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隔离电源与离线式PWM控制器参考设计指南

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隔离电源与离线式PWM控制器参考设计指南 Quick Reference Guide for Isolated and Off-Line PWM Controllers and Other Useful Helper ICs This document lists data sheets and applications information for isolated power supply designs. Links, shown in blue, take you to the full documentation on the Maxim...

隔离电源与离线式PWM控制器参考设计指南
Quick Reference Guide for Isolated and Off-Line PWM Controllers and Other Useful Helper ICs This document lists data sheets and applications information for isolated power supply designs. Links, shown in blue, take you to the full documentation on the Maxim website. General Description The MAX5021/MAX5022 current-mode PWM controllers contain all the control circuitry required for the design of wide input voltage range isolated power supplies. These devices are well suited for use in universal input (85VAC to 265VAC) off-line or telecom (-36VDC to -72VDC) power supplies. An undervoltage lockout (UVLO) circuit with large hys- teresis coupled with low startup and operating current reduce power dissipation in the startup resistor and allow use of ceramic bypass capacitors. The 262kHz switching frequency is internally trimmed to ±12% accuracy; this allows the optimization of the magnetic and filter components resulting in compact, cost-effec- tive power supplies. The MAX5021 with 50% maximum duty cycle and MAX5022 with 75% maximum duty cycle are recommended for forward converters and fly- back converters, respectively. The MAX5021/MAX5022 are available in 6-pin SOT23, 8-pin µMAX, and 8-pin DIP packages and are rated for operation over the -40°C to +85°C temperature range. Applications Universal Off-Line Power Supplies Standby Power Supplies Isolated Power Supplies Isolated Telecom Power Supplies Mobile Phone Chargers Features ♦ Available in a Tiny 6-Pin SOT23 Package ♦ 50µA Typical Startup Current ♦ 1.2mA Typical Operating Current ♦ Large UVLO Hysteresis of 14V ♦ Fixed Switching Frequency of 262kHz ±12% ♦ 50% Maximum Duty Cycle Limit (MAX5021) ♦ 75% Maximum Duty Cycle Limit (MAX5022) ♦ 60ns Cycle-by-Cycle Current-Limit Response Time M A X 5 0 2 1 /M A X 5 0 2 2 Current-Mode PWM Controllers for Isolated Power Supplies ________________________________________________________________ Maxim Integrated Products GND VCCNDRV 1 6 OPTO 5 VIN CS MAX5021 MAX5022 SOT23 TOP VIEW 2 3 4 NDRV N.C.N.C. 1 2 8 7 CS GNDVIN VCC OPTO PDIP/µMAX 3 4 6 5 MAX5021 MAX5022 Pin Configuration Ordering Information MAX5021 MAX5022 VOUT VSUPPLY OPTO NDRV CS VCC VIN GND Typical Operating Circuit 19-2066; Rev 1; 9/01 EVALUATION K IT AVAILABLE For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. PART MAX DUTY CYCLE TEMP. RANGE PIN- PACKAGE TOP MARK MAX5021EUT 50% -40°C to +85°C 6 SOT23-6 AASQ MAX5021EUA 50% -40°C to +85°C 8 µMAX — MAX5021EPA 50% -40°C to +85°C 8 PDIP — MAX5022EUT 75% -40°C to +85°C 6 SOT23-6 AASR MAX5022EUA 75% -40°C to +85°C 8 µMAX — MAX5022EPA 75% -40°C to +85°C 8 PDIP — WARNING: The MAX5021/MAX5022 are designed to work with high voltages. Exercise caution! E va lu a te s: M A X 5 0 2 2 MAX5022 Evaluation Kit _______________________________________________________________________________________ 63 5 TE RM IN AL B LO CK TB -1 TB -2 F1 3 2 1 4 AC AC D3 L2 47 0µ H R8 1. 