TSM121 datasheet(1/12 Pages) STMICROELECTRONICS

部件名	TSM121

功能描述	SINGLE CHIP PWM & HOUSEKEEPING IC FOR HALF BRIDGE SMPS

PDF	12 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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s HOUSEKEEPING CIRCUIT :

s Over voltage protection for 3.3V, 5V and 12V

without external components

s Additional Over voltage protection (-5V and/

or -12V, or Primary Over Power control) with

external components

s Under voltage protection for 3.3V, 5V and

12V without external components

s Over current protection for 3.3V, 5V and 12V

with internal threshold voltage

s Externally adjustable Inrush Current blanking

during transients

s Externally adjustable Under voltage blanking

during Power Up

s Power Good output

s Externally adjustable PG delay

s Remote input

s Externally adjustable Remote delay

s Internal Precision Voltage Reference (Vref1)

s PWM GENERATOR :

s Error Amplifier (easy compensation)

s Oscillator (adjustable frequency)

s PWM generation

s Soft Start & Dead Time Control (adjustable)

s Open collector outputs for indirect Pulse

Transformer driving

s Precision Voltage Reference (Vref2) (Uncom-

mitted with Vref1)

DESCRIPTION

The TSM121 integrated circuit incorporates all

sensing circuit to regulate and protect from over

voltage, under voltage and over current a multiple

output power supply (12V, 5V, 3.3V).

TSM121 incorporates all the necessary functions

for proper PWM generation and pulse transformer

drive to be adapted easily in the PC SMPS power

supplies, and all the Housekeeping features which

allow safe operation in all conditions, and very

high integration.

TSM121 integrates two independent Voltage Ref-

erences which are uncommitted to ensure safe

Regulation and Protection by the same chip.

APPLICATION

s Primary PWM and secondary housekeeping

in PC/Server SMPS using Half Bridge topol-

ogy

ORDER CODE

N = Dual in Line Package (DIP)

PIN CONNECTIONS (top view)

Part

Number

Temperature

Range

Package

Marking

N

TSM121C

0 to 85°C

•

TSM121C

N

DIP24 shrink

(Plastic Package)

VCC

FB

IN-

IN+

OSC

REM

TREM

TPG

PG

IS12

VS33

VS5

VS12

PI

TUV

EP

TSUR

GND

VREF2

SS/DTC

10

9

8

7

6

5

4

3

2

1

11

12

13

14

15

16

17

18

19

20

21

22

23

24

C2

C1

IS5

IS33

TSM121

SINGLE CHIP PWM & HOUSEKEEPING IC

FOR HALF BRIDGE SMPS

January 2001

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