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Part: MAX5070BAUA
Category:
Power Management
-> PWM Controllers
Description: High-Performance, Single-Ended, Current-mode PWM Controllers <<<>>>The MAX5070/MAX5071 Bicmos, High-performance, Current-mode PWM Controllers Have All The Features Required For Wide Input Voltage Range ISOlated/nonisolated Power Supplies. These Controllers Are Used For Low- And High-power Universal Input Voltage And Telecom Power Supplies. <<<>>>The MAX5070/MAX5071 Contain a Fast Comparator With Only 60ns Typical Delay From Current Sense to The Output For Overcurrent Protection. The MAX5070A/MAX5070B Have an Integrated Error Amplifier With The Output at Comp. Soft-start is Achieved BY Controlling The Comp Voltage Rise Using External Components. <<<>>><<<>>>The Frequency is Adjustable From 20kHz to 1MHz With an External Resistor And Capacitor. The Timing Capacitor Discharge Current is Trimmed Allowing For Programmable Dead Time And Maximum Duty Cycle For a Given Frequency. The Available Saw-toothed Waveform at RTCT CAN be Used For Slope Compensation When Needed. <<<>>><<<>>>The MAX5071A/MAX5071B Include a Bidirectional Synchronization Circuit Allowing For Multiple Controllers to Run at The Same Frequency to Avoid Beat Frequencies. Synchronization is Accomplished BY Simply Connecting The SYNC Pins of All Devices Together. When Synchronizing With Other Devices, The MAX5071A/MAX5071B With The Highest Frequency Synchronizes The Other Devices. Alternatively, The MAX5071A/MAX5071B CAN be Synchronized to an External Clock With an Opendrain Output Stage Running at a Higher Frequency. <<<>>><<<>>>The MAX5071C Provides a Clock Output Pulse (ADV_CLK) That Leads The Driver Output (OUT) BY 110ns. The Advanced Clock Signal is Used to Drive The Secondary-side Synchronous Rectifiers. <<<>>><<<>>>The MAX5070/MAX5071 Are Available in 8-pin µMAX And so Packages And Operate Over The Automotive Temperature Range of -40 C to +125 C. <<<>>><<<>>>FEATURES <<<>>>Pin-for-Pin Replacement For UC2842 (MAX5070A) And UC2844 (MAX5070B) <<<>>>2A Drive Source And 1A Sink Capability <<<>>>Up to 1MHz Switching Frequency Operation <<<>>>Bidirectional Synchronization (MAX5071A/MAX5071B) <<<>>>Advanced Output Drive For Secondary-side Synchronous Rectification (MAX5071C) <<<>>>Fast 60ns Cycle-by-cycle Current Limit <<<>>>Trimmed Oscillator Capacitor Discharge Current Sets Maximum Duty Cycle Accurately <<<>>>Accurate 5% Start And Stop Voltage With 6V Hysteresis <<<>>>Low 32µA Startup Current <<<>>>5V Regulator Output (VREF) With 20mA Capability <<<>>>Overtemperature Shutdown <<<>>> <<<>>>APPLICATIONS<<<>>>Computer Systems/servers<<<>>><<<>>>industrial Power Conversion<<<>>><<<>>>isolated Keep-alive Circuits<<<>>><<<>>>isolated Power-supply Modules<<<>>><<<>>>isolated Telecom Power Supplies<<<>>><<<>>>networking Systems<<<>>><<<>>>universal Input Ac/dc Power Supplies
Company: Maxim Integrated Products
Datasheet: Download MAX5070BAUA datasheet File size : 378 kB
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Datasheet text preview:
19-3283; Rev 0; 5/04
High-Performance, Single-Ended, Current-Mode PWM Controllers
General Description
The MAX5070/MAX5071 BiCMOS, high-performance, c u r r e n t - m o d e PWM controllers have all the features required for wide input voltage range isolated/nonisolated power supplies. These controllers are used for low- and high-power universal input voltage and telecom power supplies. The MAX5070/MAX5071 contain a fast comparator with only 60ns typical delay from current sense to the output for overcurrent protection. The MAX5070A/MAX5070B have an integrated error amplifier with the output at COMP. Soft-start is achieved by controlling the COMP voltage rise using external components. The frequency is adjustable from 20kHz to 1MHz with an external resistor and capacitor. The timing capacitor discharge current is trimmed allowing for programmable dead time and maximum duty cycle for a given frequency. The available saw-toothed waveform at RTCT can be used for slope compensation when needed. The MAX5071A/MAX5071B include a bidirectional synchronization circuit allowing for multiple controllers to run at the same frequency to avoid beat frequencies. Synchronization is accomplished by simply connecting the SYNC pins of all devices together. When synchronizing with other devices, the MAX5071A/MAX5071B w i t h the highest frequency synchronizes the other devices. Alternatively, the MAX5071A/MAX5071B can be synchronized to an external clock with an opendrain output stage running at a higher frequency. T h e MAX5071C provides a clock output pulse ( A D V _ C L K ) that leads the driver output (OUT) by 110ns. The advanced clock signal is used to drive the secondary-side synchronous rectifiers. The MAX5070/MAX5071 are available in 8-pin µMAX and SO packages and operate over the automotive temperature range of -40°C to +125°C.