2k Ω C1 10 µF 40 0V C9 10 µF 40 0V R1 36 0k Ω R1 2 10 0k Ω C1 1 10 00 pF R2 36 0k Ω C2 0. 22 µF L3 D4 D1 1 7 8 9 C7 10 00 pF C4 47 µF 6.3 V R3 1k Ω 1% 1 U2 -A R1 0 10 Ω C 5 0. 01 µF 3 4 5 U3 2 R5 8. 06 kΩ 1%R 4 24 .9 kΩ 1% C6 0. 1µ F C1 0 47 µF 6. 3V +5 V VO UT GN D L1 D2 10 11 12 T1 CT X0 3_ 15 25 6 N1 R6 10 Ω R7 1. 78 Ω 1% C8 82 00 pF 1 CS 3 ND RV 5 V I N V C C 4 6 2 R1 1 1. 5k Ω 1% C1 2 0. 01 µFC3 0. 22 µF 5 4 6 U2 -B R9 24 0k Ω OP TO GN D M AX 50 22 U1 SE CO ND AR Y GR OU ND PR IM AR Y GR OU ND NO TE : A LL R ES IS TO RS A RE 5 % U NL ES S OT HE RW IS E SP EC IF IE D Figure 2. MAX5022 EV Kit Schematic General Description The MAX5052/MAX5053 current-mode PWM controllers contain all the control circuitry required for the design of wide-input-voltage isolated and nonisolated power supplies. The MAX5052 is well suited for universal input (rectified 85VAC to 265VAC) or telecom (-36VDC to -72VDC) power supplies. The MAX5053 is well suited for low-input-voltage (10.8VDC to 24VDC) power supplies. The MAX5052/MAX5053 contain an internal error ampli- fier that regulates the tertiary winding output voltage. This implements a primary-side regulated, isolated power supply, eliminating the need for an optocoupler. An input undervoltage lockout (UVLO) is provided for programming the input-supply start voltage and to ensure proper operation during brownout conditions. The input-supply start voltage is externally programma- ble with a voltage-divider. To shutdown the device, the UVLO pin is pulled low. Internal digital soft-start reduces output voltage overshoot. The internal thermal shutdown circuit protects the device in the event the junction temperature exceeds +130°C. The MAX5052 has an internal bootstrap UVLO with large hysteresis that requires a minimum voltage of 23.6V for startup. The MAX5053 does not have the internal bootstrap UVLO and can be biased directly from a minimum voltage of 10.8V. The 262kHz switching frequency is internally trimmed to ±12% accuracy; this allows the optimization of the magnetic and filter components resulting in compact, cost-effective power supplies. The MAX5052A/ MAX5053A are offered with a 50% maximum duty-cycle limit. The MAX5052B/MAX5053B are offered with a 75% maximum duty-cycle limit. These devices are available in 8-pin µMAX packages and operate over the -40°C to +85°C temperature range. Applications Features ♦ Available in a Tiny 8-Pin µMAX Package ♦ Current-Mode Control ♦ 50W Output Power ♦ Universal Offline Input Voltage Range Rectified 85VAC to 265VAC (MAX5052) ♦ VIN Directly Driven from 10.8V to 24V Input (MAX5053) ♦ Digital Soft-Start ♦ Programmable Input Startup Voltage ♦ Internal Bootstrap UVLO with Large Hysteresis (MAX5052) ♦ Internal Error Amplifier with 1% Accurate Reference ♦ Thermal Shutdown ♦ 45µA (typ) Startup Supply Current ♦ 1.4mA (typ) Operating Supply Current ♦ Fixed Switching Frequency of 262kHz ±12% ♦ 50% Maximum Duty-Cycle Limit (MAX5052A/MAX5053A) ♦ 75% Maximum Duty-Cycle Limit (MAX5052B/MAX5053B) ♦ 