TDK-Lambda CHVM3 Series Instruction Manual page 10

■ To reduce output noise further
The CHVM series does need any external parts, however to lower the output noise farther, connect a capacitor C2
like the figure below.
When lowering the output noise, the wiring of the input and output should be as short as possible.
Place C2 closest to the load, paying attention to creepage and clearance distances.
Point!
(1) Choose a capacitor with a high­frequency when adding to the input.
(2) Earth (COMMON) line should be thick and short in the pattern design to lower the common impedance.
(3) The capacitor which is connected to the output side should be able to withstand the pressure, when
connected to the loadside. At this time, the capacitor lead should be shortened. Also when the load
response time is a problem, please be aware of the time constant.
■ Safety standard
The CHVM series has attained the UL60950­1, CSA60950­1 certification.
When using this product as a recognized (certified) product, an input fuse should be mounted like below.
Choose a fuse(F1) from below:
･UL Listed products
･DC250V､Rated current 2A type
CHVM
F1
1
+Vin Vout (+ or -)
+
12V
C1
-Vin
2
Vref
4
(OPEN )
Output voltage control
CHVM
F1
1
+Vin Vout (+ or -)
+
12V
C1
-Vin
2
Vref
4
(OPEN )
Output voltage control
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6
C2
Load
5
Vout (Com)
Vcont
C1=22 47 F
～ μ
3 C2=0.047 0.1 F
～ μ
+
(Apply 0V to 4V)
6
C2
Load
5
Vout (Com)
Vcont
C1=22 47 F
～ μ
3 C2=0.047 0.1
～ μ
+
(Apply 0V to 4V)
TDK­Lambda
CHVM3 Series
INSTRUCTION MANUAL
F