LAB

SEME

IP1543 SERIES

Prelim. 1/96

U.V. INDICATE

9

7

U.V.

V

IN

U.V. DELAY

8

250

µA

U.V. SENSE

15

V

REF

O.V. DELAY

5

250

µA

O.V.

16

V

IN

2.5 V REF.

14

GND

6

O.V. SENSE

SCR TRIGGER

1

O.V. INDICATE

4

REMOTE

ACTIVATE

2

RESET

3

C.L. OUTPUT

13

C.L.

10

C.L. INV.

V

IN

OFFSET / COMP

12

11

C.L. NON–INV.

+4.5 to +40V

0 to 10mA

0 to 10mA

–55 to +125°C

0 to +70°C

RECOMMENDED OPERATING CONDITIONS

Input Supply Voltage

Input Voltage Range

Reference Load Current

Indicate Output Current

Operating Ambient Temperature Range

IP1543

IP3543

DESCRIPTION

The IP1543 and IP3543 power supply supervisory circuits contain all the functions necessary to monitor and control the

output of a sophisticated power supply system. Included on the chip are over-voltage (O.V.) sensing with externally

programmable delay used to trigger an external SCR “Crowbar”, under-voltage (U.V.) sensing with externally

programmable delay used to sense either the power supply output or the line input voltage, a third op-amp/comparator

with provision for external compensation and/or offset programming used for either current limiting or as an additional

voltage monitor, and a voltage reference trimmed to ±1%.

BLOCK DIAGRAM