IP5560C

Prelim. 4/95

REFERENCE

VOLTAGE

STABILISED

SUPPLY

100

Ω

0.48V

4

3

5

SAWTOOTH

GENERATOR

0.6V

6

0.6V

1k

Ω

0.6V

R

S

START

STOP

O1

0.48V

0.6V

LATCH

0.6V

S

R

15

14

FEEDBACK

VOLTAGE

GAIN ADJUST

MODULATOR

INPUT

DUTY CYCLE

CONTROL

CURRENT

LIMITING

11

10

REMOTE

ON/OFF

116

GND

CC

V

2

z

V

Emitter

Collector

OUTPUTS

FEED

FORWARD

T

R

T

C

EXTERNAL

SYNC INPUT

DEMAGNETISATION

OVER-VOLTAGE

PROTECTION

13

9

8

7

16

CC

V

BLOCK DIAGRAM

DESCRIPTION

The IP5560 is a control circuit for use in switched mode power supplies. This single monolithic chip incorporates all the

control and supervisory (protection) functions required in switched mode power supplies, including an internal

temperature compensated reference source, internal reference, sawtooth generator, pulse width modulator, output stage

and various protection circuits.