AP431SA datasheet(5/14 Pages) DIODES

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AP431/AP431A

ADJUSTABLE PRECISION SHUNT REGULATOR

AP431/AP431A Rev. 5

5 of 14

MARCH 2007

www.diodes.com

Electrical Characteristics ( TA = 25

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

PARAMETER

TEST CONDITIONS

SYMBOL

MIN.

TYP. MAX. UNIT

Reference voltage

VKA = VREF,

I KA = 10mA (Fig.1)

AP431

AP431A

VREF

2.470

2.482

2.495

2.520

2.507

Deviation of Reference input voltage over

temperature (Note 8)

VKA = VREF, IKA = 10mA,

Ta = Full range (Fig.1)

VREF

⎯

8.0

VKA = 10V ~VREF

∆VREF

⎯

-1.4

-2.0

mV/V

Ratio of the change in Reference voltage to

the change in Cathode voltage

IKA = 10mA (Fig. 2)

VKA= 36V ~10V

∆VKA

⎯

-1

-2

mV/V

Reference input current

R1 = 10KΩ,R2 = ∞ IKA= 10mA (Fig. 2)

IREF

⎯

1.4

3.5

µA

Deviation of Reference input current over

temperature

R1 = 10KΩ,R2 = ∞ IKA = 10mA

Ta = Full range (Fig. 2)

αIREF

⎯

0.4

1.2

µA

Minimum Cathode current for regulation

VKA = VREF (Fig.1)

IKA(MIN)

⎯

0.19

0.5

Off-state current

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

IKA(OFF)

⎯

0.1

1.0

µA

Dynamic output impedance (Note 9)

V KA = VREF V KA = VREF

∆IKA = 0.1mA ~ 15mA

Frequency

≤ 1KHz (Fig.1)

|ZKA|

⎯

0.2

0.5

Ω

VMAX

VMIN

Temperature

VDEV = VMAX - VMIN

Note: 8. 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:

REF

DEV

REF

)

(25

(

−

⋅

……………………..……………….. (

)

ppm

Where:

T2 – T1 = full temperature change.

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

Note: 9. 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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