a
- 5 -
TDK-Lambda
CN-A24 Series
Instruction Manual
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.
Take note that, PCB wiring design might influence
output spike noise.
C3
：
For stable operation, connect a electrolytic capacitor
bV 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.
Model and C3 recommended values of external output
capacitor are below.
5V
25V , 1000μF
12V
25V , 470μF
24V
50V , 220μF
Table1-1 C3 Recommended Values of External
Output Capacitor
Maximum capacitance (electrolytic capacitor) that
can be connected between +V and –V, is described
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 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 current rating.
Fig.1-3 Protection for Reversed Connection of Input
2. Output Voltage Adjustment Range
Output voltage could be adjusted within the range
described below by external resistor, variable resistor
or applying external voltage.
However, take note that OVP or Low Voltage
Protection (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,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 when output voltage is decreased,
maximum output current is until rated 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”.
C1
Fuse
+Vin
-Vin
Protective
Diode