LR34063 Datasheet, PDF (1/12 Pages) Leshan Radio Company – DC-DC Converter Control Circuits

LESHAN RADIO COMPANY, LTD.
DC-DC Converter
Control Circuits
LR34063
DESCRIPTION:
The LR34063 Series is a monolithic control circuit containing
the primary functions required for DC-to-DC converters.These
devices consist of an internal temperature compensated refe-
rence,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.
DIP-8
FEATURE:
z Operation from 3.0 V to 40 V Input
z Low Standby Current
z Current Limiting
z Output Switch Current to 1.5 A
z Output Voltage Adjustable
z Frequency Operation to 100 kHz
z Precision 2% Reference
SOP-8
ORDERING INFORMATION
Device
LR34063
LR34063D
Package
DIP-8
SOP-8
BLOCK DIAGRAM
Drive ⁸
Collector
Ipk ⁷
Sense
6
VCC
Comparator ⁵
Inverting
Input
S Q ^Q2
R
Q1
100
Ipk
Oscillator
CT
Comparator
+
1.25 V
Reference
–
Regulator
1
Switch
Collector
2 _Switch
Emitter
3 _Timing
Capacitor
4
Gnd
(Bottom View)
PIN CONNECTIONS
Switch
Collector
1
Switch
Emitter
2
Timing ₃
Capacitor
Gnd 4
8
Driver
Collector
7 Ipk Sense
(Top View)
6 VCC
Comparator
5 _Inverting
Input
LR34063-1/12