B0303 Datasheet, PDF (2/2 Pages) MORNSUN Science& Technology Ltd. – SINGLE OUTPUT, SMD DC-DC CONVERTER

COMMON SPECIFICATION
Item
Test Conditions
Min
Typ Max Units
Storage humidity
95
%
Operating temperature
-40
85
Storage temperature
Temp. rise at full load
-55
125
°C
15
25
Lead temperature
1.5mm from case for 10 seconds
260
Cooling
Free air convection
Package material
Epoxy Resin(UL94V-0)
Short circuit protection*
1
s
MTBF
3500
K Hours
Weight
1.41
g
*Supply voltage must be discontinued at the end of short circuit duration.
TYPICAL CHARACTERISTICS
Operating Temp.(^oC)
RECOMMENDED REFLOW SOLDERING PROFILE
2 50
26 0^oC
10 Sec Max
22 0^oC
2 00
1 50
90 Sec Max
1 00
( >22 0 ^oC )
50
0
Time (sec.)
OUTLINE DIMENSIONS & FOOTPRINT DETAILS
First Angle Projection
(Side view)
2.54 0.25
(0.100) (0.100)
12.70 (0.500)
7.62
(0.300)
RECOMMENDED FOOTPRINT
Top view,grid:2.54*2.54mm(0.1*0.1inch)
B_T-1W
B _ ( X ) T- 1 W
2.00
( 0 . 0 7 9)
8765
1234
8
5
12 4
APPLICATION NOTE
Requirement on output load
To ensure this module can operate efficiently and
reliably, During operation, 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.
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 (Figure 1).
Single Output
L
Vin
L
+Vo
Cin
DC DC
Cout
GND
0V
(Figure 1)
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 the safe
and reliable operation is ensured, the greatest
capacitance of its filter capacitor sees (Table 1).
EXTERNAL CAPACITOR TABLE (Table 1)
Vin
Cin
Vout
Cout
(VDC)
(uF)
(VDC)
(uF)
3.3/5
4.7
3.3/5
10
12
2.2
9
4.7
24
0.47
12
2.2
-
-
15
1
-
-
24
0.47
It’s not recommend to connect any external capacitor in the
application field with less than 0.5 watt output.
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).
Vin
GND
REG
DC DC
+Vout
0V
(Top view)
2.54±0.1
(0 .10 0±0 . 0 0 4 )
0 .60±0 .0 5
(0 . 0 2 4±0 . 00 2 )
6 .76
(0 . 2 6 6)
1 . 85 M A X
( 0 . 0 7 3)
7 . 19
(0 .28 3)
A
0 . 30
(0.012)
1 . 35 M A X
( 0 . 0 5 3)
0.50 (0.020)
5.00 ^。
( 0 . 0 3 9)
FOOTPRINT DETAILS
Pin Function(T) Function(XT)
1
GND
2
Vin
GND
Vi n
4
0V
0V
5
+Vo
+Vo
3,6,7
NC
No Pin
8
NC
NC
NC:No Connection
Note:
Unit:mm(inch)
Pin section:0.60*0.25mm(0.024*0.010inch)
Pin tolerances:+0.10mm(+0.004inch)
General tolerances:+0.15mm(+0.006inch)
Vin
GND
REG
DC DC
（Figure2）
+Vout
0V
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.
No parallel connection or plug and play.
MORNSUN reserves the copyright
Specifications subject to change without notice.
B_(X)T-1W
A/2-2008
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