AP432/AP432A

ADJUSTABLE PRECISION SHUNT REGULATOR

AP432/AP432A

Document number: DS31003 Rev. 16 - 2

6 of 14

www.diodes.com

June 2010

© Diodes Incorporated

+

-

Output

GND

15K

Ω

8.25K

Ω

9

μF

I

KA

232

Ω

Test Circuit for Voltage Amplification

Small-Signal Voltage Amplification vs Frequency

0

10

20

30

40

50

60

1K

10K

100K

1M

10M

f-Frequency-Hz

I

T

+

-

I KA

GND

Output

1K

Ω

50

Ω

Test Circuit for Reference Impedance

Reference Impedance vs Frequency

0.1

1

10

100

1K

10K

100K

1M

10M

f-Frequency-Hz

T =25 C

A

o

+

-

150

Ω

I KA

Test Circuit for Curve A

+

-

R1=10K

Ω

R2

I KA

150

Ω

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