10-PIN Green-Mode PFC/PWM Combo CONTROLLER CM6805A Green-Mode PFC

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10-PIN Green-Mode PFC/PWM Combo CONTROLLER CM6805A Green-Mode PFC

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CM6805A
10-PIN Green-Mode PFC/PWM Combo CONTROLLER
CM6805A Green-Mode PFC/PWM Combo controller Desktop High Density Adapter. power supply, it's input current shaping performance could very close performance CM6800 ML4800 leading edge modulation average current topology. CM6805A offers smaller, lower cost bulk capacitors, reduces power line loading stress switching FETs, results power supply fully compliant IEC1000-3-2 specifications. CM6805A includes circuits implementation leading edge modulation, input current shaping technique "boost" type trailing edge modulation current, PWM. CM6805A's operate same frequency, 67.5kHz. comparator shuts down section event sudden decrease load. section also includes peak current limiting enhanced system reliability. PFCOFFB which brown application determine GMth turn PFC.
FEATURES
10-Pin SOIC package. around Mega pin. Easy configure into Boost Follower. Enable lowest power supply with PFC. Internally synchronized Patented slew rate enhanced voltage error amplifier with advanced input current shaping technique. Universal Line Input Voltage boost boost with leading edge modulation Technique. Feed forward automatic slope compensation. PFCOVP, Precision ILIMIT, Tri-Fault Detect comparator meet UL1950 supply currents; leading start-up: 100uA trailing typical, edge operating current: typical. Synchronized modulation reduce ripple current storage capacitor between sections reduce switching noise system VIN-OK Comparator guarantee enable when reach steady state High efficiency trailing-edge current mode Exact maximum duty cycle UVLO, REFOK, brownout protection Digital soft start, ~10mS Precision 1.5V current limit current mode operation PFCOFFB sense light load turn PFCOFFB sense Input voltage Brown using Input Current Shaping
2007/11/28
Champion Microelectronic Corporation
Page
CM6805A
10-PIN Green-Mode PFC/PWM Combo CONTROLLER
APPLICATIONS
Desktop Adaptor Open Frame
CONFIGURATION
SSOP (R10) View
DESCRIPTION
Symbol Ground Feedforward input slope compensation start system. During start connected until greater than 13V. Current sense input current limit comparator transconductance voltage error amplifier output transconductance voltage error amplifier input feed back current limit comparator input PFCOFFB; turn stage when below Positive supply driver output driver output Description Min. Operating Voltage Typ. Max. Unit
ISENSE VEAO PFCOFFB
ORDERING INFORMATION
Part Number Operation Frequency Initial Accuracy (KHz) CM6805AGIR Fpwm Fpfc 67.5Khz 67.5 SSOP(R10) Temperature Range Package
Note: Suffix Free Product 2.Initial Accuracy TA=25
2007/11/28
Champion Microelectronic Corporation
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CM6805A
10-PIN Green-Mode PFC/PWM Combo CONTROLLER
BLOCK DIAGRAM
.VEAO
400K
ISENSE
100K
VREFDK
2.5V
PFCOUT
Ramp UVLO FAULT
BROKENWIRE
0.5V PFCCLK
fpfc=67.5KHz
2.75V 2.5V 2.25V 1.1V
PWMCLK
VIN-OK
VREFDK
PWMOUT
ILIMIT
PFCOFFB
5.5V
SHUTDOWN
PWMCLK
10mS
1.5V
SOFT START
PROTECTED PATENT
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum ratings those values beyond which device could permanently damaged. Parameter Min. Max. (before start (after start ISENSE Voltage VEAO PFCOFFB Voltage Other Current (Average) 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) GND-0.3 GND-0.3 GND-0.3 Units
2007/11/28
Champion Microelectronic Corporation
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CM6805A
10-PIN Green-Mode PFC/PWM Combo CONTROLLER
ELECTRICAL CHARACTERISTICS
TA=Operating Temperature Range (Note
Unless otherwise stated, these specifications apply Vcc=+14V,
Symbol
Parameter
Test Conditions Voltage Error Amplifier (GMv)
CM6805A Min. Typ. Max. -0.5 2.55 -1.0
Unit
Input Voltage Range Transconductance Feedback Reference Voltage Input Bias Current Output High Voltage Output Voltage Sink Current Source Current Open Loop Gain Power Supply Rejection Ratio 16.5V Input Impedance (CM6805A) ISENSE TA=25 Comparator Threshold Voltage Hysteresis ILIMIT Comparator Threshold Voltage Delay Output Comparator Threshold Voltage (CM6805A) Hysteresis Digital Soft Start Digital Soft Start Timer (Note Right After Start Comparator Threshold Voltage Delay Output (Note Threshold Voltage During soft start condition Fault Detect HIGH Time Fault Detect HIGH Fault Detect VFB=VFAULT DETECT OPEN, 470pF from Tri-fault Normal operation without soft start VEAO 1.5V, VEAO 1.5V Note VNONINV VINV, VEAO 3.75V
