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AP431AQ

ADJUSTABLE PRECISION SHUNT REGULATOR

Diodes Incorporated. 

AP431/AP431A

ADJUSTABLE PRECISION SHUNT REGULATOR

Electrical Characteristics (TA = 25oC, V+ = +5.0V, unless otherwise stated)

Symbol

VREF

VREF

ΔVREF

ΔVKA

IREF

αIREF

IKA(MIN)

IKA(OFF)

|ZKA|

Parameter

Test Conditions

Reference voltage

VKA = VREF,

AP431

I KA = 10mA (Fig.1) AP431A

Deviation of Reference input

voltage over temperature

(Note 4)

VKA = VREF, IKA = 10mA,

Ta = Full range (Fig.1)

Ratio of the change in

VKA = VREF to10V

Reference voltage to the

change in Cathode voltage

IKA = 10mA (Fig. 2)

VKA = 10V to 36V

Reference input current

R1 = 10KΩ,R2 = ∞ IKA= 10mA (Fig. 2)

Deviation of Reference input R1 = 10KΩ,R2 = ∞ IKA = 10mA

current over temperature Ta = Full range (Fig. 2)

Minimum Cathode current

for regulation

VKA = VREF (Fig.1)

Off-state current

Dynamic output impedance

(Note 5)

VKA = 36V, VREF = 0V (Fig. 3)

V KA = VREF V KA = VREF

ΔIKA = 0.1mA ~ 15mA

Frequency ≤ 1KHz (Fig.1)

Min Typ. Max Unit

2.470

2.482

2.495

2.520

2.507

V

⎯ 8.0 20 mV

⎯ -1.4 -2.0 mV/V

⎯ -1 -2 mV/V

⎯ 1.4 3.5 μA

⎯ 0.4 1.2 μA

⎯ 0.19 0.5 mA

⎯ 0.1 1.0 μA

⎯ 0.2 0.5 Ω

VMAX

VMIN

VDEV = VMAX - VMIN

TI

Temperature

T2

Notes: 4. Deviation of reference input voltage, VDEV, is defined as the maximum variation of the reference over the full temperature range.

The average temperature coefficient of the reference input voltage αVREF is defined as:

( VDEV ) ⋅10 6

α VREF =

VREF (25°C)

T2 − T1

……………………..………..…………….. ( ppm°C )

Where:

T2 – T1 = full temperature change.

αVREF can be positive or negative depending on whether the slope is positive or negative.

Notes: 5. The dynamic output impedance, RZ, is defined as:

Z KA

= ΔVKA

Δ IKA

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:

ZKA '

=

Δv

Δi

≈ZKA

(1+ R1)

R2

AP431/AP431A

Document number: DS31002 Rev. 15 - 2

4 of 16

www.diodes.com

June 2010

© Diodes Incorporated

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