TSM111

10/17

SUPERVISORY CIRCUIT OPERATION

The system power ON/OFF logic is generated by

the PC, which is “Low” in system “On” condition

and “High” when the system is “Off”. This is con-

nected to remote pin 7.

The IC’s internal logic circuit generates a control

signal on pin 6. In normal operation, when there is

no over voltage or over current at the three inputs,

the voltage on pin 6 follows the Remote pin 7 volt-

age, i.e. if the remote pin 7 is low the pin 6 is also

low or vice versa.

When fault is detected on the inputs, control pin 6

goes “High”. This control pin 6 output can be used

to turn off the Mains Power Supply during fault

condition. An optocoupler is connected directly,

with cathode connected to the IC pin 6 and anode

to 5V (from STDBY supply).

In normal operation the voltage on pin 6 is (opto

cathode) is around 3.7 V. On the primary side the

opto transistor collector is pulled through a resistor

to Vref.

It is required to invert the signal before connecting

to the feedback compensation pin 6 of L5991A for

reverse logic. i.e during normal operation the com-

pensation pin is not affected and during fault con-

dition the pin is pulled Low. Slight delay (R34,C32)

is introduced on the primary side to avoid fault turn

on condition.

Note : Once the fault condition is removed, it is required to reset the

Remote pin to make the system function again.

BILL OF MATERIAL

The following are the bill of material for the 90W SMPS :

No

Part Number

Qt

Manufacturers

Remarks / Descriptions

ICs

1

L5991A

1

ST

Advanced PWM Controller

2

VIPer20 DIP

1

ST

Aux controller PWM+Mos

3

TSM111

1

ST

Triple Voltage and Current Supervisor

4

LM7912CV

1

ST

-12V Post Regulator

5

TL431

1

ST

Programmable Voltage Reference

MOSFETS

6

STP6NB80

1

ST

TO220 6A, 800V Mos

7

STP3020L

1

ST

TO220 22mohm 33V Mos

Rectifiers

8

BYV10-40

1

ST

1A, 40V or BYV10-60 or BYW100-200

9

BYW100-200

3

ST

1A, 100V or 200V, BYW100-100

10

STPS20L40CT

1

ST

2x10A, 40V or STPS2045CT or

STPS30L40CT

11

STSPS10L40CT

1

ST

2x5A, 40V

12

KAL04

1

-

3Amp 400VAC Bridge Rectifier or higher

13

1N4148

1

-

Transformers / Inductors

12

HM00-98 150

1

BI Tech. **

Aux Transformer

13

HM00-98151

1

BI Tech.

Main Transformer

14

HM00-98 148

1

BI Tech.

Coupled inductors

15

HM50-150K

1

BI Tech.

15uH inductors - output filter

16

HM11-51502

1

BI Tech.

2.2uH inductors - output filter

17

HM28-32022

1

BI Tech.

Common Mode choke - AC input filter

18

10uH

1

-

10uH inductors - output filter

Connectors

19

AC input conn

1

-

20

20-pin conn:

39-02-2200

1

Molex

20 pin output connector with terminals

Molex 39-00-0038

21

Fann connector

1

-

22

Fuse 3.5A

1

-

23

NTC

1

Siemens

2.2 ohm

24

TLP621 Optocoupler

3

Toshiba

100% transfer ratio

25

AC switch

1

-

26

115V-23oV selector

1

-