a
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TDK-Lambda
CN-A24 Series
Instruction Manual
■
Explanations on Specifications
1. Input Voltage Range
Input voltage range for CN100A24 Series is indicated
below.
Input Voltage Range : 14.4 - 36VDC
Ripple voltage (Vrpl) which results from rectification and
filtering of commercial AC line is might be included within
the input voltage as shown in Fig. 1-1. In this case, ripple
voltage must be limited within the voltage described
below.
Allowable Input Ripple Voltage : 2Vp-p
When this value is exceeded, the output ripple voltage
becomes large.
Take note that sudden input voltage change might be
cause variation of output voltage transitionally.
Also, input voltage waveform peak value must not
exceed above input voltage range.
Fig.1-1 Input Ripple Voltage
Basic Connection
Fig.1-2 Basic Connection
Input Fuse
This power module has no built-in fuse. Use external fuse
to acquire various Safety Standards and to improve safety.
Also, use fast-blow type or normal-blow type for every
module.
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.
Input Fuse Recommended Current Rating :
CN100A24 : 15A
CN50A24 : 8A
C1 :
To prevent the effect of input line inductance to the
power module, connect electrolytic capacitor between
+Vin and –Vin terminals.
Furthermore, use electrolytic capacitor with low ESR
value. Especially take note that during line turn off at
low ambient temperature, power module output will not
normally shut down.
Recommended Capacitor Value : 470
μ
F and above
(Voltage Rating 50V and above)
Notes
1.
Use low impedance electrolytic capacitor with
excellent temperature characteristics.
(Nippon Chemi-con LXY Series or equivalent)
2.
Use more than two recommended capacitor
above in parallel when ambient temperature
becomes lower than –20
℃
to reduce ESR.
3.
When input line inductance becomes excessively
high due to insertion of choke coil, operation of
the power module could become unstable. For
this case, increase C1 value more than the value
indicated above.
Fuse
CN-A24
+Vin
-Vin
+V
-V
+S
-S
TRM
Base-plate
CNT
C1
C3
C2
+
-
Load
Vrpl
2V
or lower
