Harman Kardon AVR 254, Service Manual

Page: 141 / 189

NJM2845/46
Ver.2005-01-20
LOW DROPOUT VOLTAGE REGULATOR
GENERAL DESCRIPTION PACKAGE OUTLINE
The NJM2845 is low dropout voltage regulator. Advanced
Bipolar technology achieves low noise, high ripple rejection
and low quiescent current.
NJM2845 is 3 terminal type and NJM2846 is ON/OFF control
built in type. These product can be selected according to the
applications.
FEATURES
High Ripple Rejection 75dB typ. (f=1kHz,3V Version)
Output Noise Voltage Vno=45
µ
Vrms typ. (Vo=3V Version)
Output capacitor with 2.2
µ
F ceramic capacitor (Vo
≥
2.6V)
Output Current Io(max.)=800mA
High Precision Output Vo
±
1.0%
Low Dropout Voltage 0.18V typ. (Io=500mA)
ON/OFF Control (NJM2846)
Internal Short Circuit Current Limit
Internal Thermal Overload Protection
Bipolar Technology
Package Outline
TO-252-3 (NJM2845DL1), TO-252-5 (NJM2846DL3)
PIN CONFIGURATION
NJM2845DL1 NJM2846DL3
EQUIVALENT CIRCUIT
V
OUT
Thermal
Protection
Bandgap
Reference
V
IN
GND
V
OUT
Thermal
Protection
Bandgap
Reference
V
IN
Control
GND
1.V
IN
2.GND
3.V
OUT
3 1
2
1.CONTROL
2.V
IN
3.GND
4.Vo
5.NC
NJM2845DL1
NJM2846DL3
NJM2845DL1
NJM2846DL3
1 2 3 4 5
3
141
AVR254
harman/kardon