IP1526 SERIES

4/99

8

1

2

3

4

5

6

7

14

13

12

11

10

9

15

16

17

18

V

REF

OUTPUT B

GROUND

OUTPUT A

+ERROR

–ERROR

COMPENSATION

SOFTSTART

C

RESET

+CURRENT SENSE

–CURRENT SENSE

SHUTDOWN

+V

IN

COLLECTOR

+V

SYNC

+8 to +35V

+4.5 to +35V

0 to 100mA

0 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

IP1526

IP3526

DESCRIPTION

The IP1526 and IP3526 high performance monolithic pulse width modulator circuits are designed for fixed-frequency switching

regulators and other power control applications. Included in an 1 8-pin dual-in-line package are a temperature compensated voltage

reference, sawtooth oscillator, error amplifier, pulse width modulator, pulse metering and steering logic, and two low impedance power

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

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

control ports are TTL and B-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