AP431/AP431A
Adjustable Precision Shunt Regulator
PULSE RESPONSE
6
T
A
=25
o
C
5
Input and Output Voltage-V
Input
220Ω
Output
4
Pulse
Generator
f=100kHz
50Ω
3
Output
GND
2
TEST CIRCUIT FOR PULSE RESPONSE
1
0
-1
0
1
2
3
t-Time-µ S
4
5
6
7
STABILITY BOUNDARY CONDITIONS
†
100
A V
KA
=V
ref
90
80
I
KA
-Cathode Current-mA
70
60
50
40
30
20
10
0
0.001
0.01
0.1
1
C
L
-Load Capacitance-µF
10
C
L
R2
150Ω
I KA
C
L
TA=25
o
C
B V
KA
=5V
C V
KA
=10V
D V
KA
=15V
B
Stable
+
-
V
BATT
Stable
A
C
TEST CIRCUIT FOR CURVE A
D
R1=10KΩ
I KA
150Ω
+
-
V
BATT
The areas under the curves represent conditions that may cause the
device to oscillate. For curves B, C, and D, R2 and V+ were adjusted
to establish the initial V
KA
and I
KA
conditions with C
L
=0.V
BATT
and
C
L
were then adjusted to determine the ranges of stability.
TEST CIRCUIT FOR CURVE B, C, AND D
Anachip Corp.
www.anachip.com.tw
8/17
Rev.1.0 May.7, 2004
ANACHIP [ ANACHIP CORP ]
