page

date

DESCRIPTION: dc-dc converter

3 of 3

05/2008

20050

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phone 503.612.2300 fax

fax 503.612.2382

PART NUMBER: VWRBT2 Series

Application Notes:

- All of the VWRBT2-SMT Series have been tested

according to the following recommended testing

circuit before leaving the factory. This series should

be tested under load (Figure 1). If you want to

further decrease the input/output ripple, you can

increase capacitance properly or choose capacitors

with low ESR. However, the capacitance should not

be too high(Table 1).

- NC Terminals

Unless otherwise specified, NC terminals of all series

are used for converter's interior circuit

connection, and are not allowed connection of any

external circuit.

- Input current

Nominal input voltage range. The input

current of the power supply must be sufficient

to the startup current (Ip) of the DC/DC module

(Figure 2)

Temperature Derating Curve

- Output Load

In order to ensure the product operates

efficiently and reliably, make sure the specified range

of input voltage is not exceeded.

No parallel connection or plug and play.

2200

1000

330

150

120

3.3

5

9

12

15

Table 1

Figure 2

DC

DC

Cin

+Vin

-Vin

+Vout

-Vout

Figure 1

- Recommended circuit

It is best to test with full load and not to test without load. To

further reduce output ripple, you may increase the external

capacitor, choose a capacitor with low ESR, or add external

inductor to the circuit as shown above.

General:

Cin: 12V 100μF

24V 10μF or 22μF

Cout:100μF(typ)