MC34023 series high speed, fixed frequency, single-ended pulse width m
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MC34023, MC33023 High Speed Single-Ended Controller
MC34023 series high speed, fixed frequency, single-ended pulse width modulator controllers optimized high frequency operation. They specifically designed Off-Line DC-to-DC converter applications offering designer cost-effective solution with minimal external components. These integrated circuits feature oscillator, temperature compensated reference, wide bandwidth error amplifier, high speed current sensing comparator, high current totem pole output ideally suited driving power MOSFET. Also included protective features consisting input reference undervoltage lockouts each with hysteresis, cycle-by-cycle current limiting, latch single pulse metering. flexibility this series allows easily configured either current mode voltage mode control. Propagation Delay Output High Current Totem Pole Output Wide Bandwidth Error Amplifier Fully-Latched Logic with Double Pulse Suppression Latching Cycle-By-Cycle Current Limiting Soft-Start Control with Latched Overcurrent Reset Input Undervoltage Lockout with Hysteresis Start-Up Current (500 Typ) Internally Trimmed Reference with Undervoltage Lockout Maximum Duty Cycle (Externally Adjustable) Precision Trimmed Oscillator Voltage Current Mode Operation Functionally Similar UC3823
Latching Oscillator Error Output Power Ground
PDIP-16 SUFFIX CASE SO-16W SUFFIX CASE 751G MC33023DW AWLYYWW Assembly Location Wafer Year Work Week MC34023P AWLYYWW
CONNECTIONS
Error Inverting Input Error Noninverting Input Error Output Clock Ramp Soft-Start (Top View) Vref Output Power Ground Current Limit Reference Ground Current Limit/ Shutdown
Vref Clock
5.1V Reference UVLO
Ramp Error Output Noninverting Input Inverting Input Soft-Start
ORDERING INFORMATION
Device MC33023DW Package SO-16W SO-16W PDIP-16 Shipping Units/Rail 1000 Tape Reel Units/Rail
Soft-Start Ground Current Limit Current Limit/ Shutdown
MC33023DWR2 MC34023P
This device contains active transistors.
Figure Simplified Application
Semiconductor Components Industries, LLC, 2001
May, 2001 Rev.
Publication Order Number: MC34023/D
MC34023, MC33023
MAXIMUM RATINGS
Rating Power Supply Voltage Output Driver Supply Voltage Output Current, Source Sink (Note Pulsed (0.5 Current Sense, Soft-Start, Ramp, Error Inputs Error Output Soft-Start Sink Current Clock Output Current Power Dissipation Thermal Characteristics SO-16L Package (Case 751G) Maximum Power Dissipation +25°C Thermal Resistance, Junction-to-Air Package (Case 648) Maximum Power Dissipation +25°C Thermal Resistance, Junction-to-Air Operating Junction Temperature Operating Ambient Temperature (Note MC34023 MC33023 Storage Temperature Range Symbol -0.3 +7.0 Value Unit
Tstg
1.25 +150 +105 +150
°C/W °C/W
ELECTRICAL CHARACTERISTICS (VCC 3.65 typical values +25°C, min/max values
operating ambient temperature range that applies [Note unless otherwise noted.) Characteristic REFERENCE SECTION Reference Output Voltage +25°C) Line Regulation (VCC Load Regulation Temperature Stability Total Output Variation over Line, Load, Temperature Output Noise Voltage kHz, +25°C) Long Term Stability +125°C 1000 Hours) Output Short Circuit Current OSCILLATOR SECTION Frequency +25°C Line (VCC Temperature Tlow Thigh) Frequency Change with Voltage (VCC Frequency Change with Temperature Tlow Thigh) Sawtooth Peak Voltage Sawtooth Valley Voltage Clock Output Voltage High State State fosc fosc/V fosc/T VOSC(P) VOSC(V) 1.25 Vref Regline Regload Vref 5.05 4.95 5.15 5.25 -100 mV/°C Symbol Unit
Maximum package power dissipation limits must observed. duty cycle pulse techniques used during test maintain junction temperature close ambient possible. Tlow MC34023 Thigh +70°C MC34023 -40°C MC33023 +105°C MC33023
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ELECTRICAL CHARACTERISTICS (VCC 3.65 typical values +25°C, min/max values