2.44
2.64
2.77
2.85
-1.05
-0.95
2.16 1.13
2.26 1.17
2.36 1.21
1.38
1.62
2.70
2.77
2.85
2007/11/28
Champion Microelectronic Corporation
Page
CM6805A
10-PIN Green-Mode PFC/PWM Combo CONTROLLER
ELECTRICAL CHARACTERISTICS
TA=Operating Temperature Range (Note
Unless otherwise stated, these specifications apply Vcc=+14V,
Symbol
Parameter
Test Conditions PFCOFFB
CM6805A Min. 4.75 Typ. Max. 5.25
Unit
PFCOFFB Threshold PFCOFFB Hysteresis
PFCOFFB
Frequency Voltage Stability Temperature Stability Total Variation Dead Time (Note Minimum Duty Cycle Maximum Duty Cycle Output Rdson Output Voltage Output High Rdson Output High Voltage Rise/Fall Time (Note IOUT 100mA, 1000pF Duty Cycle Range Output Rdson Output Voltage Output High Rdson (Note Output High Voltage Rise/Fall Time (Note room temp IOUT -100mA IOUT -10mA, room temp IOUT 100mA, 1000pF Supply Start-Up Current Operating Current Under voltage Lockout Threshold Under voltage Lockout Hysteresis 11V, 15V, 12.35 13.65 13.5 49.5 14.2 22.5 13.5 IOUT -100mA IOUT -10mA, IAC=100uA,VFB=2.55V, ISENSE IAC=0uA,VFB=2.0V, ISENSE 14.2 22.5 Line, Temp (CM6805A) 67.5 0.45 0.65
Note Limits guaranteed 100% testing, sampling, correlation with worst-case test conditions. Note Guaranteed design, 100% production test.
2007/11/28
Champion Microelectronic Corporation
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CM6805A
10-PIN Green-Mode PFC/PWM Combo CONTROLLER
TYPICAL PERFORMANCE CHARACTERISTIC
Transconductance (umho)
Voltage Error Amplifier (GMv) Transconductance
2007/11/28
Champion Microelectronic Corporation
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CM6805A
10-PIN Green-Mode PFC/PWM Combo CONTROLLER
Functional Description
CM6805A consists ICST (Input Current Shaping Technique), (Continuous Conduction Mode) (Discontinuous Conduction Mode) boost (Power Factor Correction) front synchronized (Pulse Width Modulator) back end. CM6805A designed replace FAN4803 package), which second generation ML4803 with package. distinguished from earlier combo controllers count, innovative input current shaping technique, very start-up operating currents. section dedicated peak current mode operation. uses conventional trailing-edge modulation, while uses leading-edge modulation. This patented Leading Edge/Trailing Edge (LETE) modulation technique helps minimize ripple current capacitor. main improvements from ML4803 are: Green Mode Functions both Remove error amplifier back slew rate enhancement GMv, which using voltage input instead current input. This transconductance amplifier will increase transient response times from conventional comparator Tri-Fault Detect UL1950 compliance enhanced safety feed forward signal from added automatic slope compensation. This increases signal noise ratio during light load; therefore, improved light load high input line voltage. CM6805A does require bleed resistor uses more than 800k resistor between rectified line voltage feed initial current before chip wakes VIN-OK comparator added guaranteed cannot turn until reaches 2.5V which boost output about steady state, typical 380V. 10mS digital soft start circuit added package internal Zener VCCOVP comparator CM6805A operates both sections 67.5kHz. This allows smaller magnetic output filter components, while minimizing switching losses stage. Several protection features have been built into CM6805A. These include soft-start, redundant over voltage protection, Tri-Fault Detect, VIN-OK, peak current limiting, duty cycle limiting, under-voltage lockout, reference comparator PFCOFFB. Detailed Descriptions (Pin Typically, feed-forward resistor, RAC, 4Mega~10Mega resistor connected between this rectified line input voltage. current will program automatic slope compensation system. This feed-forward signal increase signal noise ratio light load condition high input line voltage condition. ISENSE (Pin This ties resistor which senses input current. This signal should negative with respect ground. internally feeds pulse-by-pulse current limit comparator current sense feedback