A_LT-2W & B_LT-2W Series
2W, FIXED INPUT, ISOLATED & UNREGULATED,
DUAL/SINGLE OUTPUT, SMD, DC-DC CONVERTER
FEATURES
High Efficiency up to 85%
SMD Package
1KVDC Isolation
Temperature Range: -40°C to +85°C
Internal SMD Construction
No Heat sink Required
No External Component Required
Industry Standard Pinout
RoHS Compliance
multi-country patent protection
Output
RoHS
PRODUCT PROGRAM
Input
Part
Number
A0505LT-2W
A0509LT-2W
A0512LT-2W
A0515LT-2W
B0505LT-2W
B0509LT-2W
B0512LT-2W
B0515LT-2W
A1205LT-2W
5
4.5-5.5
Voltage (VDC)
Nominal
Range
Voltage
(VDC)
±5
±9
±12
±15
5
9
12
15
±5
±9
±12
12
10.8-13.2
±15
5
9
12
15
Current (mA)
Max
±200
±111
±83
±67
400
222
167
133
±200
±111
±83
±67
400
222
167
133
Min
±20
±11
±8
±7
40
23
17
14
±20
±11
±8
±7
40
23
17
14
82
83
84
82
80
82
84
84
83
84
84
85
82
83
85
85
Efficiency
(%, Typ)
APPLICATIONS
The A_LT-2W
& B_LT-2W
Series
are
specially designed for applications where a
group of polar power supplies are isolated from
the input power supply in a distributed power
supply system on a circuit board.
These products apply to:
1) Where the voltage of the input power supply
is fixed (voltage variation
≤ ±10%);
2) Where isolation is necessary between input
and output (isolation voltage
≤1000VDC);
3) Where the regulation of the output voltage
and
the
output
ripple noise
are not
demanding.
Such as: purely digital circuits, ordinary low
frequency analog circuits, and IGBT power
device driving circuits.
A1209LT-2W
A1212LT-2W
A1215LT-2W
B1205LT-2W
B1209LT-2W
B1212LT-2W
B1215LT-2W
OUTPUT SPECIFICATIONS
Item
Output power
Line regulation
For Vin change of 1%
10% to 100% load (5V output)
Load regulation
10% to 100% load (9V output)
10% to 100% load (12V output)
10% to 100% load (15V output)
Output voltage accuracy
Temperature drift
Ripple & Noise*
Switching frequency
100% full load
20MHz Bandwidth
Full load, nominal input
75
70
12.8
8.3
6.8
6.3
Test Conditions
Min
0.2
Typ
Max
2
±1.2
15
15
15
15
0.03
150
%/°C
mVp-p
KHz
%
Units
W
See tolerance envelope graph
MODEL SELECTION
A0505LT-2W
Rated Power
Package Style
Output Vol tage
Input Voltage
Product Series
*Test ripple and noise by
“parallel
cable” method. See detailed operation instructions at Testing of Power
Converter
Section, application notes.
COMMON SPECIFICATION
Item
Storage humidity
Operating temperature
Storage temperature
Lead temperature
-40
-55
15
1.5mm from case for 10 seconds
Test Conditions
Min
Typ
Max
95
85
125
25
260
Free air convection
1
Plastic(UL94-V0)
3500
2.1
K hours
g
s
°C
Units
%
MORNSUN Science& Technology co.,Ltd.
Address:
2th floor 6th building, Hangzhou
Industrial District, Guangzhou, China
Tel: 86-20-38601850
Fax: 86-20-38601272
http://www.mornsun-power.com
Temp. rise at full load
Cooling
Short circuit protection*
Case material
MTBF
Weight
*Supply voltage must be discontinued at the end of short circuit duration.
Note: 1.All specifications measured at TA=25°C, humidity<75%, nominal input voltage and rated output load
unless otherwise specified.
2.See below recommended circuits for more details.
MORNSUN reserves the copyright
Specifications subject to change without notice.
A_LT-2W & B_LT-2W
A/1-2008
Page 1 of 2
ISOLATION CHARACTERISTICS
Item
Isolation voltage
Test Conditions
Tested for 1 minute and 1mA max
Min
1000
1000
Typ
Max
Units
VDC
MΩ
Overload Protection
Under norm al 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.
Isolation resistance Test at 500VDC
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 Out put
Vin
Cin
L
L
+Vo
Cout
DC DC
Operating Temp.(
o
C)
GND
Singl e Output
L
L Cout
L
0V
-Vo
+Vo
RECOMMENDED REFLOW SOLDERING PROFILE
250
Vin
Cin
Temperature ( C )
200
150
100
50
0
P eak.Temp 260 C
10 S ec Max
220 C
DC DC
(Figure 1)
Cout
GND
0V
It should also be noted that the inductance and the
90 S ec M ax
( > 220 C )
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).
A
0. 25
(0.010)
Ti me (sec.)
OUTLINE DIMENSIONS & PIN CONNECTIONS
First Angle Projection
6.00
(0.236)
5.75
(0.226)
2.75
(0.108)
EXTERNAL CAPACITOR TABLE (TABLE 1)
1.27
(0.050)
2.54
(0.100)
Vin
(VDC)
5
12
-
-
Cin
(uF)
4.7
2.2
-
-
17.78(0.700)
12.70(0.500)
14 13 12
10 9 8
RECOMMENDED FOOTPRINT
Top view,grid:2.54*2.54mm(0.1*0.1inch)
Dual output & Single Output
14 13 12
10 9 8
Single
Vout
(VDC)
5
9
12
15
Cout
(uF)
10
4.7
2.2
1
Dual
Vout
(VDC)
±5
±9
±12
±15
Cout
(uF)
4.7
2.2
1
0.47
1
2 3
5 6 7
2.00
(0.079)
It’s not recommended to connect any external capacitor in
the application field with less than 0.5 watt output.
1 2 3
5 6 7
17.78 (0.700)
A
0.5
(0.020)
1.00
(0.039)
FOOTPRINT DETAILS
Singles
Pin
Duals
1
GND
2
Vin
5
NC
6
0V
7
+Vo
10
NC
Others
NC
NC:No Connection
GND
Vin
-Vo
0V
+Vo
-Vo
NC
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 (Figure
2).
Du a l O u tp u t
Vin
GND
S in g l e O u tp u t
Vin
GND
REG
REG
+Vout
REG
REG
+Vout
0V
REG
-Vout
。
5.0 MAX
1.30 0.13
(0.052 0.005)
Note:
Unit:mm(inch)
Pin section:0.60*0.25mm(0.024*0.010inch)
Pin tolerances: 0.10mm( 0.004inch)
General tolerances: 0.25mm( 0.010inch)
DC DC
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, or use our company’s
products with a lower rated output power (A_T -1W/B_T-1W series).
DC DC
0V
(Figure 2)
No parallel connection or plug and play.
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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