KA34063ADTF Datasheet, PDF (1/6 Pages) Fairchild Semiconductor – Operation From 3.0 to 40V Input

KA34063A
SMPS Controller
www.fairchildsemi.com
Features
• Operation From 3.0 to 40V Input
• Short Circuit Current Limiting
• Low Stand-by Current
• Output Switch Current of 1.5A Without External
Transistors
• Output Voltage Adjustable
• Frequency of Operation From 100Hz to 100kHz
• Step-up, Step-Down or Inverting Switching Regulators
Description
The KA34063A is a monolithic regulator sub system
intended for use as DC to DC converter. This device
contains a temperature compensated bandgap reference, a
duty cycle control oscillator, a driver, and a high current
output switch. It can be used for step down, step up or
inverting switching regulators as well as for series pass
regulators.
8-DIP
1
8-SOP
1
Internal Block Diagram
1.25V
REF
VTG
COMP
5
COMPARATOR
INVERTING
INPUT
4
IPK SENSE ₇
GND
TIMING
3
CAPACITOR
* VCC(6)
OSCILLATOR
DRIVE
SWITCH
COLLECTOR COLLECTOR
81
S
Q
Q2
Q1
RD
R
2
©2002 Fairchild Semiconductor Corporation
Rev. 1.0.1