INSTRUCTION MANUAL
CHVM3 Series
TDKLambda
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■ Vref pin (standard voltage output)
When controlling the output voltage with an adjustable resistor, this pin is used. Vref has a standard output
voltage of 4V. In this case, the external adjustable resistor is 5KΩ. Since the resistance value from the external
adjustable resistor will decide the output voltage with the effect of the specified value, use a resistance value
with an accuracy of 5KΩ±5%. The type of resistor does not matter, as long as it is 5KΩ, however one with
a good temp coefficient is recommended.
■ Temperature derating
When using the product where the ambient temp is higher than 50°C, follow the derating graph below,
increasing the load resistance as the temp increases. The minimum load resistance value is specified for each
series.
■ Preventing reverse connections
The converter may break if the polarities are reversed. If there is a possibility in which the connections maybe
reversed, connect a diode and fuse like below.
■ Recommended solder conditions
Soldering conditions for each part are as follows:
(1) Soldering iron
340 360°C
5 seconds
(2) Dip solder bath
230 260°C
10 seconds
9/10
Vout (Com)
Vcont
Vref
3
4
Standard voltage
generation circuit
External adjustable resistor
(5.0K
Ω
)
5
CHVM
series
-20 -10 0 +10 +20 +30 +40 +50 +60
100
80
60
40
20
0
Ambient temp (
℃
)
Though the system may start , reliability is not guranteed.
O
ut
pu
t d
er
at
in
g
(%)
12V
+
F1
+
Vin
-
Vin
CHVM
D1
