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AP431A Datasheet PDF : 14 Pages
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AP431/AP431A
ADJUSTABLE PRECISION SHUNT REGULATOR
Electrical Characteristics ( TA = 25oC, V+ = +5.0V, unless otherwise stated )
PARAMETER
Reference voltage
Deviation of Reference input voltage over
temperature (Note 8)
Ratio of the change in Reference voltage to
the change in Cathode voltage
Reference input current
Deviation of Reference input current over
temperature
Minimum Cathode current for regulation
Off-state current
Dynamic output impedance (Note 9)
TEST CONDITIONS
VKA = VREF,
I KA = 10mA (Fig.1)
VKA = VREF, IKA = 10mA,
Ta = Full range (Fig.1)
AP431
AP431A
IKA = 10mA (Fig. 2)
VKA = 10V ~VREF
VKA= 36V ~10V
R1 = 10KΩ,R2 = ∞ IKA= 10mA (Fig. 2)
R1 = 10KΩ,R2 = ∞ IKA = 10mA
Ta = Full range (Fig. 2)
VKA = VREF (Fig.1)
VKA = 36V, VREF = 0V (Fig. 3)
V KA = VREF V KA = VREF
∆IKA = 0.1mA ~ 15mA
Frequency ≤ 1KHz (Fig.1)
SYMBOL MIN. TYP. MAX. UNIT
VREF
2.470
2.482
2.495
2.520
2.507
V
VREF
⎯ 8.0 20 mV
∆VREF
∆VKA
IREF
⎯ -1.4 -2.0 mV/V
⎯
-1
-2 mV/V
⎯ 1.4 3.5 µA
αIREF
⎯ 0.4 1.2 µA
IKA(MIN)
IKA(OFF)
⎯ 0.19 0.5 mA
⎯ 0.1 1.0 µA
|ZKA|
⎯ 0.2 0.5 Ω
VMAX
VMIN
VDEV = VMAX - VMIN
TI
Temperature
T2
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:
( 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.
Note: 9. The dynamic output impedance, RZ, is defined as:
Z KA
= ∆VKA
∆ 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 '
=
∆v
∆i
≈ZKA
(1+ R1)
R2
AP431/AP431A Rev. 5
5 of 14
www.diodes.com
MARCH 2007
© Diodes Incorporated
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