TDK-Lambda CPF100F280 Series Instruction Manual page 7

Table 5-1 C7: Recommended Values of External Output Capacitor
Note) 1. Use low impedance electrolytic capacitor with excellent temperature characteristics.
(Nippon Chemicon LXY Series or equivalent)
2. Use capacitors indicated in table 5-2 in parallel when ambient temperature becomes lower than –
20℃ because output ripple voltage could be affected by ESR.
Table 5-2 C7: Recommended Values of External Output Capacitor (Ta < -20℃)
3. Take note of the allowable ripple current of the capacitor to be used. Especially, when load adding
capacitors for abrupt current changes, be sure to verify that ripple current does not exceed
allowable ripple current before use.
C8：
When switches or connectors are used between input source and CPF1000F280-* Series input terminals,
impulse surge voltage is generated at input due to input throw-in by switch on/off or due to inserting/
removing of power module from the active line. For this case, connect an additional electrolytic capacitor
C8 as shown in fig.5-2 and fig. 5-3.
Recommended Capacitance Value : 10～47μF and above (Voltage Rating 450VDC)
Also, in-rush current flows at line throw-in. Therefore, be sure to verify capability of switch or fuse to
withstand I2t at line throw-in.
All specifications are subject to change without notice.
Vout
14V 25V 1,500μF x 2 parallel
Vout
14V 25V 1,500μF x 4 parallel
S w itc h
F u s e
+
C 8
Fig.5-2 Input Filter with Input Switch
S w itc h
F u s e
+
C 8
F u s e
Fig.5-3 Input Filter when Plural Power
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TDK-Lambda
CPF1000F 280-* Series
INSTRUCTION MANUAL
C7
C7
+ V in
+
C 1
- V in
+ V in
+
C 1
-V in
+ V in
+
C 1
-V in