AP432/AP432A
Adjustable Precision Shunt Regulator
VMAX
VDEV = VMAX - VMIN
VMIN
TI
T2
TEMPERATURE
Note 3. 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:
V
6
DEV
(25°C)
(
)×10
V
REF
ppm
……………………..……………….. (
αV
=
)
REF
°C
T − T
2
1
Where:
T2 – T1 = full temperature change.
αVREF can be positive or negative depending on whether the slope is positive or negative.
Note 4. The dynamic output impedance, RZ, is defined as:
∆VKA
∆IKA
ZKA
=
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:
∆v
∆i
R1
R2
'
ZKA
=
≈ZKA (1+
)
Test Circuits
Input
IN
IN
VKA
IKA
VKA
IKA
VKA
R1
R2
I
REF
VREF
I
Z(OFF)
V
REF
R1
R2
VKA = VREF (1 +
) + IREF ⋅R1
Fig1. Test Circuit for VKA= VREF
Fig2. Test circuit for VKA＞VREF
Fig3. Test Circuit for off-state Current
Anachip Corp.
www.anachip.com.tw
Rev.1.0 May.7, 2004
5/16
ANACHIP [ ANACHIP CORP ]
