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AN6531 Datasheet(PDF) 4 Page - Panasonic Semiconductor

Part No. AN6531
Description  4-pin variable positive output voltage regulator
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Maker  PANASONIC [Panasonic Semiconductor]
Homepage  http://www.panasonic.com/industrial/
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AN6531 Datasheet(HTML) 4 Page - Panasonic Semiconductor

   
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AN6531
Voltage Regulators
4
I Basic Regulator Circuit
I Application Circuit Examples
1. Current bootstrap circuit
2. Current bootstrap circuit
(with current limiting circuit)
+V
O
VO
= Vcont
CI is necessary when the VI line is long.
CO improves the transient response.
4
3
1
2
CO
0.1
µF
0.33
µF
Vcont
CI
+V
1
AN6531
R1
R2
Cont
Input Output
Common
R1
R1
+ R2
(Vcont
≅ 5V, R1 = 5kΩ)
VO
1
2
4
3
0.33
µF
0.1
µF
VI
IO
IP
IR
R3 =
VBE(Q1) ·
β
(
β + 1) IP − IO
R3
R2
R1
6
5k
Cont
Input
Output
Common
Q1
AN6531
VO
1
2
4
3
0.33
µF
0.1
µF
VI
IO
IP
IR
Ie2
Ie1
RSC
=
VBE(Q2)
Ie1(max)
R3
=
VBE(Q1)
+ Ie1RSC
IO
− Ie1
Ie2(max)
= IP(max)
VBE(Q1)
+ VBE(Q2)
R3
R3
RSC
R2
R1
5k
Cont
Input Output
Common
Q1
Q2
AN6531
6


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