W(s) 1uF/400V
380VDC
VEAO
0.47uF/16V
0.047uF
0.47uF 1000pF 0.47uF 36.5K
1N4148
2N2222
470pF
VREF
RAMP2
30.1K 2N2907
470pF 1000pF 2.49K
ISO1A
817C
380VDC BYV-26EGP BYV-26EGP 1000PF 55Ts 20N60
12TS ERL-35
R5*25
2200uF/6.3V 4.75K 1/8W
EI10 PC40
20N60
2200uF/10V
0.2/2W(S)
2009/11/02
Rev.
Champion Microelectronic Corporation
Circuit
INLET
3M1%
1N5406
22uF/25V
0.1uf/25v
ISENSE
0.47UF 243K APS27950
8A/600V
200K
20N60
Vrms
150uF/450V
4700pF
IEAO
MPS751
470pF/250V
RAMP1
DCIlim
VREF
470pF
0.1uF
0.047uF
820pF
2200PF
+12V
1000PF
10.2K
ISO1A
817C
(SPARE) ERL-35 1000PF
+12V 28TS
R5*25
4.7K 2200uF/16V
0.1uF
2200uF/16V
39.2K
2200PF
30L30
TL431
CM6802A/B/AH/BH (Dynamic Soft PFC/Green PWM)
http://www.championmicro.com.tw
EPA/80++ ZVS-Like PFC/PWM COMBO CONTROLLER
Design High Efficient Power Supply both Full Load Light Load
PACKAGE DIMENSION
16-PIN (S16)
16-PIN PDIP (P16)
2009/11/02
Rev.
Champion Microelectronic Corporation
CM6802A/B/AH/BH (Dynamic Soft PFC/Green PWM)
http://www.championmicro.com.tw
EPA/80++ ZVS-Like PFC/PWM COMBO CONTROLLER
Design High Efficient Power Supply both Full Load Light Load
IMPORTANT NOTICE
Champion Microelectronic Corporation (CMC) reserves right make changes products discontinue integrated circuit product service without notice, advises customers obtain latest version relevant information verify, before placing orders, that information being relied current. applications using integrated circuit products involve potential risks death, personal injury, severe property environmental damage. integrated circuit products designed, intended, authorized, warranted suitable life-support applications, devices systems other critical applications. products such applications understood fully risk customer. order minimize risks associated with customer's applications, customer should provide adequate design operating safeguards.
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Park Avenue Science-Based Industrial Park, HsinChu City, Taiwan +886-3-567 9979 +886-3-567 9909 http://www.champion-micro.com
Sales Marketing
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2009/11/02
Rev.
Champion Microelectronic Corporation
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