TDK-Lambda CHVM1R5 Series, Instruction Manual

Page: 9 / 11

INSTRUCTION MANUAL
CHVM1R5 Series
TDK­Lambda
<Page>
■ Setting and adjustment of output voltage
The output voltage of the CHVM series can be set and adjusted by external voltage and external variable resistor.
●In the above characteristic graph (output voltage ­ VR resistance characteristic), the resistance R1 and R2 are for
a guideline. When setting output at a fixed voltage with a fixed resistor, do so after determining R1 and R2 using
a variable resistor.
●Do not apply 6V+3% or more voltage to Vcont.
●Use a variable resistor with a good temperature coefficient.
●It is preset that when the resistance of the variable resistor is 5.0KΩ, 6.0V is applied to the Vcont terminal to
obtain 100% output voltage. Since the tolerance of the resistance value largely affects the maximum output
voltage, set the resistance value at 5.0KΩ±5%.
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100％
80％
60％
40％
20％
0％
Output voltage – VR resistance characteristic
VR resistance
R1 5kΩ
R2 0kΩ
0kΩ
5kΩ
O
u
tp
u
t
vo
lta
g
e
(
%
)
Output voltage – output control voltage characteristic
0V
100％
80％
60％
40％
20％
0％
6V
4.5V
3V 1.5V
Output control voltage
O
u
tp
u
t v
o
lta
g
e
(
%
)
12V
SW1
Load
1
2
4
6
3
SW1
Open=OFF
Short=ON
＋
C1
5
7
＋
C1=47μF
＋Vin
－Vin
Vout (＋ or －）
Com
(Vout)
Vref
Vcont
ON/OFF
CASE
F1
12V
SW1
Load
1
2
4
6
3
SW1
Open=OFF
Short=ON
＋
C1
5
7
＋
C1=47μF
＋Vin
－Vin
Vout (＋ or －）
Vout
(Com)
Vref
Vcont
ON/OFF
CASE
F1
Output voltage control
(0V to 6V applied)
or
VR(5kΩ)
R1 R2