®
Features
o Pin-for-Pin Replacement for UC2842 (MAX5070A) and UC2844 (MAX5070B) o 2A Drive Source and 1A Sink Capability o Up to 1MHz Switching Frequency Operation o Bidirectional Synchronization (MAX5071A/MAX5071B) o Advanced Output Drive for Secondary-Side Synchronous Rectification (MAX5071C) o Fast 60ns Cycle-by-Cycle Current Limit o Trimmed Oscillator Capacitor Discharge Current Sets Maximum Duty Cycle Accurately o Accurate 5% Start and Stop Voltage with 6V Hysteresis o Low 32µA Startup Current o 5V Regulator Output (VREF) with 20mA Capability o Overtemperature Shutdown
MAX5070/MAX5071
Ordering Information
PART MAX5070AASA MAX5070AAUA MAX5070BASA MAX5070BAUA TEMP RANGE -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C PIN-PACKAGE 8 SO 8 µMAX 8 SO 8 µMAX
Ordering Information continued at end of data sheet. Selector Guide appears at end of data sheet.
Pin Configurations
TOP VIEW
Applications
Universal Input AC/DC Power Supplies Isolated Telecom Power Supplies Isolated Power-Supply Modules Networking Systems Computer Systems/Servers Industrial Power Conversion Isolated Keep-Alive Circuits
COMP
1
8 7
VREF VCC OUT GND
FB 2 CS 3
MAX5070A MAX5070B
6 5
RT/CT 4
µMAX/SO µMAX is a registered trademark of Maxim Integrated Products, Inc. Pin Configurations continued at end of data sheet. 1
________________________________________________________________ Maxim Integrated Products
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.
High-Performance, Single-Ended, Current-Mode PWM Controllers MAX5070/MAX5071
ABSOLUTE MAXIMUM RATINGS
VCC (Low-Impedance Source) to GND .........-0.3V to +30V VCC (ICC < 30mA).....Self Limiting OUT to GND .....-0.3V to (VCC + 0.3V) OUT Current....±1A for 10µs FB, SYNC, COMP, CS, RT/CT, VREF to GND ..-0.3V to +6V COMP Sink Current (MAX5070).........10mA Continuous Power Dissipation (TA = +70°C) 8-Pin µMAX (derate 4.5mW/°C above +70°C) ....362mW 8-Pin SO (derate 5.9mW/°C above +70°C)......470.6mW Operating Temperature Range (Automotive) ....-40°C to +125°C Maximum Junction Temperature ....+150°C Storage Temperature Range .....-65°C to +150°C Lead Temperature (soldering, 10s) .........+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = +15V, RT = 10k, CT = 3.3nF, VVREF = OPEN, CVREF = 0.1µF, COMP = OPEN, VFB = 2V, CS = GND, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER REFERENCE Output Voltage Line Regulation Load Regulation Total Output Variation Reference Output-Noise Voltage Reference Output Short Circuit OSCILLATOR Initial Accuracy Voltage Stability Temp Stability RT/CT Voltage Ramp (P-P) RT/CT Voltage Ramp Valley Discharge Current Frequency Range FB Input Voltage FB Input Bias Current Open-Loop Voltage Gain Unity-Gain Bandwidth Power-Supply Rejection Ratio COMP Sink Current COMP Source Current COMP Output