signal. ILIMIT trip level -1V. ISENSE feedback internally multiplied gain four compared against internal programmed ramp duty cycle. intersection boost inductor current down-slope with internal programming ramp determines boost off-time. requires filter between ISENSE boost sensing resistor. VEAO (Pin This slew rate enhanced transconductance amplifier output which needs connected with compensation network Ground. (Pin Besides this slew rate enhanced transconductance input, also couple protection comparators, PFCOVP, Tri-Fault Detect (Pin This tied primary side current sense resistor transformer. provides internal pulse-by-pulse current limit stage (which occurs 1.5V) peak current mode feedback path current mode control stage. Besides current information, photo-couple also goes into pin. Therefore, Amplifier input. Soft Start around 10mS after startup(VCC greater than 13V).
2007/11/28
Champion Microelectronic Corporation
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CM6805A
10-PIN Green-Mode PFC/PWM Combo CONTROLLER
PFCOFFB (Pin When this below gate drive, PFCOUT will turned until PFCOFFB greater than 5.5V. When PFCOFFB below Veao also been pulled well. PFCOFFB usually used Brown Green PWM. Brown out, PFCOFFB used sense bridge input voltage. Green PWM, used sense photo couple current detect load. When load light, photo couple current increased. photo couple current with resistor between PFCOFFB sense light load condition. When PFCOFFB below turned off. (Pin power input connection start-up current 100uA. no-load current 2mA. quiescent current will include both biasing currents output currents. Given operating frequency MOSFET gate charge (Qg), average output currents calculated IOUT average magnetizing current required gate drive transformers must also included. also assumed proportional output voltage. also ties internally UVLO circuitry VREFOK comparator, enabling disabling 10V. must bypassed with high quality ceramic bypass capacitor placed close possible Good bypassing critical proper operation CM6805A. typically produced additional winding boost inductor Choke, providing voltage that proportional output voltage. external clamp, such shown Figure desirable proposed limit over voltage acceptable value. PFCOUT (Pin (Pin high-current power driver capable directly driving gate power MOSFET with peak currents +0.5A. Both outputs actively held when below UVLO threshold level which VREFOK comparator low. 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 CM6805A 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 draws from power line matches instantaneous line voltage. these conditions that output voltage boost converter must higher than peak value line voltage. commonly used value 385VFB, allow high line 270VACrms. other condition that current that converter allowed draw from line given instant must proportional line voltage.
5248
Figure1 Optional Clamp
This limits maximum that applied about avoid which allowing maximum rating. filter required between boost trap winding VCC.
2007/11/28
Champion Microelectronic Corporation
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CM6805A
10-PIN Green-Mode PFC/PWM Combo CONTROLLER
Control: Leading Edge Modulation with Input Current Shaping Technique (I.C.S.T.) only differences between conventional control topology I.C.S.T. current loop conventional control method close loop method requires detail understanding about system loop gain design. With I.C.S.T., since current loop open loop, very straightforward implement result system, power supply like pure resistor frequency. Therefore, current phase with voltage. conventional control, forces input current follow input voltage. CM6805A, chip thinks boost converter needs behave like frequency resistor, what duty cycle should following equations CM6805A achieve: Therefore, equation becomes:
toff
Combine equation equation (5), get:
Vout
Vout
Vout toff
From this simple equation (8), implement control section CM6805A 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. When modulating ramp reaches level error amplifier output voltage, switch will turned OFF. When switch inductor current will ramp effective duty cycle trailing edge modulation determined during time switch. Figure shows typical trailing edge control scheme. 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.