operating ambient temperature range that applies [Note unless otherwise noted.) Characteristic ERROR AMPLIFIER SECTION Input Offset Voltage Input Bias Current Input Offset Current Open-Loop Voltage Gain Gain Bandwidth Product +25°C) Common Mode Rejection Ratio (VCM Power Supply Rejection Ratio (VCC Output Current, Source Output Current, Sink Output Voltage Swing, High State -0.5 Output Voltage Swing, State Slew Rate COMPARATOR SECTION Ramp Input Bias Current Duty Cycle, Maximum Duty Cycle, Minimum Zero Duty Cycle Threshold Voltage 3(4) (Pin 7(9) Propagation Delay (Ramp Input Output, +25°C) SOFT-START SECTION Charge Current (VSoft-Start Discharge Current (VSoft-Start CURRENT SENSE SECTION Input Bias Current (Pin 9(12) Current Limit Comparator Input Offset Voltage (Pin 11(14) Current Limit Reference Input Common Mode Range (Pin 11(14)) Shutdown Comparator Threshold Propagation Delay (Current Limit/Shutdown Output, +25°C) OUTPUT SECTION Output Voltage State (ISink (ISink High State (ISource (ISource Output Voltage with UVLO Activated (VCC ISink Output Leakage Current Output Voltage Rise Time +25°C) Output Voltage Fall Time +25°C) UNDERVOLTAGE LOCKOUT SECTION Start-Up Threshold (VCC Increasing) UVLO Hysteresis Voltage (VCC Decreasing After Turn-On) TOTAL DEVICE Power Supply Current Start-Up (VCC Operating Vth(on) VOL(UVLO) 0.25 13.5 0.25 VCMR tPLH(in/out) 1.25 1.40 1.25 1.55 Ichg Idischg DC(max) DC(min) tPLH(in/out) -0.5 1.25 -5.0 AVOL CMRR PSRR ISource ISink 4.75 V/µs Symbol Unit
duty cycle pulse techniques used during test maintain junction temperature close ambient possible. Thigh +70°C MC34023 Tlow MC34023 -40°C MC33023 +105°C MC33023
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TIMING RESISTOR osc, OSCILLATOR FREQUENCY (kHz) +25°C 1200 1000
1000 fosc, OSCILLATOR FREQUENCY (Hz)
AMBIENT TEMPERATURE (°C)
Figure Timing Resistor versus Oscillator Frequency
Figure Oscillator Frequency versus Temperature
VOL, OPEN LOOP VOLTAGE GAIN (dB)
FREQUENCY (Hz) Phase Gain
1.30 EXCESS PHASE (°C) VTH, ZERO DUTY CYCLE 1.28 1.26 1.24 1.22 1.20
7(9)
AMBIENT TEMPERATURE (°C)
Figure Error Open Loop Gain Phase versus Frequency
Figure Comparator Zero Duty Cycle Threshold Voltage versus Temperature
2.55
2.45 µs/DIV
µs/DIV
Figure Error Small Signal Transient Response
Figure Error Large Signal Transient Response
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Vref REFERENCE VOLTAGE CHANGE (mV) 55°C +125°C +25°C REFERENCE SHORT CIRCUIT CURRENT (mA) 65.6 65.2 64.8 64.4
ISource, SOURCE CURRENT (mA)
AMBIENT TEMPERATURE (°C)
Figure Reference Voltage Change versus Source Current
Figure Reference Short Circuit Current versus Temperature
mV/DIV
Vref LINE REGULATION (2.0 ms/DIV)
mV/DIV
Vref LOAD REGULATION (2.0 ms/DIV)
Figure Reference Line Regulation
Figure Reference Load Regulation
VIO, CURRENT LIMIT INPUT OFFSET VOLTAGE (mV)
11(14) Vth, THRESHOLD VOLTAGE
1.50 1.46 1.42 1.38 1.34 1.30
AMBIENT TEMPERATURE (°C)
AMBIENT TEMPERATURE (°C)
Figure Current Limit Comparator Input Offset Voltage versus Temperature
Figure Shutdown Comparator Threshold Voltage versus Temperature
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MC34023, MC33023
SOFT START CHARGE CURRENT Vsat OUTPUT SATURATION VOLTAGE AMBIENT TEMPERATURE (°C) Source Saturation (Load Ground)
Pulsed Load Rate 25°C Ground
Sink Saturation (Load VCC)
OUTPUT LOAD CURRENT
Figure Soft-Start Charge Current versus Temperature
Figure Output Saturation Voltage versus Load Current
OUTPUT RISE FALL TIME LOAD ns/DIV
OUTPUT RISE FALL TIME LOAD ns/DIV
Figure Drive Output Rise Fall Time
Figure Drive Output Rise Fall Time
SUPPLY CURRENT (mA) Decreasing Increasing 3.65
VCC, SUPPLY VOLTAGE
Figure Supply Voltage versus Supply Current
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MC34023, MC33023
Vref Clock
Oscillator
Reference Regulator Vref UVLO
UVLO Output Power Ground Current Limit
Ramp Error Output Noninverting Input Inverting Input Soft-Start
Comparator
1.25 Error
Latch Current Limit Reference Soft-Start Latch Shutdown Current Limit/Shutdown
Ground
Figure Representative Block Diagram
Clock Soft-Start Error Output Ramp
Comparator
Output
Figure Current Limit Operating Waveforms
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MC34023, MC33023
OPERATING DESCRIPTION MC33023 MC34023 series high speed, fixed frequency, single-ended pulse width modulator controllers optimized high frequency operation. They specifically designed Off-Line DC-to-DC converter applications offering designer cost effective solution with minimal external components. representative block diagram shown Figure
Oscillator