60ns Cycle-by-Cycle Current-Limit Response Time M A X 5 0 5 2 /M A X 5 0 5 3 Current-Mode PWM Controllers with an Error Amplifier for Isolated/Nonisolated Power Supplies ________________________________________________________________ Maxim Integrated Products Ordering Information 19-2590; Rev 0; 10/02 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Functional Diagram/Typical Operating Circuit/Selector Guide appear at end of data sheet. PART TEMP RANGE PIN-PACKAGE MAX5052AEUA -40°C to +85°C 8 µMAX MAX5052BEUA -40°C to +85°C 8 µMAX MAX5053AEUA -40°C to +85°C 8 µMAX MAX5053BEUA -40°C to +85°C 8 µMAX NDRV GNDCS 1 2 8 7 VIN VCCFB COMP UVLO/EN µMAX TOP VIEW 3 4 6 5 MAX5052 MAX5053 Pin Configuration Warning: The MAX5052/MAX5053 are designed to work with high voltages. Exercise caution. Universal Input AC Power Supplies Isolated Telecom Power Supplies Networking Systems Computer Systems/ Servers Industrial Power Conversion Isolated Keep-Alive Circuits 12V Boost Regulators 12V SEPIC Regulators EVALUAT ION KIT AVAILABL E Figure 5. MAX5052A EV Kit Schematic E va lu a te s: M A X 5 0 5 2 A MAX5052A Evaluation Kit _______________________________________________________________________________________ 6 NDRV 8 VIN MAX5052A U1 1 3 UVLO/EN COMP 2 FB +VIN FB_P C17 OPEN R4 42.2kΩ 1% R3 1MΩ 1% JU1 7 VCC R10 0Ω C8 OPEN 4 CS IN FB_PIN D6D8 L2 L1 5 GND R11 100Ω C7 0.22µF SHDN NOTE: MOSFET N1 = IR IRF7464 -VIN +VIN C14 0.022µF R9 14.3kΩ 1% C9 2200pF R2 2.49kΩ 1% R1 22.6kΩ 1% R5 0.170Ω 1% 1 2 3 4 4 5 8 10 12T D5 C5 47µF 25V 9T1 85 6 7 N1 C11 0.22µF 1 2 3 6 6T28T 35µH D3 OPEN 15T 7 C12 0.22µF D4 C3 68µF 6.3V C15 1µF C13 1µF C4 22µF 6.3V SGND VOUT1 SGND VOUT2 C10 OPEN R8 OPEN R7 1.2kΩ R12 1.2kΩ D7 OPEN C16 15µF 35V R6 33kΩ C1 1µF 100V C2 1µF 100V +VIN D1 D2 C6 0.0047µF 250VAC General Description The MAX5014/MAX5015 integrate all the building blocks necessary for implementing DC-DC fixed-fre- quency isolated power supplies. These devices are current-mode controllers with an integrated high-volt- age startup circuit suitable for isolated telecom/industri- al voltage range power supplies. Current-mode control with leading-edge blanking simplifies control-loop design and internal ramp compensation circuitry stabi- lizes the current loop when operating at duty cycles above 50% (MAX5014). The MAX5014 allows 85% operating duty cycle and could be used to implement flyback converters, whereas the MAX5015 limits the operating duty cycle to less than 50% and can be used in single-ended forward converters. A high-voltage startup circuit allows these devices to draw power directly from the 18V to 110V input supply during start- up. The switching frequency is internally trimmed to 275kHz ±10%, thus reducing magnetics and filter com- ponent costs. The MAX5014/MAX5015 are available in 8-pin SO packages. An evaluation kit (MAX5015EVKIT) is also available. Warning: The MAX5014/MAX5015 are designed to operate with high voltages. Exercise caution. Applications Telecom Power Supplies Industrial Power Supplies Networking Power Supplies Isolated Power Supplies Features ♦ Wide Input Range: (18V to 110V) or (13V to 36V) ♦ Current-Mode Control ♦ Leading-Edge Blanking ♦ Internally Trimmed 275kHz ±10% Oscillator ♦ Low External Component Count ♦ Soft-Start ♦ High-Voltage Startup Circuit ♦ Pulse-by-Pulse Current Limiting ♦ Thermal Shutdown ♦ SO-8 Package M A X 5 0 1 4 /M A X 5 0 1 5 Current-Mode PWM Controllers with Integrated Startup Circuit for Isolated Power Supplies ________________________________________________________________ Maxim Integrated Products GND CS 1 2 8 7 VCC NDRVVDD OPTO V+ 8-SO TOP VIEW 3 4 6 5 MAX5014/ MAX5015 SS_SHDN Pin Configuration Ordering Information MAX5015 VDD V+ SS_SHDN NDRV CS GND VCC OPTO VIN VOUT OPTOCOUPLER Typical Operating Circuit 19-2082; Rev 0; 7/01 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. EVALUAT ION KIT AVAILABL E PART TEMP. RANGE PIN-PACKAGE MAX5014CSA* 0°C to +70°C 8-SO MAX5014ESA* -40°C to +85°C 8-SO MAX5015CSA* 0°C to +70°C 8-SO MAX5015ESA* -40°C to +85°C 8-SO *See Selector Guide at end of data sheet. E va lu a te s: M A X 5 0 1 5 MAX5015 Evaluation Kit _______________________________________________________________________________________ Figure 4. MAX5015 EV Kit Schematic 7 4 GND CS MAX5015 U1 NDRV 6 5 V+ VCC VDD OPTO 1 8 2 3 SS/SHDN CS VOUT CS N1 VOUT SGND C7 560µF 6.3V C12 0.001µF 200V C8 0.047µF C6 0.68µF C5 0.68µF C4 0.68µF R3 20Ω R6 0.1Ω 1% R1 OPEN R8 499Ω 1% R11 25.5kΩ 1% R13 4.75kΩ 1% R15 3.32kΩ 1% R12 8.35kΩ 1% R5 240kΩ R10 SHORT R9 150Ω R16 51Ω R17 51Ω R7 1Ω D1 OPEN SHORT COLLECTION TO EMITTER L1 4.7µH D5 VIN VDD D4 T1 3 32 1 Q1 4 5 6 1 11, 12 3 1 2 8, 9 1 2 2 3 D3 C2 0.01µF C11 0.33µF C1 0.1µFC910µF C10 0.1µF C17 0.022µF C3 OPEN VIN+ +SENSE VIN- VDD VCC C13 560µF 6.3V C14 560µF 6.3V C16 0.0047µF 250VAC C15 0.1µF SHDN 6 7 D2 OPEN U2 U3 5 3 5 1 2 4 -SENSE VIN 12T 5T 14T 5T General Description The MAX5003 high-voltage switching power-supply controller has all the features and building blocks need- ed for a cost-effective flyback and forward voltage- mode control converter. This device can be used to design both isolated and nonisolated power supplies with multiple output voltages that operate from a wide range of voltage sources. It includes a high-voltage internal start-up circuit that operates from a wide 11V to 110V input range. The MAX5003 drives an external N- channel power MOSFET and has a current-sense pin that detects overcurrent conditions and turns off the power switch when the current-limit threshold is exceeded. The choice of external power MOSFET and other external components determines output voltage and power. The MAX5003 offers some distinctive advantages: soft- start, undervoltage lockout, external frequency synchro- nization, and fast input voltage feed-forward. The device is designed to operate at up to 300kHz switch- ing frequency. This allows use of miniature magnetic components and low-profile capacitors. Undervoltage lockout, soft-start, switching frequency, maximum duty cycle, and overcurrent protection limit are all adjustable using a minimum number of external components. In systems with multiple controllers, the MAX5003 can be externally synchronized to operate from a common sys- tem clock. Warning: The MAX5003 is designed to operate with high voltages. Exercise