- 5 -
TDK-Lambda
CN-A110 Series
Instruction Manual
4.
Take note of the maximum allowable ripple current of
the electrolytic capacitor used.
Especially, for sudden load current changes, verify
actual ripple current and make sure that maximum
allowable ripple current is not exceeded.
C2 : 2.2
μ
F
To reduce spike noise voltage at the output, connect 2.2μF
ceramic capacitor bV and –V at 50mm distance from
the output terminals.
Also, take note that output spike noise voltage could vary
according to PCB wiring design.
C3
：
For stable operation, connect a electrolytic capacitor
between +V and –V at 50mm distance from the output
terminals.
Take note that output ripple could be affected by electrolytic
capacitor,
equivalent
impedance
and
inductance characteristics
of wiring.
For cases of abrupt changes in load current or input voltage,
increasing capacitance value of the external capacitors could
reduce the voltage fluctuation.
CN30,50,100A
CN200A
5V
10V , 1000μF 10V , 2200μF
12V
25V , 470μF
25V , 1000μF
15V
25V , 470μF
25V , 1000μF
24V
50V , 220μF
50V , 470μF
Table1-1 C3 Recommended Values of External
Output Capacitor
Maximum capacitance (electrolytic capacitor) that can be
connected bV and –V, is shown below.
Maximum capacitance of output capacitor
ALL MODELS : 10,000
μ
F
Notes
1.
Use low impedance electrolytic capacitor with excellent
temperature characteristics.
(Nippon Chemi-con LXZ, 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.
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.
Reverse Input Connection
Reverse input polarity would cause module damage. For cases
where reverse connections are possible, connect a protective diode
and fuse. Use protective diode with higher voltage rating than the
input voltage, and with higher surge current rating than the fuse.
Fig.1-3 Protection for Reversed Connection of Input
2. Output Voltage Adjustment Range
(TRM terminal)
Output voltage could be adjusted within the range described
below by external resister and variable resistor or applying
external voltage.
However, take note that OVP or LVP(5V Model only) might
trigger when output voltage adjustment exceeds the ranges
indicated below.
Output Voltage Adjustment Range
5V :
–10% - +20% of Nominal Output Voltage
12V,15V,24V:
–
10% - +10% of Nominal Output Voltage
When increasing the output voltage, reduce the output current
accordingly so as not to exceed the maximum output power.
Take note that the output current when output voltage is
decreased is maximum output current of specification.
Remote sensing is possible even when output voltage is
varied. For details on remote sensing function, please refer to
“10.Remote Sensing”.
C
1
Fuse
+
Vin
-
Vin
Protective
Diode