rev.

page

date

DESCRIPTION: dc-dc converter

3 of 3

09/2008

20050

phone

phone 503.612.2300 fax

fax 503.612.2382

PART NUMBER: VBSD1-DIP series

APPLICATION NOTES:

- Requirement on output load

To ensure this module can operate efficiently and reliably,

the minimum output load should not be less than 10% of the

full load. Also, this product should never be operated under

no load conditions. If the actual output power is too small,

please connect a resistor with proper resistance at the output

end in parallel to increase the load.

- Overload protection

Under normal operating conditions, the output circuit of these

products has no protection against overload. The simplest

method is to connect a self-recovery fuse in series at the

input end or to add a circuit breaker to the circuit.

- Recommended circuit

If you want to further decrease the input/output ripple, an “LC”

filtering network may be connected to the input and output

ends of the dc-dc converter, see (Figure 1).

To ensure this module can operate efficiently and reliably, a

minimum load is specified for this kind of dc-dc converter in

addition to a maximum load (namely full load). During

operation, make sure the specified range of input voltage is

not exceeded, the minimum output load is not less than 10%

of the full load, and that this product should never be operated

under no load. If the actual output power is very small, please

connect a resistor with proper resistance at the output end in

parallel to increase the load, or use our company’s products

with a lower rated output power.

It is not recommended to connect any external capacitor in the

application field with less than a 0.5 watt output.

External

capacitor

External

capacitor

3.3/5VDC

4.7uF

3.3VDC

10uF

12VDC

2.2uF

5VDC

10uF

24VDC

1uF

9VDC

4.7uF

---

---

12VDC

2.2uF

--

--

15VDC

1uF

EXTERNAL CAPACITOR TABLE

L

+Vin

-Vin

+Vout

-Vout

DC

Cin

L

DC

Cout

- Output voltage regulation and over-voltage protection circuit

The simplest device for output voltage regulation, over-voltage

and over-current protection is a linear voltage regulator with

overheat protection that is connected to the input or output

end in series (Figure 2).

Vin

GND

Vin

GND

REG

+Vout

0V

0V

+Vout

DC DC

DC DC

REG

FIGURE 1

FIGURE 2

(

)

TYPICAL CHARACTERISTICS