AP431 datasheet(4/16 Pages) DIODES

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AP431/AP431A

ADJUSTABLE PRECISION SHUNT REGULATOR

AP431/AP431A

Document number: DS31002 Rev. 15 - 2

4 of 16

www.diodes.com

June 2010

Electrical Characteristics (TA = 25

oC, V+ = +5.0V, unless otherwise stated)

Symbol

Parameter

Test Conditions

Min

Typ.

Max

Unit

VREF

Reference voltage

VKA = VREF,

I KA = 10mA (Fig.1)

AP431

AP431A

2.470

2.482

2.495

2.520

2.507

VREF

Deviation of Reference input

voltage over temperature

(Note 4)

VKA = VREF, IKA = 10mA,

Ta = Full range (Fig.1)

⎯

8.0

ΔV

REF

ΔV

Ratio of the change in

Reference voltage to the

change in Cathode voltage

IKA = 10mA (Fig. 2)

VKA = VREF to10V

⎯

-1.4

-2.0

mV/V

VKA = 10V to 36V

⎯

-1

-2

mV/V

IREF

Reference input current

R1 = 10K

Ω,R2 = ∞ I

KA= 10mA (Fig. 2)

⎯

1.4

3.5

μA

αI

REF

Deviation of Reference input

current over temperature

R1 = 10K

Ω,R2 = ∞ I

KA = 10mA

Ta = Full range (Fig. 2)

⎯

0.4

1.2

μA

IKA(MIN)

Minimum Cathode current

for regulation

VKA = VREF (Fig.1)

⎯

0.19

0.5

IKA(OFF)

Off-state current

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

⎯

0.1

1.0

μA

KA|

Dynamic output impedance

(Note 5)

V KA = VREF V KA = VREF

ΔI

KA = 0.1mA ~ 15mA

Frequency

≤ 1KHz (Fig.1)

⎯

0.2

0.5

Ω

VMAX

VMIN

Temperature

VDEV = VMAX - VMIN

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

αV

REF is defined as:

REF

DEV

REF

)

(25

(

−

⋅

……………………..………..…………….. (

)

ppm

Where:

T2 – T1 = full temperature change.

αV

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

Notes:

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

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:

)

≈

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