Adjustable Precision Shunt Regulator
Typical Performance Characteristics
SMALL-SIGNAL VOLTAGE AMPLIFICATION vs. FREQUENCY
60
Electronics Corp.
AP432
A
V
-Small Signal Voltage Amplification (dB)
50
40
30
20
10
0
1K
10K
I
KA
=10mA
T
A
=25
o
C
15KΩ
9µF
Output
I
KA
232Ω
+
8.25KΩ
-
TEST CIRCUIT FOR VOLTAGE AMPLIFICATION
f-Frequency-Hz
100K
1M
10M
REFERENCE IMPEDANCE vs. FREQUENCY
100
∣ZKA∣—Reference
Impedance
—Ω
I
KA
=10mA
T
A
=25
o
C
10
50Ω
-
+
1
TEST CIRCUIT FOR REFERENCE IMPEDANCE
0.1
1K
10K
100K
1M
10M
f-Frequency-Hz
STABILITY BOUNDARY CONDITIONS
†
100
90
80
I
KA
-Cathode Current-m
A
A V
KA
=V
ref
B V
KA
=5V
C V
KA
=10V
D V
KA
=15V
B
TA=25 C
o
70
60
50
40
30
20
10
0
0.001
0.01
0.1
1
C
L
-Load Capacitance-µF
D
Stable
Stable
C
L
C
A
TEST CIRCUIT FOR CURVE A
C
L
R2
10
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
Advanced Power Electronics Corp.
www.a-power.com.tw
-
1KΩ
150O
I KA
+
GND
Output
I KA
GND
+
-
V
BATT
I KA
R1=10KO
150O
+
-
V
BATT
5
A-POWER [ ADVANCED POWER ELECTRONICS CORP. ]
