UCC2961, UCC3961

ADVANCED PRIMARY SIDE STARTUP CONTROLLER

SLUS431A – MAY 2000 – REVISED DECEMBER 2000

1

POST OFFICE BOX 655303

Control

Transformer

Duty-Cycle Clamping

Frequency

Source)

Restart, Latching, or Cycle-by-Cycle

Current Limiting

Transformer Reset

Disconnect

Undervoltage Protection

typical application diagram

UDG–99039

14

1

8

4

3

5

7

13

12

11

6

9

2

10

UV/OV

STOP

FEED

BACK

SOFT START

FREQ

SET

VIN

CSD

PGND

SD

CS

OUT

VDD

START

AGND

RT

SS

FB

VS

OVS

UVS

OPTIONAL

DEPLETION

MODE

SWITCH

FAULT LATCH DELAY

+

VOLT

SEC

CLAMP

UCC3961

–

REF

Copyright

© 2000, Texas Instruments Incorporated

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.

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.