LAB

SEME

IP1524 SERIES

Prelim. 3/95

V

R

C

+5V TO ALL

INTERNAL CIRCUITRY

INV.

INPUT

ERROR

AMP

REFERENCE

REGULATOR

OSCILLATOR

OSCILLATOR

OUTPUT

FLIP

FLOP

COMPARATOR

+5V

NOR

NOR

SHUTDOWN

C

E

C

E

+5V

C.L.

N.I.

INPUT

GND

(SUBSTRATE)

COMPENSATION

+SENSE

–SENSE

+5V

4

9

5

1

2

8

10

IN

T

T

15

6

7

A

A

B

B

12

11

13

14

16

3

1k

Ω

10k

Ω

+8 to +40V

0 to +40V

+1.8 to +3.4V

0 to 100mA

0 to 20mA

30

µA to 2mA

50Hz to 500kHz

1.8k

Ω to 100kΩ

1nF to 0.1

µF

–55 to +125°C

-25 to +85°C

0 to +70°C

RECOMMENDED OPERATING CONDITIONS

DESCRIPTION

The IP1524 series of PWM switching regulator control circuits contains all the functions required to implement single-

ended or push-pull switching regulators. Included are voltage reference, error amplifer, oscillator, PWM comparator,

output drivers, current limiting and shutdown circuitry.

Although functionally indentical to the SG1524 series, SEMELAB has incorporated several improvements to the IP1524

allowing tighter and more complete specification of electrical performance.

BLOCK DIAGRAM

Input Voltage

Collector Voltage

Error Amp Common Mode Range

Output Current

(each transistor)

Reference Load Current

Oscillator Charging Current

Oscillator Frequency Range

Oscillator Timing Resistor

Oscillator Timing Capacitor

Operating Ambient Temperature Range

IP1524

IP2524

IP3524