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
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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
1
S
R
I
pk
Sense
I
pk
Oscillator
Comparator
1.25 V
Reference
4
Gnd
C
T
7
100
2
3
V
CC
Comparator
Inverting
Input
6
Switch
Emitter
Timing
Capacitor
Q
Q2
Q1
8
Switch
Collector
5
BEIJING ESTEK ELECTRONICS CO.,LTD
1
ESTEK [ Estek Electronics Co. Ltd ]
