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AP432 Datasheet PDF : 12 Pages
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AP432/AP432A
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)
Test conditions
VKA = Vref,
I KA = 10mA (Fig.1)
AP432
AP432A
VKA = VREF , IKA = 10mA ,
Ta = full range (Fig.1)
Ratio of the Change in Reference Voltage to IKA = 10mA
the Change in Cathode Voltage
(Fig.2)
VKA = 20 ~VREF
Reference Input Current
Deviation of Reference Input Current over
Temperature
Minimum Cathode Current for Regulation
Off-state Current
Dynamic Output Impedance (Note 9)
R1 = 10KΩ,R2 = ∞
IKA= 10mA (Fig.2)
R1 = 10KΩ,R2 = ∞
IKA = 10mA
Ta = Full range (Fig.2)
VKA = VREF (Fig.1)
VKA = 20V , VREF = 0V (Fig.3)
V KA = VREF
Frequency ≤ 1KHz (Fig.1)
Symbol
VREF
VREF
∆VREF
∆V
KA
IREF
αIREF
IKA(min)
IKA(off)
Z KA
Min.
1.227
1.233
Typ.
1.24
3.0
-1.4
1.4
0.4
0.15
0.1
0.2
Max. Unit
1.252
1.246
V
20
mV
-2.0 mV/V
3.5
µA
1.2
µA
0.3
mA
1.0
µA
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
AP432/AP432A Rev. 6
5 of 12
www.diodes.com
MARCH 2007
© Diodes Incorporated
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