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UCC3895PWTRG4 Datasheet(PDF) 1 Page - Texas Instruments |
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UCC3895PWTRG4 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 25 page UCC1895 UCC2895 UCC3895 SLUS157L − DECEMBER 1999 − REVISED APRIL 2008 BiCMOS ADVANCED PHASESHIFT PWM CONTROLLER 1 www.ti.com FEATURES D Programmable Output Turn-on Delay D Adaptive Delay Set D Bidirectional Oscillator Synchronization D Voltage-Mode, Peak Current-Mode, or Average Current-Mode Control D Programmable Softstart/Softstop and Chip Disable via a Single Pin D 0% to 100% Duty-Cycle Control D 7-MHz Error Amplifier D Operation to 1 MHz D Typical 5-mA Operating Current at 500 kHz D Very Low 150-µA Current During UVLO APPLICATIONS D Phase-Shifted Full-Bridge Converters D Off-Line, Telecom, Datacom and Servers D Distributed Power Architecture D High-Density Power Modules DESCRIPTION The UCC3895 is a phase-shift PWM controller that implements control of a full-bridge power stage by phase shifting the switching of one half-bridge with respect to the other. It allows constant frequency pulse-width modulation in conjunction with resonant zero-voltage switching to provide high efficiency at high frequencies. The part can be used either as a voltage-mode or current-mode controller. While the UCC3895 maintains the functionality of the UC3875/6/7/8 family and UC3879, it improves on that controller family with additional features such as enhanced control logic, adaptive delay set, and shutdown capability. Since it is built using the BCDMOS process, it operates with dramatically less supply current than it’s bipolar counterparts. The UCC3895 can operate with a maximum clock frequency of 1 MHz. UDG−03123 1 10 11 12 13 14 15 16 17 18 19 7 7 7 7 7 7 7 7 7 20 2 3 4 5 6 7 8 9 UCC3895 EAN EAP EAOUT RAMP REF GND SYNC CT RT DELAB DELCD ADS CS OUTD OUTC VCC PGND OUTB OUTA SS/DISB Q1 D B AC VIN VOUT VBIAS 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 2008, 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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