caution. The MAX5003 is available in 16-pin SO and QSOP pack- ages. An evaluation kit (MAX5003EVKIT) is also available. Applications Telecommunication Power Supplies ISDN Power Supplies +42V Automobile Systems High-Voltage Power-Supply Modules Industrial Power Supplies Features ♦ Wide Input Range: 11V to 110V ♦ Internal High-Voltage Startup Circuit ♦ Externally Adjustable Settings Output Switch Current Limit Oscillator Frequency Soft-Start Undervoltage Lockout Maximum Duty Cycle ♦ Low External Component Count ♦ External Frequency Synchronization ♦ Primary or Secondary Regulation ♦ Input Feed-Forward for Fast Line-Transient Response ♦ Precision ±2.5% Reference over Rated Temperature Range ♦ Thermal Shutdown M A X 5 0 0 3 High-Voltage PWM Power-Supply Controller ________________________________________________________________ Maxim Integrated Products 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 V+ VDD VCC NDRV PGND CS AGND MAXTON FB TOP VIEW MAX5003 QSOP/Narrow SO INDIV ES REF FREQ SS CON COMP 19-1555; Rev 2; 4/02 PART MAX5003CEE MAX5003CSE MAX5003EEE -40°C to +85°C 0°C to +70°C 0°C to +70°C TEMP. RANGE PIN-PACKAGE 16 QSOP 16 Narrow SO 16 QSOP EVALUAT ION KIT AVAILABL E Note: Dice are designed to operate over a -40°C to +140°C junc- tion temperature (Tj) range, but are tested and guaranteed at TA = +25°C. Pin Configuration Ordering Information MAX5003ESE -40°C to +85°C 16 Narrow SO MAX5003C/D (Note A) Dice For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. E va lu a te s: M A X 5 0 0 3 MAX5003 Evaluation Kit _______________________________________________________________________________________ M AX 50 03 U1 1 1 1 1 13 12 11 10 9 CS VI ND IV V+ PG ND AG ND FB 62 CO M P 2 2 109 1211 2 1 1 2, 3 6, 78 6 7 5 2 2 V C C M AX TO N NO T IN ST AL LE D CO M P R6 51 kΩ SW 2 R1 5 43 Ω R1 6 24 .9 kΩ 1% R2 17 .4 kΩ 1% R9 0. 11 Ω 1/ 4W 1% R1 0 10 0Ω R1 1 10 0k Ω R5 39 kΩ R8 43 Ω R2 0 68 0Ω R1 41 .2 kΩ 1% R1 7 24 .9 kΩ 1% R1 8 OP EN R1 9 OP EN R1 4 24 0k Ω U3 M OC 21 7 R1 3 1. 3k Ω R4 1M Ω C1 2 39 0p F C6 39 00 pF C7 0. 01 µF C5 22 00 pF R7 20 0k Ω R3 68 kΩ R1 2 20 kΩ R2 2 1M Ω 14 ND RV 15 D2 D1 JU 1 CU T HE RE +5 V SW 1- A IS O GN D NO N T1 2 7 8 1 5 3 52 1 3 V D D VD D VD D 16 ES 3 3 3 3 Q2 FR EQ RE F RE F RE F 4 4 SS 5 RE F LV L DI R Q1 RE F NO N SW 1- B IS O 6 CO N 7 8 C1 33 µF 10 0V C8 10 µF 16 V VI N SH DN GN D (-4 8V ) R2 3 1M Ω C9 10 0p F C1 1 0. 1µ F C1 7 0. 1µ F C1 0 0. 47 µF C1 3 0. 1µ F N1 C2 22 µF 10 V C3 22 µF 10 V R2 1 15 Ω C1 6 4. 7µ F 25 V VD D U2 TL 43 1 Figure 1. MAX5003 EV Kit Schematic General Description The MAX5051 is a clamped, two-switch power-supply controller IC. This device can be used both in forward or flyback configurations with input voltage ranges from 11V to 76V. It provides comprehensive protection mechanisms against possible faults, resulting in very high reliability power supplies. When used in conjunction with secondary-side synchronous rectification, power- supply efficiencies can easily reach 92% for a +3.3V output power supply operated from a 48V bus. The integrated high- and low-side gate drivers provide more than 2A of peak gate drive current to two external N-channel