Equation means: average boost inductor current equals input current.
Vout
Therefore, input instantaneous power about equal output instantaneous power. steady state each phase angle, boost converter equation continuous conduction mode
Vout
Rearrange above equations, (1), (2),(3), term Vout boost converter duty cycle average boost diode current equation (5):
Vout
Also, average diode current expressed
Toff
value boost inductor large enough, assume
means during each cycle
during sampling, diode current constant.
2007/11/28
Champion Microelectronic Corporation
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CM6805A
10-PIN Green-Mode PFC/PWM Combo CONTROLLER
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, substantially reducing dissipation high-voltage capacitor. ZCV: Compensation Work Voltage Loop GMv: Transconductance VEAO PIN: Average Input Power VOUTDC: Boost Output Voltage; typical designed value 380V. CDC: Boost Output Capacitor VEAO: This necessary change VEAO deliver designed average input power. average value 6V-3V=3V since when input line voltage increases, delta VEAO will reduced deliver same output. over compensate, choose delta VEAO Internal Voltage Ramp internal ramp current source programmed VEAO voltage. When VEAO increases ramp current source also increase. This current source used develop internal ramp charging internal 30pF +12/ -10% capacitor. frequency internal programming ramp internally 67.5kHz. Design ISENSE Filtering ISENSE Filter, filter between ISENSE: There purposes filter ISENSE pin: 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 also reduce Boost Inductor value since ISENSE Filter behaves like integrator before going ISENSE which input current error amplifier, IEAO.
Typical Applications
Section: Voltage Loop Error Amp, VEAO ML4803 utilizes voltage error amplifier section (VEAO). CM6805A, using slew rate enhanced transconductance amplifier, which same error amplifier CM6800. unique transconductance profile speed conventional transient response times. internal reference VEAO 2.5V. input VEAO pin. Voltage Loop Compensation voltage-loop bandwidth must less than 120Hz limit amount line current harmonic distortion. typical crossover frequency 30Hz. Voltage Loop Gain
VOUT VEAO VEAO VOUT 2.5V VOUTDC VEAO
2007/11/28
Champion Microelectronic Corporation
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CM6805A
10-PIN Green-Mode PFC/PWM Combo CONTROLLER
ISENSE Filter filter. resistor value ISENSE Filter between ohm. selecting RFILTER equal will keep offset IEAO less than 5mV. Usually, design pole ISENSE Filter fpfc/6, sixth switching frequency. Therefore, boost inductor reduced times without disturbing stability. Therefore, capacitor ISENSE Filter, CFILTER, will around 283nF. IAC, RAC, Automatic Slope Compensation, high line light load, Startup current There purposes pin: leading edge modulation, when duty cycle less than 50%, requires similar slope compensation, duty cycle trailing edge modulation greater than 50%. CM6805A, relatively easy thing design. more than 800K resistor, connect rectified line voltage. will automatic slope compensation. input boost inductor small, need reduced more. During startup period, also provides initial startup current, 100uA;therefore, bleed resistor needed. Since with behaves feedforward signal, also enhances signal noise ratio input current. also will keep maximum input power constant. However, maximum input power will still when input line voltage goes Start system, UVLO, VREFOK Soft Start During Start-up period, resistor will provide start current~100uA from rectified line voltage pin. During Start soft start function triggered duration soft start will last around 10mS. section wakes after Start period After Start period, section will softly start since VEAO zero before start-up period. Since VEAO slew rate enhanced transconductance amplifier (see figure VEAO high impedance output like current source will slowly charge compensation work which needs designed using voltage loop gain equation. Before boost output reaches design voltage, around 380V reaches 2.5V, section off. section wakes after reaches steady state section time before reaches 2.25V. Then internal 10mS digital soft start circuit slowly ramps soft-start voltage. Comparator Comparator sense which same voltage loop input. good thing compensation network connected VEAO. function relative fast OVP. like conventional error amplifier which operational amplifier requires local feedback make action becomes very slow. threshold 2.5V+10% =2.75V with 250mV hysteresis. Tri-Fault Detect Comparator improve power supply reliability, reduce system component count, simplify compliance UL1950 safety standards, CM6805A includes Tri-Fault Detect. This feature monitors (Pin certain fault conditions. case feedback path failure, output could safe operating limits. With such failure, will outside normal operating area. Should low, high, open, Tri-Fault Detect senses error terminates output drive. Tri-Fault detect entirely internal circuit. requires external components serve protective function. over voltage generate CM6805A system, generated from source that proportional output voltage. will avoid over voltage. Given that corresponds 380V output, 17.6V corresponds acceptable level 18V. Typically, there bootstrap winding boost inductor. isn't built function. maximum rating, external zener clamp desirable proposed limit over voltage. necessary filter between bootstrap winding VCC. VCC=15V, sufficient drive either power MOSFET IGBT.
