NCP4523
http://onsemi.com
7
1
3
2
4
8
6
7
5
V
OUT1
−
+
Current Limit
(Pin numbers of this block diagrams are applied to NCP4523 Series)
V
ref
−
+
Current Limit
V
ref
−
+
Current Limit
Error
V
ref
Amp.Error Amp.
Error Amp.
Error Amp.
V
OUT2
V
OUT3
GND
V
DD
CE1
CE2
CE3
R1_1
R2_1
R1_2
R2_2
R1_3
R2_3
Figure 2. Operation
Fluctuation of each regulator’s output voltage, or
V
OUT1,
2,
3
is detected individually. Then it is put back to
an error amplifier through feedback resistors, or R1_1,
R2_1, R1_2, R2_2, R1_3, R2_3 and compared with a
reference voltage and compensated for the result and
make a constant voltage.
In each regulator, short protection is made with a current
limit circuit and standby mode is available by a chip enable
circuit.
