AP431/AP431A

ADJUSTABLE PRECISION SHUNT REGULATOR

AP431/AP431A Rev. 5

5 of 14

MARCH 2007

www.diodes.com

PARAMETER

TEST CONDITIONS

SYMBOL

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 8)

Ta = Full range (Fig.1)

⎯

8.0

20

mV

⎯

-1.4

-2.0

mV/V

Ratio of the change in Reference voltage to

the change in Cathode voltage

⎯

-1

-2

mV/V

Reference input current

⎯

1.4

3.5

µA

Deviation of Reference input current over

temperature

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

Dynamic output impedance (Note 9)

Frequency

⎯

0.2

0.5

Ω

Temperature

range. The average temperature coefficient of the reference input voltage

1

2

6

REF

DEV

REF

T

T

10

)

C)

(25

V

V

(

V

−

⋅

°

=

α

……………………..……………….. (

)

C

ppm

°

Where:

T2 – T1 = full temperature change.

KA

KA

KA

I

V

Z

∆

∆

=

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

+

∆

∆

=

≈