TDK-Lambda CHVM3 Series Instruction Manual page 8

■ Setting and adjustment of output voltage
The CHVM series output voltage can be adjusted by using an external voltage or external adjustable resistor.
●The above characteristics (Output voltage ­VR resistance value characteristic) graph is an indication
of the resistance value R1 and R2.When setting the voltage to a set rate using a stable resistor,
first decide the adjustable resistor R1 and R2.
●Do not apply voltage higher than 4V+5% on the Vcont.
●Choose an adjustable resistor appliance with good temp characteristics.
●When the resistance value for the adjustable resistor is 5.0KΩ, the max output voltage of 4.0V which is 100%,
should be applied to Vcont pin. Since the max output voltage largely affects the margin of error for the
resistance value, set the resistance value at 5.0KΩ±5%.
CHVM
F1
1
+Vin
+
12V
C1
-Vin
2
Vref
4
Output voltage－VR resistance value characteristic
100%
80%
60%
40%
20%
0%
R1 5KΩ
VR resistance value
R2 0KΩ
Output voltage－Output control voltage
characteristic
100%
80%
60%
40%
20%
0%
0V 1V
Output control voltage
<Page> 8/10
6
Vout (+ or -)
C2
Load
5
Vout (Com)
C1=47 μ F
Vcont
C2=4700 pF
3
Output voltage control
Apply 0v to 4 V
+
or
VR (5 K Ω )
R1 R2
0KΩ
5KΩ
2V 3V 4V
TDK­Lambda
CHVM3 Series
INSTRUCTION MANUAL