KA78R12 Datasheet, PDF (1/8 Pages) Samsung semiconductor – LOW DROPOUT VOLTAGE REGULATOR

KA78R12
Low Dropout Voltage Regulator
www.fairchildsemi.com
Features
• 1A / 12V Output low dropout voltage regulator
• TO220 Full-Mold package (4PIN)
• Overcurrent protection, Thermal shutdown
• Overvoltage protection, Short-Circuit protection
• With output disable function
Description
The KA78R12 is a low-dropout voltage regulator suitable
for various electronic equipments. It provides constant volt-
age power source with TO-220 4 lead full mold package.
Dropout voltage of KA78R12 is below 0.5V in full rated
current(1A). This regulator has various function such as
peak current protection, thermal shut down, overvoltage pro-
tection and output disable function.
TO-220F-4L
Internal Block Diagram
Vin 1
THERMAL SHUTDOWN
BANDGAP REFERENCE
HIGH / LOW
Vdis 4
-
+
OUTPUT
ON / OFF
1.4V
1
1. Vin 2. Vo 3. GND 4. Vdis
OVERVOLTAGE
PROTECTION
-
+
SOA PROTECTION
Q1
R1
R2
SHSOHROTR-TCCIRIRCCUUIT
PROTECTION
2 Vo
3
GND
©2001 Fairchild Semiconductor Corporation
Rev. 1.0.1