MOSFETs. Low startup current reduces the power loss across the bootstrap resistor. A feedforward voltage-mode topology provides excellent line rejection while avoiding the pitfalls of traditional current-mode control. The MAX5051 power-supply controller is primary as well as secondary-side parallelable, allowing the design of scaleableable power systems when necessary. When paralleling the primary side, dedicated pins allow for simultaneous wake-up or shutdown of all paralleled units, thus avoiding any one unit current-hogging during startup or fault conditions. The MAX5051 generates a lookahead signal for driving secondary-side synchronous MOSFETs. Special primary-side synchronization inputs/outputs allow two primaries to be operated 180° out of phase for increased output power and lower input ripple currents. The MAX5051 is available in a 28-pin TSSOP-EP package and operates over a wide temperature range of -40°C to +125°C. Applications High-Efficiency Isolated Telecom/Datacom Power Supplies 48V and 12V Server Power Supplies 48V Power-Supply Modules 42V Automotive Power Systems Industrial Power Supplies Features ♦ Wide Input Voltage Range, 11V to 76V ♦ Voltage Mode With Input Voltage Feed-Forward ♦ Ripple-Phased Parallel Topology Compatible For High Current/Power Output ♦ 2A Integrated High- and Low-Side MOSFET Drivers ♦ SYNCIN And SYNCOUT Pins Enable 180° Out Of Phase Operation ♦ Programmable Brownout and Bootstrap UVLOs ♦ High-Side Driver Bootstrap Capacitor Pre-Charge Driver ♦ Low Current-Limit Threshold For High Efficiency ♦ Programmable Switching Frequency ♦ Reference Voltage Soft-Start For Startup Without Overshoots ♦ Startup Synchronization With Multiple Paralleled Primaries ♦ Programmable Integrating Current-Limit Fault Protection ♦ Look-Ahead PWM Signal For Secondary-side Synchronous Rectifier Drivers ♦ Look-Ahead Drivers For Either High-Speed Optocouplers or Pulse Transformer ♦ Wide -40°C to +125°C Operating Range ♦ Thermally Enhanced 28-Pin TSSOP Package M A X 5 0 5 1 Parallelable, Clamped Two-Switch Power-Supply Controller IC ________________________________________________________________ Maxim Integrated Products Ordering Information XX-XXXX; Rev 0; 4/03 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. PART TEMP RANGE PIN-PACKAGE MAX5051AUI -40°C to +125°C 28-TSSOP-EP* *EP = Exposed pad. Pin Configuration appears at end of data sheet. PR .2 Tboblet 04/15/03 M A X 5 0 5 1 Parallelable, Clamped Two-Switch Power-Supply Controller IC ______________________________________________________________________________________ RE G5 R2 1 24 .9 kΩ 1% C1 10 0p F 1 RC OS C +V IN TP 1 R2 5 10 0k Ω C2 39 0p F 3 RC FF 5 CS S 4 CO M 6 CO M P 7 FB 8 RE G5 2 SY NC OU T C5 47 00 pF D8 2 1 R1 5 31 .6 kΩ 1% R1 6 10 .5 kΩ 1% C4 4. 7µ F RE G5 RE G5 9 RE G9 C3 4. 7µ F RE G9 10 PV IN C6 4. 7µ F PV IN 11 ST T 12 LX VD D 13 LX H C1 8 10 0p F R2 7 10 Ω C1 9 1µ F LX H TP 3 14 LX L R3 2. 2k Ω R1 1 36 0Ω C1 7 0. 33 µF C2 4 10 00 pF 4 3 1 2 U2 R2 0 0Ω R1 9 47 5Ω R1 2 10 0k Ω 1% C2 7 0. 15 µF VO UT C3 6 0. 22 µF C2 8 0. 04 7µ F R1 11 .5 kΩ 1% R2 2. 55 kΩ 1% VO UT R2 3 10 Ω
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