AP431/AP431A

ADJUSTABLE PRECISION SHUNT REGULATOR

AP431/AP431A

Document number: DS31002 Rev. 15 - 2

8 of 16

www.diodes.com

June 2010

© Diodes Incorporated

Pulse Response

0

1

2

3

4

5

6

-1

0

1

23

45

67

t-Time-

μS

Input

Output

GND

Output

220

Ω

50

Ω

Test Circuit for Pulse Response

Pulse

Generator

f=100kHz

T

+

-

150?

I KA

Test Circuit for Curve A

+

-

R1=10K?

R2

I KA

150?

Test Circuit for Curve B, C, and D

+ The areas under the curves represent conditions that may cause the

device to oscillate. For curves B, C, and D, R2 and V+ were adjusted

were then adjusted to determine the ranges of stability.

STABILITY BOUNDARY CONDITIONS

†

0

10

20

30

40

50

60

70

80

90

100

0.001

0.01

0.1

1

10

A

B

C

D

Stable

Stable

TA=25