COMMON SPECIFICATION
Item
Storage humidity
Operating temperature
Storage temperature
Temp. rise at full load
Lead temperature
Cooling
Case material
Short circuit protection*
MTBF
Weight
*
Supply voltage must be discontinued at the end of short circuit duration.
3500
1.35
1.5mm from case for 10 seconds
-40
-55
15
Test Conditions
Min
Typ.
Max
95
85
125
25
260
Free air convection
Plastic(UL94-V0)
1
s
K hours
g
°C
Units
%
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 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).
L
TYPICAL CHARACTERISTICS
Vin
Cin
+Vo
DC DC
(Figure 1)
Cout
GND
0V
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
Operating Temp.(
o
C)
capacitance is too big, a startup problem might
arise. It’s not recommended to connect any
external capacitor in the application field.
RECOMMENDED REFLOW SOLDERING PROFILE
250
Temperature (
o
C)
200
150
100
50
0
Time ( s ec . )
90 Sec Max
(>220
o
C )
260
o
C
1 0 S ec M ax
22 0
o
C
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).
OUTLINE DIMENSIONS & FOOTPRINT DETAILS
4.13
(0.163)
Vin
GND
REG
+Vout
First Angle Projection
RECOMMENDED FOOTPRINT
Top
view,grid:2.54*2.54mm(0.1*0.1inch)
DC DC
0V
REG
6.25
(0.246)
6.00
(0.236)
(Side view)
2.54
0.25
(0.100) (0.100)
12.70 (0.500)
7.62
(0.300)
Vin
B_T-W2
B_(X)T-W2
+Vout
GND
8 7 6 5
2.00
(0.079)
DC DC
0V
8
1 2
5
4
1 2 3 4
1.00
(0.039)
(Figure2)
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.
11.20
(0.441)
7.50
(0.295)
(Top view)
2.54 0.10
(0.100 0.004)
0.60 0.05
(0.024 0.002)
6.76
(0.266)
A
1.85
(0.073)
7.19
(0.283)
0.3
(0.012)
FOOTPRINT DETAILS
Pin Function(T) Function(XT)
1
GND
GND
2
Vin
Vin
4
0V
0V
5
+Vo
+Vo
NC
No Pin
3,6,7
8
NC
NC
NC:No Connection
Note:
Unit:mm(inch)
Pin section:0.60*0.25mm(0.024*0.010inch)
Pin section tolerances: 0.10mm( 0.004inch)
General tolerances: 0.15mm( 0.006inch)
0.50 (0.020)
1.35
(0.053)
。
5.00
MORNSUN reserves the copyright
Specifications subject to change without notice.
B_(X)T-W2
A/1-2008
Page 2 of 2
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