Adjustable Precision Shunt Regulator
V
MAX
V
DEV
= V
MAX
- V
MIN
V
MIN
Advanced Power
Electronics Corp.
AP432
T
I
TEMPERATURE
T
2
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:
(
V
DEV
V
REF (25
°
C)
)
×
10
6
α
V
REF
=
T
2
−
T
1
……………………..……………….. (
ppm
°
C
)
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:
∆
V
KA
Z
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:
'
∆
v
Z
KA
=
≈
Z
KA
∆
i
(
1
+
R1
)
R2
Test Circuits
Input
IN
IN
V
KA
I
KA
R1
I
REF
I
KA
V
KA
V
KA
V
REF
R2
V
REF
I
Z(OFF)
V
KA
=
V
REF
(1
+
Fig1. Test Circuit for V
KA
= V
REF
R1
)
+
I
REF
⋅
R1
R2
Fig3. Test Circuit for off-state Current
Fig2. Test circuit for V
KA
＞V
REF
Advanced Power Electronics Corp.
www.a-power.com.tw
4
A-POWER [ ADVANCED POWER ELECTRONICS CORP. ]
