RN5RT
OPERATION
VDD
2
3
VOUT
R1
R2
+
–
Current Limit
Vref
1
GND
5
CE
In these ICs, Output Voltage VOUT is detected by Feed-back Registers R1, R2, and the detected Output Voltage is
compared with a reference voltage by Error Amplifier, so that a constant voltage is output.
A current limit circuit working for Short Protect and a chip enable circuit for standby function are included.
TEST CIRCUITS
IOUT
ISS→
2
5
2
5
3
3
VDD
VOUT
VDD
VOUT
C1
A
CE
CE
VIN
C1
C2
GND
GND
1
1
C1=1µF
C1, C2=1µF
Fig.1 Standard Test Circuit
Fig.2 Supply Current Test Circuit
IOUT
2
5
3
VDD
VOUT
P.G.
CE
VIN
C1
GND
1
C1=1µF
Fig.3 Line Transient Response Test Circuit
10
RICOH [ RICOH ELECTRONICS DEVICES DIVISION ]
