COMMON SPECIFICATIONS
Item
Storage humidity
Operating temperature
Storage temperature
Temp. rise at full load
Lead temperature
Short circuit protection*
Cooling
package material
MTBF
Weight
*Supply voltage must be discontinued at the end of short circuit duration.
APPLICATION NOTE
Min
Typ
Max
95
-40
-55
15
85
125
25
260
1
Free air convection
Plastic (UL94-V0)
3500
2.1
K hours
g
S
°C
Units
%
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
(D_T
–1W).
Recommended testing 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 (Figure1).
L
L
Test Conditions
1.5mm from case for 10 seconds
TYPICAL CHARECTERISTICS
+Vo1
C
Vin
C
DC DC
(Figure 1)
L
C
0V1
+Vo2
0V2
GND
It should also be noted that the inductance and the
frequency of the
“LC”
filtering network should be
Ambient Temperature
( C )
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 the safe and reliable operation is
ensured, the greatest capacitance of its filter capacitor
sees (Table 1).
EXTERNAL CAPACITOR TABLE (TABLE 1)
RECOMMENDED REFLOW SOLDERING PROFILE
250
Te mp eratu r e ( C)
200
150
100
50
0
Time ( sec . )
90 Sec Ma x
( >220
o
C )
26 0 C
1 0 S ec M ax
o
22 0
o
C
o
Vin
(VDC)
5
12
-
-
Cin
(uF)
4.7
2.2
-
-
Vout
(VDC)
5
9
12
15
Cout
(uF)
4.7
2.2
1
0.74
OUTLINE DIMENSIONS& RECOMMENDED FOOTPRINT
First Angle Projection
6.00
(0.236)
5.75
(0.2 2 6)
2.75
(0.10 8)
1.27
(0.05 0)
0.25
(0.01 0)
It’s not recommended to connect any external capacitor in the
application field with less than 0.5 watt output.
RECOMMENDED FOOTPRINT
Top
view,grid :2.54mm(0 .1inch)
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
14 13 12
17.78(0.700)
12.70( 0.500)
10 9 8
1413 12
10 9 8
connected to the input or output end in series (Figure2).
Vo1
Vin
REG
0V1
2.0
DC
1 2 3
5 6 7
GND
DC
REG
Vo2
0V2
1 2 3
5 6 7
15.24 (0.600)
17.78 (0.700)
1.0
Vo1
0V1
(0.039)
Vin
DC
GND
DC
REG
Vo2
0V2
A
0.25
A
1.30 0.13
(0.051 0.005 )
0.50 (0.02 0)
。
FOOTPRINT DETAILS
Function
1
2
5
6
9
10
Others
GND
Vin
0V1
Vo1
Vo2
(Figure2)
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 add a circuit breaker to the
circuit.
No parallel connection or plug and play.
5. 00
Note:
Unit:mm(inch)
Pin sectio n:0.60*0.25mm(0.024 *0.010inch)
Pin sectio n tolera nces: 0.10mm( 0.004inch)
General tolera nces: 0.1 5mm( 0.006 in ch)
0V2
NC
NC:No connection
MORNSUN reserves the copyright
Specifications subject to change without notice.
D_T-2W
A/0-2008
Page 2 of 2
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