2007/11/28
Champion Microelectronic Corporation
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CM6805A
10-PIN Green-Mode PFC/PWM Combo CONTROLLER
UVLO UVLO threshold providing hysteresis. PFCOUT PWMOUT Both PFCOUT PWMOUT CMOS drivers. They both have adaptive anti-shoot through reduce switching loss. pull-up 30ohm PMOS driver pull-down 15ohm NMOS driver. source 0.5A sink above 15V. Section After 10mS digital soft start, CM6805A's operating typical current mode. requires secondary feedback, typically, configured with CM431, photo couple. Since Section different from CM6800 family, needs emitter photo couple connected with instead collector. current information also goes into V+I. Usually, current information requires filter before goes into Therefore, actually summing node from voltage information which from photo couple CM431 current information which from sensing resistor signal goes through single pole, filter then enter pin. This filter also serves several functions: protects provides level shift voltage information. filters switching noise from current information.
normal operation, threshold voltage 1.5V. When greater than 1.5V, output driver will turn Power MOSFET. When Soft Start triggered, threshold around 150mV. Soft Start triggered following conditions: During startup (VCC less than 10V) below 1.1V During above conditions, threshold around 150mV until conditions have been removed. After above conditions have been removed, internal Soft Start will ramp voltage from ~150mV Each Soft Start Ramp last around 10mS. Component Reduction Components associated with VRMS IEAO pins typical controller such CM6800 have been eliminated. power limit bandwidth does vary with line voltage.
2007/11/28
Champion Microelectronic Corporation
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CM6805A
10-PIN Green-Mode PFC/PWM Combo CONTROLLER
Application Circuit Power)
GBU808
IN5406 0.08 2W(s) IN5406 0.47uF/400V
380VDC 4.7uF
1N4148 1N4148
380VDC
20A/100V +12V 09N90 2200uF/16V 1000PF 30A/60V
2200uF/10V
2200uF/6.3V 4.75K 1/8W
09N90
CM6805AG Marking Rule
2007/11/28
Champion Microelectronic Corporation
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INLET
1N5406 T106-75 280K
380VDC ER806
CM6805A
SR160
SR160 1/2W SR140 1N4148 470pF/250V 14N50
102pF
180uF/450V
SR140
Isense
VEAO
PFCOFFB
9.5V
104pF
ISO1A
330K 104pF 474pF 473pF 472pF 470pF
+12V
1000PF
10.2K
ISO1A 817C
4.7K 2200uF/16V
0.1uF
39.2K
2200PF
TL431
1000PF
CM6805A
10-PIN Green-Mode PFC/PWM Combo CONTROLLER
PACKAGE DIMENSION
Pin-SSOP (R10)
NUMBERING SCHEME
Ordering Number: CM6805AGXY (note1)
note1: Suffix Temperature Range (note Suffix Package Type (note note2: Suffix Free Product note -40~+125 note SSOP-10
2007/11/28
Champion Microelectronic Corporation
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CM6805A
10-PIN Green-Mode PFC/PWM Combo CONTROLLER
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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Champion Microelectronic Corporation
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10-PIN Green-Mode PFC/PWM Combo CONTROLLER CM6805A Green-Mode PFC

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