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TSM121

SINGLE CHIP PWM & HOUSEKEEPING IC FOR HALF BRIDGE SMPS

STMicroelectronics 

TSM121

PIN DESCRIPTION

Name

Vcc

Gnd

Vs12

Vs5

Vs33

Tuv

EP

Is12

Is5

Is33

PI

PG

Tpg

REM

Trem

Tsur

Vref2

IN+

IN-

FB

OSC

SS/DTC

C1

C2

Pin #

Type

Function

2 Power Supply

21 Power Supply

Positive Power Supply line.

Ground. 0V Reference for all voltages.

Housekeeping

15 Analog input

14 Analog input

13 Analog input

18 Timing capacitor

16 Analog input

10 Analog input

11 Analog input

12 Analog input

17 Analog input

9 Open Collector

8 Timing capacitor

6 TTL input

7 Timing capacitor

19 Analog input

Over & under voltage sense input dedicated to the 12V line

Over & under voltage sense input dedicated to the 5V line

Over & under voltage sense input dedicated to the 3.3V line

Adjustable Under voltage blanking delay at Power Up (setting capacitor)

Extra Protection (Over voltage for -5V and/or -12V line or Primary

OverPower protection). If this extra Protection circuit is not used, pin EP

should be connected to Vref2

Over current sense input dedicated to the 12V line

Over current sense input dedicated to the 5V line

Over current sense input dedicated to the 3.3V line

Power Good input. This pin detects the power conditions.

Power Good output. PG output is High when the power conditions are OK.

Adjustable Power Good delay (setting capacitor)

Input Remote control of the complete system by the motherboard

(µController). Remote is active high. Switch OFF/ON of the Power Supply.

Reset of the complete system after a FAULT activation.

Adjustable Remote delay (setting capacitor)

Inrush Current Blank (surge) setting resistor and capacitor input. Avoids

that the Housekeeping protection latches on normal start up surge

conditions.

PWM

20 Voltage Reference Voltage Reference for all the PWM section. Vref2 is uncommitted to Vref1

(Housekeeping section). Vref2 should be connected to a decoupling

capacitor (0.1µF)

5 Opamp input

Positive Input of the error amplifier

4 Opamp input

Negative Input of the error amplifier

3 Feedback

Feedback input of the error amplifier

22 Timing capacitor Frequency setting capacitor input

23 Analog input

Soft Start. Imposes progressive increase of the switching duty cycle to

avoid current inrush at power up. When SS/DTC is high, duty cycle is low.

When SS/DTC is low, duty cycle is high. Dead Time Control. Limits the

maximum duty cycle to a programmable level using appropriate external

bridge resistor.

1 Open Collector

Output Drive (to Pulse Transformer. Open Collector 1)

24 Open Collector

Output Drive (to Pulse Transformer. Open Collector 2)

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