LAB

SEME

IP1526A SERIES

Prelim. 6/95

Q

T

Q

TOGGLE

F/F

S

Q

R

MEMORY

F/F

17

15

18

12

D

S Q

Q

METERING

F/F

5

4

2

1

9

10

T

C

11

3

6

OSCILLATOR

T

R

SYNC

UNDER

VOLTAGE

LOCKOUT

REFERENCE

REGULATOR

GND

TO INTERNAL

CIRCUITRY

REF

V

IN

+V

D

R

SOFT-

START

C

RESET

COMPEN-

SATION

+ERROR

–ERROR

7

–C

S

SHUTDOWN

8

AMP

OUTPUT

A

OUTPUT

B

13

16

14

+8 to +35V

+4.5 to +35V

0 to 100mA

–5 to 20mA

1Hz to 400kHz

2k

Ω to 150kΩ

470pF to 20

µF

3% to 50%

–55 to +125°C

0 to +70°C

RECOMMENDED OPERATING CONDITIONS

Input Voltage

Collector Voltage

Sink/Source Load Current (Each Output)

Reference Load Current

Oscillator Frequency Range

Oscillator Timing Resistor

Oscillator Timing Capacitor

Available Deadtime Range @ 40kHz

Operating Ambient Temperature Range

IP1526A

IP3526A

DESCRIPTION

The IP1526A series of high performance pulse width modulator circuits is a direct replacement for the IP1526 series in all

applications and features improved performance in several key areas. Functions included are a temperature compensated voltage

reference, sawtooth oscillator, error amplifier, PWM comparator, pulse metering and steering logic, and two low impedance power

drivers. Also included are protective features such as soft-start, undervoltage lockout, digital current limiting, double pulse inhibit, a

data latch for single pulse metering, adjustable dead-time and provision for symmetry correction inputs. For ease of interface, all digital

control ports are TTL and 9-series CMOS compatible. Active LOW logic design allows wired-OR connections for maximum flexibility.

This versatile device can be used to implement single-ended or push-pull switching regulators of either polarity, both transformerless

and transformer coupled .

BLOCK DIAGRAM