rev.
page 3 of 3
date 02/2008
PART NUMBER: VBSD1-DIP series
DESCRIPTION: dc-dc converter
- 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).
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.
FIGURE 2
RE G
+Vout
0V
+Vi n
-Vin
REG
DC
DC
- Overload protection
No parallel connection or plug and play.
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).
FIGURE 1
L
L
+Vout
+Vin
Cout
Cin
DC
DC
-Vin
-Vout
It should also be noted that the inductance and the frequency
of the “LC” filtering network should be staggered with the
dc-dc frequency to avoid mutual interference. However, the
capacitance of the output filter capacitor must be proper. If the
capacitance is too big, a startup problem might arise. For
every channel of output, provided that safe and reliable
operation is ensured, the recommended capacitance of its
filter capacitor see (Table 1).
TABLE 1
Single
Cin
(uF)
Vin
(VDC)
Cout
(uF)
Vout
(VDC)
5
4.7
2.2
2.2
1
5
9
12
15
10
4.7
2.2
1
12
15
24
It is not recommended to connect any external capacitor in the
application field with less than a 0.5 watt output.
th
20050 SW 112 Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382
CUI [ CUI INC ]