output error amplifier less than normal output voltage, thus limiting duty cycle. time takes capacitor reach full charge given
(4.5 Soft-Start
oscillator frequency programmed values selected timing components temperature compensated selecting value charge current through current mirror timing capacitor This charge current runs continuously through discharge current ratioed times charge current, which yields maximum duty cycle 90%. charged discharged During discharge oscillator generates internal blanking pulse that resets Latch and, inhibits outputs. threshold voltage oscillator comparator trimmed guarantee oscillator accuracy 5.0% 25°C. Additional dead time added externally increasing charge current shown Figure This changes charge discharge ratio which internally Icharge/10 Icharge. charge discharge ratio will
Deadtime additional charge charge)
Soft-Start latch incorporated prevent erratic operation this circuitry. conditions cause Soft-Start circuit latch that Soft-Start capacitor stays discharged. first condition activation undervoltage lockout either Vref. second condition when current sense input exceeds Since this latch "set dominant", cannot reset until either these signals removed and, voltage CSoft-Start less than
Comparator Latch
circuit typically compares error voltage with ramp signal. outcome this comparison determines state output. voltage mode operation ramp signal voltage ramp timing capacitor. current mode operation ramp signal voltage ramp induced current sensing element. ramp input comparator pinned that user decide which mode operation best suits application requirements. ramp input 1.25 offset such that whenever voltage this exceeds error amplifier output voltage minus 1.25 comparator will cause latch set, disabling outputs. Once latch set, only blanking pulse oscillator reset thus initiating next cycle.
Current Limiting Shutdown
bidirectional clock provided synchronization master/slave operation. master, clock provides positive output pulse during discharge slave, clock input that resets latch blanks drive output, does discharge Therefore, oscillator synchronized driving clock alone. Figures provide suggested synchronization.
Error Amplifier
fully compensated Error Amplifier provided. features typical voltage gain gain bandwidth product with degrees phase margin (Figure Typical application circuits will have noninverting input tied reference. inverting input will typically connected feedback voltage generated from output switching power supply. Both inputs have common mode voltage (VCM) input range Error Amplifier Output provided external loop compensation.
Soft-Start Latch
provided perform current limiting shutdown operations. comparators connected input this pin. reference voltage current limit comparator internally. provided user voltage. When voltage current limit input exceeds externally voltage, latch set, disabling output. this cycle-by-cycle current limiting accomplished. current limit resistor used series with power devices, value resistor found
Sense Limit Reference Voltage (switch)
voltage this exceeds second comparator activated. This comparator sets latch which, turn, causes soft start capacitor discharged. this "hiccup" mode recovery possible case output short circuits. current limit resistor used series with output devices, peak current which controller will enter "hiccup" mode given
shutdown Sense
Soft-Start accomplished conjunction with external capacitor. Soft-Start capacitor charged internal current source. This capacitor clamps
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Undervoltage Lockout
There undervoltage lockout circuits within first senses second Vref. During power-up, must exceed Vref must exceed before outputs enabled Soft-Start latch released. falls below Vref falls below outputs disabled Soft-Start latch activated. When UVLO active, part current standby mode allowing have off-line bootstrap start-up circuit. Typical start-up current
Output
current feedback loop. been shown that instability caused double pole half switching frequency. external ramp (Se) added on-time ramp (Sn) current-sense waveform, stability achieved. must careful much ramp compensation. much added system will start perform like voltage mode regulator. benefits current mode control will lost. Figure example which external ramp compensation implemented.
