UCC2891 datasheet(6/42 Pages) TI1

Part #	UCC2891

Description	CURRENT-MODE ACTIVE CLAMP PWM CONTROLLER

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Manufacturer	TI1 [Texas Instruments]

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UCC2891, UCC2892

UCC2893, UCC2894

SLUS542F − OCTOBER 2003 − REVISED JULY 2009

6

www.ti.com

FUNCTIONAL BLOCK DIAGRAM

1

2

3

4

16

15

14

13

VIN (UCC2891/3)

LINEOV (UCC2892/4)

LINEUV

VDD

OUT

RDEL

RTON

RTOFF

VREF

5

6

7

8

SYNC

GND

CS

RSLOPE

12

11

10

9

AUX

PGND

SS/SD

FB

IRDEL

SYNC

CLOCK

REF

GEN

VDD

5 * ISLOPE

VREF

ISLOPE

CT

+

3 * R

SQ

Q

R

PWM

OFF

TURN−ON

DELAY

TURN−ON

DELAY

IRDEL

VREF

2 * R

+

PWM Offset

0.5 V

OUT

1−DMAX

CT

0.05 * IRDEL

VREF

+

UCC2892/4

UCC2891/3

1.27 V

0.75 V

UV

1.27 V

0.05 * IRDEL

VREF

+

OV

1.27 V

+

VDD

13 V/ 8 V

OUT

VDD

93/94

N−Ch.

UVLO

AND

SS

VDD

VREF

UV

OV

VREF

ENABLE

92/94

91/93

91/92

P−Ch.

VDD

OK

OV OFF

UV OFF

1−DMAX

TYP: VREF = 5.0 V

75k

1/2 x VREF

IRTON

IRDEL

ISS = 0.43 x IRTON

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UCC2891 Datasheet(PDF) 6 Page - Texas Instruments

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