34063

Description

The MC34063A Series is a monolithic control circuit containing the primary functions required for DC-to-DC converters.

These devices consist of an internal temperature compensated reference, comparator, controlled duty cycle oscillator

with an active current limit circuit, driver and high current output switch. This series was specifically designed to be

incorporated in Step-Down and Step-Up and Voltage-Inverting applications with a minimum number of external

components.

Features

• Operation from 3.0 V to 40 V Input

• Low Standby Current

• Current Limiting

• Output Switch Current to 1.5 A

• Output Voltage Adjustable

• Frequency Operation to 100 kHz

• Precision 2% Reference

Plastic Package

Pin Connections

Internal Block Digram

Driver

Collector

8

1

Switch

Collector

S

Q

Q2

Ipk

Sense

VCC

Comparator

Inverting

Input

7

6

5

Ipk

Oscillator

Comparator

CT

R

100

1.25 V

Reference

Q1

2

3

4

Switch

Emitter

Timing

Capacitor

Gnd

1

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