TDK-Lambda PH-A280 Series Instruction Manual - Tdk-Lambda
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TDK-Lambda
PH-A280 Series
INSTRUCTION MANUAL
F1 : Input Fuse
This PH-A280 Series has no built-in fuse.
Use external fuse to acquire various Safety Standards and to improve safety.
Moreover, use fast-blow type for every power supply.
Furthermore, fuse must be connected to the +Vin side if –Vin side is used as ground, or fuse must be
connected to –Vin side if +Vin side is used as a ground.( However, as mentioned above, the PSU can
consider as Basic insulation only when +Vin and Earth are connected, the safety approval of PSU is not
considered, Please examine together with the system)
Input Fuse Recommended Current Rating :
PH-A280:2A or lower
Consider margin over the actual input voltage to be used when selecting fuse
.
Moreover, consider I2t fuse
rating for surge current (inrush current) during line throw-in.
C1:
To prevent the effect of input line inductance to the power supply, connect electrolytic capacitor between
+Vin and –Vin terminals.
Take note that in case of large equivalent series resistance (especially operation at low ambient temperature).
P
ower supply output might not shut down normally.
Recommended Capacitor Value:22μF or more
Moreover, consider to keep margin over the actual input voltage to be used when selecting electrolytic
capacitor.
Note) 1. Use low impedance electrolytic capacitor with excellent temperature characteristics.
(Nichicon CY Series or equivalent)
2. Use more than two recommended capacitor above in parallel when ambient temperature becomes
lower than –20 ºC to reduce ESR.
3.
When input line inductance becomes excessively high due to insertion of choke coil, operation of the
power supply could become unstable. For this case, increase C1 value more than the value indicated
above.
4. The module might be damaged by occurrence of surge which is several times the input voltage
due to input line inductance during turn on. Therefore, add electrolytic capacitor at Input
terminal and so on to absorb surge.
Moreover, if slope of input voltage is steep, add electrolytic capacitor so that dv/dt of rise up
slope become less than 20V/μs.