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date 03/31/2014 │ page 4 of 5CUI Inc │ SERIES: VSK-S3 │ DESCRIPTION: AC-DC POWER SUPPLY
+V0
-V0
L
N
N
C1
C2
Tvs
RL
MOV
C3
22
26
+
+
Figure1
L
+V 0
-V0
L
N
N
C1 C2
Tvs
MOV
NF
C8
C6
C7
C3
+
+
22
26
VSK-S3 EMC
TYPICAL APPLICATION CIRCUIT
EXTERNAL CAPACITORS TYPICAL VALUE (Unit: µF)
MODEL C1 C2 C3 TVS
VSK-S3-3R3U 150 0.1 4.7/400V P4KE6.8A
VSK-S3-5U 150 0.1 4.7/400V P4KE6.8A
VSK-S3-9U 150 0.1 4.7/400V P4KE12A
VSK-S3-12U 150 0.1 4.7/400V P4KE20A
VSK-S3-15U 150 0.1 4.7/400V P4KE20A
VSK-S3-24U 150 0.1 4.7/400V P4KE30A
Notes: 1. Output ltering capacitors C1, C3 is electrolytic capacitors, It is recommended to use high frequency
and low impedance electrolytic capacitors. For capacitance and current of capacitor please refer to
manufacture’s datasheet. Voltage derating of apacitor should be 80% or above. C2, C4 is ceramic
capacitors , it is used to lter high frequency noise. TVS is a recommended component to protect
post-circuits (when converter fails).
2. MOV is required for VSK-S3 models. Model: 471KD05, it is used to protect the device under surge.
3. It is recommended to connect FUSE, the parameter is 0.5A/250V slow blow. External input NTC is
recommended to use D -14 or 10Ω/2W wire-round resistor.
4. If EMC performance is required, recommended to add “EMC lter” at the input end(see gure 2)
C6:X capacitor, recommended parameter 0.1uF/275V; C7,C8:Y capacitor, recommended parameter
220pF/275V; NF: common model choke, recommended inductance is about 10mH-30mH.
5. Terminals 22 and 26 are internal rectication and ltering terminals. To protect the models further, it
is recommended to connect an electrolytic capacitor C3 (it is recommended to be 4.7uF/400V). If
operation voltage of the module is between 160~264VAC, C3 can be removed.
Note: 1. All specications measured at Ta=25°C, humidity <75%, rated input voltage, and rated output load, unless otherwise specied.
For more information, please visit the product page.