COMMON SPECIFICATION
Item
Storage humidity
Operating temperature
Storage temperature
Temp. rise at full load
Lead temperature
Cooling
Package material
Short circuit protection*
MTBF
Weight
*Supply voltage must be discontinued at the end of short circuit duration.
APPLICATION NOTE
Min
-40
-55
15
Typ
Max
95
85
125
25
260
Free air convection
Epoxy Resin(UL94V-0)
1
3500
1.41
s
K Hours
g
°C
Units
%
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
L
Test Conditions
1.5mm from case for 10 seconds
TYPICAL CHARACTERISTICS
Vin
Cin
+Vo
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
Operating Temp.( C)
o
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
(VDC)
3.3/5
12
24
-
Cin
(uF)
4.7
2.2
0.47
-
-
Vout
(VDC)
3.3/5
9
12
15
24
Cout
(uF)
10
4.7
2.2
1
0.47
RECOMMENDED REFLOW SOLDERING PROFILE
2 50
Te m p e ra tu r e (
o
C)
2 00
1 50
1 00
50
0
Time ( s ec .)
90 Se c Ma x
( >22 0
o
C )
26 0 C
10 Sec Max
o
22 0
o
C
-
It’s not recommend to connect any external capacitor in the
application field with less than 0.5 watt output.
OUTLINE DIMENSIONS & FOOTPRINT DETAILS
4.13
(0.163)
First Angle Projection
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).
6.25
(0.246)
6.00
(0.236)
(Side view)
2.54
0.25
(0.100) (0.100)
RECOMMENDED FOOTPRINT
Top
view,grid:2.54*2.54mm(0.1*0.1inch)
B_T-1W
8 7 6 5
B_(X)T-1W
8
1 2
5
4
12.70 (0.500)
7.62
(0.300)
11.2 MAX
(0.441)
7.50
(0.295)
Vin
GND
REG
+Vout
2.00
(0.079)
1 2 3 4
DC DC
0V
REG
(Top view)
(0.039)
Vin
GND
+Vout
DC DC
0V
2.54
±
0.1
(0.100
±
0.004)
6.76
(0.266)
0.60
±
0.05
(0.024
±
0.002)
FOOTPRINT DETAILS
Pin Function(T) Function(XT)
GND
1
GND
2
Vin
Vin
0V
4
0V
5
+Vo
+Vo
No Pin
3,6,7
NC
NC
NC
8
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)
（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
A
1.85MAX
(0.073)
7.19
(0.283)
0.30
(0.012)
0.50 (0.020)
at the input end or add a circuit breaker to the
circuit.
No parallel connection or plug and play.
B_(X)T-1W
A/2-2008
Page 2 of 2
1.35MAX
(0.053)
5.00
。
MORNSUN reserves the copyright
Specifications subject to change without notice.
MORNSUN [ MORNSUN SCIENCE& TECHNOLOGY LTD. ]
