TSM121

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PIN DESCRIPTION

Name

Pin #

Type

Function

Vcc

2

Power Supply

Positive Power Supply line.

Gnd

21

Power Supply

Ground. 0V Reference for all voltages.

Housekeeping

Vs12

15

Analog input

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

Vs5

14

Analog input

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

Vs33

13

Analog input

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

Tuv

18

Timing capacitor

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

EP

16

Analog input

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

Is12

10

Analog input

Over current sense input dedicated to the 12V line

Is5

11

Analog input

Over current sense input dedicated to the 5V line

Is33

12

Analog input

Over current sense input dedicated to the 3.3V line

PI

17

Analog input

Power Good input. This pin detects the power conditions.

PG

9

Open Collector

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

Tpg

8

Timing capacitor

Adjustable Power Good delay (setting capacitor)

REM

6

TTL input

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.

Trem

7

Timing capacitor

Adjustable Remote delay (setting capacitor)

Tsur

19

Analog input

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

that the Housekeeping protection latches on normal start up surge

conditions.

PWM

Vref2

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)

IN+

5

Opamp input

Positive Input of the error amplifier

IN-

4

Opamp input

Negative Input of the error amplifier

FB

3

Feedback

Feedback input of the error amplifier

OSC

22

Timing capacitor

Frequency setting capacitor input

SS/DTC

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.

C1

1

Open Collector

Output Drive (to Pulse Transformer. Open Collector 1)

C2

24

Open Collector

Output Drive (to Pulse Transformer. Open Collector 2)