VIBLSD1-DIP Series DC-DC Converter

Rev. 12-2005

3/ 3

V-Infinity, LLC, 20050 SW 112th Ave., Tualatin, OR 97062

www.v-infinity.com

1-866-372-1258

Application Notes:

- 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.

Input Voltage

External Input Capacitance

4.7 µF

5 V

12 V

2.2 µF

24 V

1.0 µF

Table 1

- Output filtering

An output capacitor as shown in Table 2 may be used

to reduce output ripples and noise.

requirements as shown in Table 2.

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.

Vout

External Ouput Capacitance

10 µF

5 V

9 V

4.7 µF

12 V

2.2 µF

15 V

1 µF

Table 2

<Figure 1>

DC

C

L

L

DC

C

-Vin

+Vin

-Vout

+Vout

- Minimum loading

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.

- 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.

- Unregulated input

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.

REG

DC DC

-Vin

+Vin

-Vout

+Vout

<Figure 2>