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UCC2894DG4 Datasheet(PDF) 1 Page - Texas Instruments |
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UCC2894DG4 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 41 page UCC2891, UCC2892 UCC2893, UCC2894 SLUS542F − OCTOBER 2003 − REVISED JULY 2009 CURRENT MODE ACTIVE CLAMP PWM CONTROLLER 1 www.ti.com FEATURES D Low Output Jitter D Soft−Stop Shutdown of MAIN and AUX D Ideal for Active Clamp/Reset Forward, Flyback Converters D Provides Complementary Auxiliary Driver with Programmable Deadtime (Turn-On Delay) between AUX and MAIN Switches D Peak Current-Mode Control with Cycle-by-Cycle Current Limiting D 110-V Input Startup Regulator on UCC2891/3 D TrueDrivet 2-A Sink, 2-A Source Outputs D Accurate Line UV and Line OV Threshold D Programmable Slope Compensation D 1.0-MHz Synchronizable Oscillator D Precise Programmable Maximum Duty Cycle D Programmable Soft Start APPLICATIONS D 150-W to 700-W SMPS D High-Efficiency, Low EMI/RFI Off-Line or DC/DC Converters D Server, 48-V Telecom, Datacom D High Power Adapter, LCD-TV and PDP-TV DESCRIPTION The UCC2891/2/3/4 family of PWM controllers is designed to simplify implementation of the various active clamp/reset switching power topologies. The UCC289x is a peak current-mode, fixed- frequency, high-performance pulse width modulator. It includes the logic and the drive capability for the auxiliary switch with a simple method of programming the critical delays for proper active clamp operation. The UCC2891/3 includes a 110-V start-up regulator for initial start-up and to provide keep-alive power during stand-by. Additional features include an internal programmable slope compensation circuit, precise DMAX limit, and a single resistor programmable synchronizable oscillator. An accurate line monitoring function also programs the converter’s ON and OFF transitions with regard to the bulk input voltage. Along with the UCC2897, this UCC289x family allows the power supply designer to eliminate many of the external components, reducing the size and complexity of the design. 5 13 12 16 15 1 2 3 RDEL RTON RTOFF SYNC LINE UV OUT AUX PGND 4 VREF 11 VIN UCC2891 6 GND 7CS 8 RSLOPE 14 VDD SS/SD 10 FB 9 SECONDARY SIDE E/A Q1 Q2 LOAD SR DRIVE BIAS WINDING +VIN D3 Q3 D4 Q4 Lo Co D2 D1 RDEL R ON ROFF RSLOPE RF C F C VREF C BIAS C SS C AUX C CLAMP C BULK R OUT R CS D AUX PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright 2003 − 2009, Texas Instruments Incorporated Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. |
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