150 W
IK
Typical Performance CHARACTERISTICS (continued)
R
CL
10kΩ
100
10
TA = 25 °C
IK =1 to 100mA
1.0
0.1
Test Circuit for Stability
0.01
1K
10K
100K
1M
10M
f Frequency (Hz)
Dynamic Output Impedance Ta = 25°C,
Ik = 1 to 100mA
100
10
VKA = 36V
VREF = 0V
1
0.1
0.01
-50
0
50
100
150
TA Ambient Temperature (°C)
Off-State Leakage
VIN
R3
VOUT
R1
0.1%
VREF
R2
0.1%
SPX431A,B,C
Shunt Regulator Vout = (1+R1/R2)Vref
VIN
R2
ISINK
Q1
SPX431A,B,C
R1
0.1%
Constant Current, Sink, Isink = Vref/R1
VOUT
R3
Opto Isolator
Isolated
Feedback
R1
0.1%
R3 sets feedback gain,
C1 provides feedback
compensation
+
C2
C1
SPX431A,B,C
VOUTRTN
R2
0.1%
Reference Amplifier for Isolated Feedback in Off-Line
DC-DC Converters
Rev F: Nov 21-06
SPX431A,B,C Precision Adjustable Shunt Regulator
© 2006 Sipex Corporation