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VIBLSD1-SIP Series DC-DC Converter
Rev. 12-2005
- Minimum loading
Application Notes:
The converter needs a minimum of 10% loading to
maintain output regulation. Operation under no-load
conditions will not cause immediate damages but
may reduce reliability, and cause performance not to
meet specifications.
- Input filtering
To reduce the reflected ripple current and minimize
EMI, especially when the converter input is more
than 2” away from the DC source, it is recommended
to connect a low ESR electrolytic capacitor between
Vin and Gnd. The values suggested are as shown in
Table 1. If additional filtering is required, the
capacitance may be increased, or expanded to an LC
network as shown in Figure 1.
- Protection
The converter has minimal protection against input
over-voltage or output over-load, and may be
permanently damaged if exposed to these conditions.
An input clamping device can be used for input
voltage limiting. An input fuse or an output fuse
can also be used to protect against over-loading.
Table 1
Input Voltage
5 V
External Input Capacitance
- Unregulated input
4.7 µF
2.2 µF
As fixed input converters, this series can accept
voltages within a limited range of the nominal input.
Otherwise the converter may not function properly or
may be damaged. An optional regulator can be used
at the input to bring voltage within regulation, as
shown in Figure 2.
12 V
24 V
1.0 µF
- Output filtering
An output capacitor as shown in Table 2 may be used
to reduce output ripples and noise.
+Vout
requirements as shown in Table 2.
+Vin
-Vin
REG
Output capacitance may be increased for additional
filtering, but should not exeed 10µF. It can also be
expanded to an LC network as in Figure 1.
DC DC
-Vout
<Figure 2>
Table 2
External Ouput Capacitance
Vout
5 V
10 µF
4.7 µF
2.2 µF
1 µF
9 V
12 V
15 V
L
L
+Vout
+Vin
-Vin
C
C
DC DC
-Vout
<Figure 1>
V-Infinity, LLC, 20050 SW 112th Ave., Tualatin, OR 97062
www.v-infinity.com
1-866-372-1258
CUI [ CUI INC ]
