UCC1895

UCC2895

UCC3895

SLUS157L − DECEMBER 1999 − REVISED APRIL 2008

BiCMOS ADVANCED PHASESHIFT

PWM CONTROLLER

1

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FEATURES

Average Current-Mode Control

Disable via a Single Pin

APPLICATIONS

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.