TYPICAL CHARACTERISTICS
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 be proper. If the
capacitance is too big, a startup problem
might arise. For every channel of output,
provided the safe and reliable operation is
ensured, the greatest capacitance of its
filter capacitor sees the external capacitor
table. To get an extremely 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
(Figure 1).
Ambient Temperature
)
C
(
RECOMMENDED REFLOW SOLDERING PROFILE
Peak.Temp 260℃
10 Sec Max
250
220℃
200
150
90 Sec Max
(>220℃)
100
L
L
+Vo
Vin
GND
C
C
DC DC
50
0
0V
（Figure 1）
Time (sec.)
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
(Figure2).
PIN CONNECTIONS
Pin
3
5
6
8
9
10
13
1
2
7
12
14
Function
+ Vo
NC NC 0V
Vin
GND
NC NC NC NC NC NC
OUTLINE DIMENSIONS& RECONMENDED FOOTPRINT DETAILS
+Vout
Vin
REG
DC DC
GND
0V
A
+Vout
REG
Vin
0.25
1.27
(0.05)
2.54±0.1
DC
(0.01)
DC
(0.1
±0.004)
GND
0V
(Figure2)
Overload Protection
141312 10 9 8
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.
。
5.00 MAX
1.30±0.13
1 2 3
15.24
17.78
5 6 7
(0.6)
(0.05
±0.005)
(0.7)
Note: All Pins on a 2.54mm(0.1) pitch; All Pin Widths are 0.60 mm(0.02);
Tolerances:±0.15mm(0.006); Unit: mm(inch).
EXTERNAL CAPACITOR TABLE
APPLICATION NOTE
Requirement on output load
External
capacitor
External
capacitor
Vin
Vout
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 (B_T-1W series).
5VDC
4.7uF
2.2uF
--
5VDC
9VDC
4.7uF
2.2uF
1uF
12VDC
--
--
12VDC
15VDC
--
0.47uF
It’s not recommend to connect any
external capacitor in the application
field with less than 0.5 watt output。
MORNSUN reserves the copyright For any design change and upgrade, we will not make any prior notification
A/1-2007
Page 2 of 2
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