User guide

AP78L05/08/12
AP78LXX SERIES 3-TERMINAL POSITIVE REGULATORS
AP78L05/08/12
Document number: DS31054 Rev. 10 - 2
2 of 16
www.diodes.com
March 2012
© Diodes Incorporated
Typical Application Circuit
Fixed Output Regulator
AP78Lxx
OUT
IN
Input Output
GND
C1
0.33µF
†
C2
0.1µF
‡
(†) Required if the regulator is located more than 3” from the power supply filter
(‡) See Note 5 in the electrical characteristics table
Pin Descriptions
Pin Name Description
V
IN
Operating Voltage Input
V
OUT
Voltage Output Pin
GND Ground
NC No Connection
Functional Block Diagram
Introduction
The AP78LXX series is a three terminal device with fixed output voltages from 5V,8V and 12V. The AP78LXX fixed voltage
regulator series has built-in thermal overload protection which prevents the device from being damaged due to excessive
junction temperature. The regulator also contains internal short-circuit protection which limits the maximum output current, and
safe-area protection for the pass transistor which reduces the short-circuit current as the voltage across the pass transistor is
increased.