High Voltage COMP Output Low Voltage CURRENT-SENSE AMPLIFIER Gain Maximum Current-Sense Signal ACS V CS_MAX (Notes 3, 4) VCOMP = 5V (Note 3) 2.85 0.95 3 1 3.26 1.05 V/V V V RAMP V RAMP_VALLEY IDIS fOSC VFB I B(FB) AVOL fG B W PSRR ISINK ISOURCE V COMPH V COMPL 12V VCC 25V (Note 2) VFB = 2.7V, VCOMP = 1.1V VFB = 2.3V, VCOMP = 5V VFB = 2.3V, RCOMP = 15k to GND VFB = 2.7V, RCOMP = 15k to VREF 60 2 -0.5 5 2V VCOMP 4V FB shorted to COMP VRT/CT = 2V, TA = +25°C 7.9 20 2.465 2.5 -0.01 100 1 80 6 -1.2 5.8 0.1 1.1 -1.8 TA = +25°C 12V < VCC < 25V -40°C < TA < +85°C 51 54 0.2 0.5 1.7 1.1 8.3 8.7 1000 2.535 -0.1 57 0.5 kHz % % V V mA kHz V µA dB MHz dB mA mA V V V VREF V LINE V LOAD V REFT V NOISE I S_SC TA = +25°C, IVREF = 1mA 12V < VCC < 25V, IVREF = 1mA 1mA < IVREF < 20mA 1mA < IVREF < 20mA, 12V < VCC < 25V 10Hz < f < 10kHz, TA = +25°C VVREF = 0V -30 4.9 50 -100 -180 4.950 5.000 0.4 6 5.050 4 25 5.1 V mV mV V µV mA SYMBOL CONDITIONS MIN TYP MAX UNITS
ERROR AMPLIFIER (MAX5070A/MAX5070B)
2
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High-Performance, Single-Ended, Current-Mode PWM Controllers
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +15V, RT = 10k, CT = 3.3nF, VVREF = OPEN, CVREF = 0.1µF, COMP = OPEN, VFB = 2V, CS = GND, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER Power-Supply Rejection Ratio Input Bias Current Delay From CS to OUT MOSFET DRIVER OUT Low-Side On-Resistance OUT High-Side On-Resistance ISOURCE (Peak) ISINK (Peak) Rise Time Fall Time UNDERVOLTAGE LOCKOUT/STARTUP Startup Voltage Threshold Minimum Operating Voltage After Turn-On Undervoltage-Lockout Hysteresis PWM Maximum Duty Cycle Minimum Duty Cycle SUPPLY CURRENT Startup Supply Current Operating Supply Current Zener Bias Voltage at VCC THERMAL SHUTDOWN Thermal Shutdown Thermal-Shutdown Hysteresis SYNC Frequency Range SYNC Clock Input High Threshold SYNC Clock Input Low Threshold SYNC Clock Input Minimum Pulse Width SYNC Clock Output High Level SYNC Clock Output Low Level SYNC Leakage Current TSHDN THYST fS Y N C V SYNCINH V SYNCINL tP W _ S Y N C I N V SYNCOH V SYNCOL ISYNC 1mA external pulldown RSYNC = 5k VSYNC = 0V 200 4.0 4.7 0 0.01 0.1 0.1 20 3.5 0.8 +150 30 1000 °C °C kHz V V ns V V µA ISTART ICC VZ VFB = VCS = 0V ICC = 25mA 24 32 3 26.5 65 5 µA mA V DMAX D MIN MAX5070A/MAX5071A MAX5070B/MAX5071B/MAX5071C 94.5 48 96 49.8 97.5 50 0 % % V CC_START V CC_MIN UVLOHYST 15.2 9.2 16 10 6 16.8 10.8 V V V V RDS_ONL V RDS_ONH ISOURCE ISINK tr tf ISINK = 200mA ISOURCE = 100mA COUT = 10nF COUT = 10nF COUT = 1nF COUT = 1nF 4.5 3.5 2 1 15 22 10 7 A A ns ns SYMBOL PSRR ICS tCS_DELAY 50mV overdrive CONDITIONS 12V VCC 25V MIN TYP 70 -1 60 -2.5 MAX UNITS dB µA ns
MAX5070/MAX5071
SYNCHRONIZATION (MAX5071A/MAX5071B only) (Note 5)
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