TYPICAL CHARACTERISTICS
Temperature Derating Graph
Vin
GND
C
L
L
DC DC
<Figure 1>
C
L
C
+Vo
0V
-Vo
Overload Protection
Under normal operating conditions, the
output circuit of these products has no
protection against over-current and
short-circuits. The simplest method is to
connect a self-recovery fuse in series at
the input end or add a circuit breaker to
the circuit.
Vin
GND
-Vo
0V
+V0
Operating Temp.(
C
)
PIN CONNECTIONS
Bottom View
1 2 3
1011
Pin
1,24
12,13
2,23
24 23 22
1514
10,15,3,22
11,14
OUTLINE DIMENSIONS& RECONMENDED FOOTPRINT DETAILS
31.80
0.50
20.30
24 23 22
1514
9.45
1 2 3
10 11 12
15.24
2.00
27.94
2 x 2.54
4.00
External Capacitor Table
V
in
5VDC
External
capacitor
4.7uF
2.2uF
1uF
--
V
out
5VDC
9VDC
12VDC
15VDC
External
capacitor
4.7uF
2.2uF
1uF
0.47uF
(Bottom View)
(Side View)
12VDC
24VDC
--
Note: All Pins on a 2.54mm pitch; all pin diameters are 0.50mm; all dimensions in mm.
APPLICATION NOTE
Filtering
In some circuits which are sensitive to noise and ripple, a filtering capacitor
may be added to the DC/DC output end and input end to reduce the noise and
ripple. However, the capacitance of the output filter capacitor must proper. If
the capacitance is too big, a startup problem might arise. For every channel of
output, providing the safe and reliable operation is ensured, the greatest
capacitance of its filter capacitor refer to the external capacitor table. To get an
extreme low ripple, an “LC” filtering network may be connected to the input and
output ends of the DC/DC converter, which may produce a more significant
filtering effect. 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 (see figure 1).
Requirement on output load
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 (IA_P -1W series).
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Edition: A
NOV-2005
Page 2 of 2
MORNSUN [ MORNSUN SCIENCE& TECHNOLOGY LTD. ]
