AP431/AP431A
Adjustable Precision Shunt Regulator
Note 3. Deviation of reference input voltage, V
DEV
, 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:
α
V
REF
V
DEV
)
⋅
10
6
V (25
°
C)
……………………..……………….. (
ppm
)
=
REF
°
C
T
2
−
T
1
(
Where:
T2 – T1 = full temperature change.
αV
REF
can be positive or negative depending on whether the slope is positive or negative.
Note 4. The dynamic output impedance, R
Z
, is defined as:
Z
KA
=
∆
V
KA
∆
I
KA
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:
Z
KA
=
'
∆
v
≈
Z
KA
∆
i
(1
+
R1
)
R2
Test Circuits
Input
IN
IN
V
KA
I
KA
R1
V
REF
I
REF
V
REF
I
KA
V
KA
V
KA
R2
I
Z(OFF)
Note:V
KA
=V
REF
(1+R1/R2)+I
REF×
R1
Fig1. Test Circuit for V
KA
= V
REF
Fig2. Test circuit for V
KA
＞
V
REF
Fig3. Test Circuit for off-state Current
Anachip Corp.
www.anachip.com.tw
5/17
Rev.1.0 May.7, 2004
ANACHIP [ ANACHIP CORP ]
