Overload Protection
ISOLATION CHARACTERISTICS
Under normal operating conditions, the output
circuit of these products has no protection against
Item
Test Conditions
Min
Typ
Max
Units
VDC
MΩ
Isolation voltage
Tested for 1 minute and 1mA max
1000
1000
overload. The simplest method is to connect
a
Isolation resistance Test at 500VDC
self-recovery fuse in series at the input end or add a
circuit breaker to the circuit.
TYPICAL CHARACTERISTICS
Recommended testing and application 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).
Dual Output
L
L
+Vo
Vin
Cout
Cin
0V
DC
DC
DC
DC
Cout
Cout
L
L
GND
Operating Temp.(oC)
-Vo
Single Output
Vin
L
RECOMMENDED REFLOW SOLDERING PROFILE
+Vo
0V
Peak.Temp 260 C
10 Sec Max
Cin
250
GND
220 C
200
150
100
(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 recommended capacitance
of its filter capacitor sees (Table 1).
90 Sec Max
( >220
)
C
50
0
Time (sec.)
OUTLINE DIMENSIONS & PIN CONNECTIONS
First Angle Projection
A
EXTERNAL CAPACITOR TABLE (TABLE 1)
Vin
Cin
Single Cout
Dual
Vout
(VDC)
Cout
(uF)
1.27
(0.050)
2.54
(0.100)
(VDC) (uF)
Vout
(uF)
(VDC)
RECOMMENDED FOOTPRINT
Top view,grid:2.54*2.54mm(0.1*0.1inch)
5
12
-
4.7
2.2
-
5
9
10
4.7
2.2
1
±5
±9
4.7
2.2
1
14
10
5
9
6
1312
8
7
Dual output & Single Output
12
15
±12
±15
-
-
0.47
12 10 9
8
7
14 13
1
2 3
2.00
(0.079)
It’s not recommended to connect any external capacitor in
the application field with less than 0.5 watt output.
17.78(0.700)
A
2
1
3
5
6
Output Voltage Regulation and Over-voltage
Protection Circuit
1.00
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 (Figure
(0.039)
FOOTPRINT DETAILS
Singles
Pin
Duals
GND
Vin
。
5.0 MAX
1
GND
Vin
NC
0V
2
1.30 0.13
(0.052 0.005)
5
-Vo
2).
Dual Output
6
7
0V
Note:
Unit:mm(inch)
+Vo
NC
+Vo
-Vo
+Vout
REG
Vin
REG
10
Pin section:0.60*0.25mm(0.024*0.010inch)
Pin tolerances: 0.10mm( 0.004inch)
General tolerances: 0.25mm( 0.010inch)
0V
DC DC
Others
NC
NC
GND
NC:No Connection
-Vout
REG
REG
Single Output
APPLICATION NOTE
+Vout
0V
Vin
REG
Requirement on output load
DC
DC
(Figure 2)
No parallel connection or plug and play.
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, or use our company’s
products with a lower rated output power (A_T -1W/B_T-1W series).
GND
MORNSUN reserves the copyright
Specifications subject to change without notice.
A_LT-2W & B_LT-2W A/1-2008
Page 2 of 2
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