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UCC2897PW Datasheet(PDF) 1 Page - Texas Instruments |
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UCC2897PW Datasheet(HTML) 1 Page - Texas Instruments |
1 / 32 page UCC2897 SLUS591A − NOVEMBER 2003 − REVISED MARCH 2004 ADVANCED CURRENT MODE ACTIVE CLAMP PWM CONTROLLER 1 www.ti.com FEATURES D Ideal for Active Clamp/Reset Forward, Flyback and Synchronous Rectifier Apps D Provides Complementary Auxiliary Driver with Programmable Deadtime (Turn-On Delay) between AUX and MAIN Switches D Peak Current-Mode Control with 0.5-V Cycle-by-Cycle Current Limiting D Hiccup Mode 0.75-V Current Limit D TrueDrivet 2-A Sink, 2-A Source Outputs D 110-V Input Startup Device D Trimmed Internal Bandgap Reference for Accurate Line UV and Line OV Threshold D Programmable Slope Compensation D High-Performance 1.0-MHz Synchronizable Oscillator with Internal Timing Capacitor D Precise Programmable Maximum Duty Cycle D PB-Free Lead Finish Package APPLICATIONS D High-Efficiency DC/DC Power Supplies D Server Power, 48-V Telecom, Datacom, and 42-V Automotive Applications DESCRIPTION The UCC2897 PWM controller simplifies implementation of the various active clamp/reset and synchronous rectifier switching power topologies. Based on the UCC2891 active-clamp controller the UCC2897 is a peak current-mode, fixed- frequency, high-performance pulse width modulator. It includes the logic and the drive capability for the P-channel auxiliary switch along with a simple method of programming the critical delays for proper active clamp operation. Features include an internal programmable slope compensation circuit, precise DMAX limit, and a synchronizable oscillator with an internal timing capacitor. An accurate line monitoring function also programs the converter’s ON and OFF transitions with regard to the bulk input voltage. The UCC2897 adds a second level hiccup mode current sense threshold, bi-directional synchronization and the input overvoltage protection functionalities that are not available on the 16-pin UCC2891. The UCC2897 is offered in 20-pin TSSOP (PW) package. TYPICAL APPLICATION DIAGRAM CBULK RCS CCLAMP RF 7 15 14 1 18 3 4 5 RDEL RTON RTOFF SYNC LINEUV OUT AUX PGND 6 VREF 13 LINEOV UCC2897 8 GND 9CS 10 RSLOPE 17 VDD FB 11 SECONDARY SIDE E/A Q1 Q2 LOAD SR DRIVE BIAS WINDING +VIN 19 16 VIN PVDD SS/SD 12 UDG−03186 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. 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 2004, Texas Instruments Incorporated |
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