AP431/AP431A

ADJUSTABLE PRECISION SHUNT REGULATOR

AP431/AP431A

Document number: DS31002 Rev. 15 - 2

4 of 16

www.diodes.com

June 2010

© Diodes Incorporated

Symbol

Parameter

Test Conditions

Min

Typ.

Max

Unit

Reference voltage

AP431

AP431A

2.470

2.482

2.495

2.520

2.507

V

Deviation of Reference input

voltage over temperature

(Note 4)

Ta = Full range (Fig.1)

⎯

8.0

20

mV

ΔV

REF

ΔV

KA

Ratio of the change in

Reference voltage to the

change in Cathode voltage

⎯

-1.4

-2.0

mV/V

⎯

-1

-2

mV/V

Reference input current

R1 = 10K

Ω,R2 = ∞ I

⎯

1.4

3.5

μA

αI

REF

Deviation of Reference input

current over temperature

R1 = 10K

Ω,R2 = ∞ I

Ta = Full range (Fig. 2)

⎯

0.4

1.2

μA

Minimum Cathode current

for regulation

⎯

0.19

0.5

mA

Off-state current

⎯

0.1

1.0

μA

|Z

Dynamic output impedance

(Note 5)

ΔI

Frequency

⎯

0.2

0.5

Ω

Temperature

The average temperature coefficient of the reference input voltage

αV

1

2

6

REF

DEV

REF

T

T

10

)

C)

(25

V

V

(

V

−

⋅

°

=

α

……………………..………..…………….. (

)

C

ppm

°

Where:

T2 – T1 = full temperature change.

αV

Notes:

KA

KA

KA

I

V

Z

Δ

Δ

=

When the device is programmed with two external resistors R1 and R2 (see Figure 2.), the dynamic output impedance of the overall

circuit, is defined as:

)

R2

R1

(1

Z

i

v

Z

KA

'

KA

+

Δ

Δ

=

≈