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MAX5094C Dataheets PDF



Part Number MAX5094C
Manufacturers Maxim Integrated Products
Logo Maxim Integrated Products
Description (MAX5094x / MAX5095x) Current-Mode PWM Controllers
Datasheet MAX5094C DatasheetMAX5094C Datasheet (PDF)

www.DataSheet4U.com 19-3864; Rev 3; 10/06 High-Performance, Single-Ended, Current-Mode PWM Controllers General Description The MAX5094A/B/C/D/MAX5095A/B/C BiCMOS, highperformance, 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 MAX5094/MAX5095 contain a fast comparator with only 60ns typical delay from current s.

  MAX5094C   MAX5094C


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www.DataSheet4U.com 19-3864; Rev 3; 10/06 High-Performance, Single-Ended, Current-Mode PWM Controllers General Description The MAX5094A/B/C/D/MAX5095A/B/C BiCMOS, highperformance, 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 MAX5094/MAX5095 contain a fast comparator with only 60ns typical delay from current sense to the output for overcurrent protection. The MAX5094 has an integrated error amplifier with the output at COMP. Softstart is achieved by controlling the COMP voltage rise using external components. The oscillator 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 MAX5095A/MAX5095B 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 of all devices together. When synchronizing with other devices, the MAX5095A/MAX5095B with the highest frequency synchronizes the other devices. Alternatively, the MAX5095A/MAX5095B can be synchronized to an external clock with an open-drain output stage running at a higher frequency. The MAX5095C 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 MAX5094A/B/C are available in the 8-pin SO and 8-pin µMAX ® packages. The MAX5094D and MAX5095A/B/C are available in the 8-pin µMAX package. All devices operate over the automotive temperature range of -40°C to +125°C. Features ♦ Pin-for-Pin Replacement for UCC28C43 (MAX5094A) and UCC28C45 (MAX5094B) ♦ 2A Drive Source and 1A Sink Capability ♦ Up to 1MHz Switching Frequency Operation ♦ Bidirectional Frequency Synchronization (MAX5095A/MAX5095B) ♦ Advanced Output Drive for Secondary-Side Synchronous Rectification (MAX5095C) ♦ Fast 60ns Cycle-by-Cycle Current Limit ♦ Trimmed Oscillator Capacitor Discharge Current Sets Maximum Duty Cycle Accurately ♦ Accurate ±5% Start Voltage with 0.8V Hysteresis ♦ Low 32µA Startup Current ♦ 5V Regulator Output (REF) with 20mA Capability ♦ Versions with 0.3V Current-Sense Threshold ♦ Overtemperature Shutdown MAX5094A/B/C/D/MAX5095A/B/C Ordering Information PART MAX5094AASA MAX5094AASA+ MAX5094AAUA* MAX5094AAUA+ MAX5094BASA* MAX5094BASA+ MAX5094BAUA* MAX5094BAUA+ TEMP RANGE -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C PINPACKAGE 8 SO 8 SO 8 µMAX 8 µMAX 8 SO 8 SO 8 µMAX 8 µMAX PKG CODE S8-4 S8-4 U8-1 U8-1 S8-4 S8-4 U8-1 U8-1 +Denotes lead-free package. *Future product—contact factory for availability. Ordering Information continued at end of data sheet. Pin Configurations TOP VIEW COMP 1 8 7 REF VCC OUT GND 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 µMAX is a registered trademark of Maxim Integrated Products, Inc. FB 2 MAX5094 CS 3 6 5 RT/CT 4 µMAX/SO 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 MAX5094A/B/C/D/MAX5095A/B/C 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, REF to GND .............-0.3V to +6V COMP Sink Current (MAX5094)..........................................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 .........................-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 .


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