Ramp Compensation Ramp Input Ramp Compensation Current Signal 1.25
MC34023 high current totem pole output specifically designed direct drive power MOSFETs. capable peak drive current with typical rise fall time driving load. Separate pins Power Ground provided. With proper implementation, significant reduction switching transient noise imposed control circuitry possible. separate supply input also allows designer added flexibility tailoring drive voltage independent VCC.
Reference
Figure Ramp Compensation
bandgap reference pinned trimmed initial accuracy ±1.0% 25°C. This reference short circuit protection source excess powering additional control system circuitry.
Design Considerations
simple equation used calculate amount external ramp slope necessary that will achieve stability current loop. following equations, calculated values application circuit Figure also shown.
attempt construct converter wire-wrap plug-in prototype boards. With high frequency, high power, switching power supplies imperative have separate current loops signal paths power paths. printed circuit layout should contain ground plane with current signal high current switch output grounds returning separate paths back input filter capacitor. Shown Figure printed circuit layout application circuit. Note power ground traces run. bypass capacitors snubbers should connected close possible specific part question. board lead lengths must less than inches effective bypassing snubbing.
Instabilities
where:
output voltage number power transformer primary secondary turns gain current sense network (see Figures output inductor current sense resistance
(0.3)(0.55) application circuit: 0.115 V/ms
current mode control, instability encountered given duty cycle. instability caused
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FUNCTION DESCRIPTION
DIP/SOIC Function Error Inverting Input Error Noninverting Input Error Output Clock Ramp Input Soft-Start Current Limit/ Shutdown Ground Current Limit Reference Input Power Ground Description This usually used feedback from output power supply. This used provide reference which error signal produced output error amp. Usually this connected Vref, however external reference also used. This provided compensating error poles zeros encountered power supply system, mostly output filter. This bidirectional used synchronization. value sets charge current through timing Capacitor, conjunction with timing Capacitor sets switching frequency. voltage mode operation this connected current mode operation this connected through filter current sensing element. capacitor this sets Soft-Start time. This functions. First, provides cycle-by-cycle current limiting. Second, current excessive, this will reinitiate Soft-Start cycle. This ground control circuitry. This voltage sets threshold cycle-by-cycle current limiting. This separate power ground return that connected back power source. used reduce effects switching transient noise control circuitry. This separate power source connection outputs that connected back power source input. With separate power source connection, reduce effects switching transient noise control circuitry. This high current totem pole output. This positive supply control This reference. usually connected noninverting input error amplifier.
Output Vref
Oscillator From Current Sense Element
Oscillator
Output Voltage Feedback Input Vref
1.25
1.25
Output Voltage Feedback Input
Vref
voltage mode operation, control range output Error Amplifier from duty cycle from 2.25 4.05
current mode control, filter should placed ramp input filter leading edge spike caused turn-on power MOSFET.
Figure Voltage Mode Operation
Figure Current Mode Operation
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MC34023, MC33023
ISense
ISense
addition filter will eliminate instability caused leading edge spike current waveform. This sense signal also used ramp input current mode control. ramp compensation necessary know gain current feedback loop. transformer used, gain calculated
addition filter will eliminate instability caused leading edge spike current waveform. This sense signal also used ramp input current mode control. ramp compensation necessary know gain current feedback loop. gain calculated
Sense turns ratio
turns ratio
Figure Resistive Current Sensing
Figure Primary Side Current Sensing
Current Sense Information 1.25 Oscillator
This method slope compensation easy implement, however, noise sensitive. Capacitor provides coupling. oscillator signal added current signal voltage divider consisting resistors
Figure 26A. Slope Compensation (Noise Sensitive)
Current Sense Transformer Output Ramp Input 1.25
Figure
Output
Ramp Input 1.25
Current Sense Resistor
When only output used, this method slope compensation used relatively noise immune. Resistor capacitor provide added slope necessary. choosing with larger time constant than switching frequency, assume that charge linear. First choose then adjusted achieve required slope. diode provides reset pulse ramp input every cycle. charge current calculated CMSe. Then calculated VCC/IM.
Figure 26B. Slope Compensation (Noise Immune)
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MC34023, MC33023
Vref Oscillator Oscillator
Additional dead time added addition dead time resistor from Vref text Oscillator section more information.
sync pulse into clock must least need slower than sync frequency. This circuit also used Voltage Mode operation master/slave operation. clock signal would coming from master which desired operating frequency, while slave slower.
Figure Dead Time Addition
Figure External Clock Synchronization
Master Oscillator Vref
Slave Oscillator
Figure Current Mode Master/Slave Operation Over Short Distances
Reference
2200
MMBT3906 MMBT3904
MMBD0914 1.15
Slave Oscillator
Master Oscillator
Figure Synchronization Over Long Distances
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MC34023, MC33023
Vref
Base Charge Removal
voltage mode operation, maximum duty cycle clamped. addition transistor buffer clamp voltage, Soft-Start current affected equation Soft-Start clamp
Current Sense Input
totem pole output furnish negative base current enhanced transistor turn-off, with addition capacitor series with base.
current mode operation, this circuit will limit maximum voltage allowed ramp input cycle.
Figure Buffered Maximum Clamp Level
Figure Bipolar Transistor Drive
Current Sense Input
series gate resistor needed dampen high frequency parasitic oscillation caused MOSFET's input capacitance series wiring inductance gate-source circuit. series resistor will also decrease MOSFET switching speed. Schottky diode reduce driver's power dissipation excessive ringing, preventing output from being driven below ground. Schottky diode also prevents substrate injection when output driven below ground.
totem pole output easily drive pulse transformers. Schottky diode recommended when driving inductive loads high frequencies. diode reduce driver's power dissipation excessive ringing, preventing output from being driven below ground.
Figure MOSFET Parasitic Oscillations
Figure Isolated MOSFET Drive
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1N5819 Vref 1000 0.01 0.015 Vref Error Oscillator 1.25 Comparator Vref UVLO Current Limit Shutdown Reference Regulator UVLO Soft-Start Latch 1N5819 IRF640 MBR2535 1600 MUR410
1500
1500
Latch
Figure Application Circuit
MC34023, MC33023
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Soft-Start
Primary: turns (1300 strands litz wire) Secondary: turns 0.003'' layers) copper foil Bootstrap: turn added secondary Core: Philips 3F3, part #4312 4124 Bobbin: Philips part #4322 3525 Coilcraft P3269-A turns (1300 strands litz wire) Core: Philips 3F3, part #EP10-3F3 Bobbin: Philips part #EP10PCB1-8 Coilcraft P3270-A Heatsinks Power FET: AAVID Heatsink #533902B02552 with clip Output Rectifiers: AAVID Heatsink #533402B02552 with clip Insulators power devices insulated with Berquist Sil-Pad 10(1.0 ceramic capacitors parallel 5(1.5 resistors parallel
Test Line Regulation Load Regulation Output Ripple Efficiency
Condition 7.5A
Result 0.275% 1.0% mVp-p 69.8%
MC34023, MC33023
1N5819
1N5819
1500
2535CTI
1N5819
MC34023
1000 0.01
0.01
0.01
2200
2535CTI
1500
(Top View) Figure Board With Components
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(Top View)
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PACKAGE DIMENSIONS
PDIP-16 SUFFIX CASE 648-08 ISSUE
NOTES: DIMENSIONING TOLERANCING ANSI Y14.5M, 1982. CONTROLLING DIMENSION: INCH. DIMENSION CENTER LEADS WHEN FORMED PARALLEL. DIMENSION DOES INCLUDE MOLD FLASH. ROUNDED CORNERS OPTIONAL. INCHES 0.740 0.770 0.250 0.270 0.145 0.175 0.015 0.021 0.040 0.70 0.100 0.050 0.008 0.015 0.110 0.130 0.295 0.305 0.020 0.040 MILLIMETERS 18.80 19.55 6.35 6.85 3.69 4.44 0.39 0.53 1.02 1.77 2.54 1.27 0.21 0.38 2.80 3.30 7.50 7.74 0.51 1.01
SEATING PLANE
0.25 (0.010)
SO-16W SUFFIX CASE 751G-03 ISSUE
NOTES: DIMENSIONS MILLIMETERS. INTERPRET DIMENSIONS TOLERANCES ASME Y14.5M, 1994. DIMENSIONS INLCUDE MOLD PROTRUSION. MAXIMUM MOLD PROTRUSION 0.15 SIDE. DIMENSION DOES INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL 0.13 TOTAL EXCESS DIMENSION MAXIMUM MATERIAL CONDITION. MILLIMETERS 2.35 2.65 0.10 0.25 0.35 0.49 0.23 0.32 10.15 10.45 7.40 7.60 1.27 10.05 10.55 0.25 0.75 0.50 0.90
0.25
SEATING PLANE
0.25
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Notes
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Notes
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MC34023/D
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