WRA_LT-3W & WRB_LT-3W Series
3W, WIDE INPUT, ISOLATED & REGULATED
SINGLE/DUAL OUTPUT DC/DC CONVERTER
multi-country patent protection
RoHS
FEATURES
Wide (2:1) input range
Operating temperature: -40°C ~ +85°C
1500VDC isolation
No heat sink required
Internal SMD construction
MTBF>1,000,000 hours
Short circuit protection(Automatic recovery)
Industry standard pinout
RoHS Compliance
PRODUCT PROGRAM
Input
Part
Number
WRA1205LT-3W *
WRA1212LT-3W *
WRA1215LT-3W *
WRB1203LT-3W *
WRB1205LT-3W *
WRB1212LT-3W *
WRB1215LT-3W *
WRA2405LT-3W
12
9-18
22
Voltage (VDC)
Nominal Range
Max.**
Voltage
(VDC)
±5
±12
±15
3.3
5
12
15
±5
±12
±15
24
18-36
40
3.3
5
12
15
±5
±12
±15
48
36-72
80
3.3
5
12
15
Output
Current (mA)
Max.
±300
±125
±100
833
600
250
200
±300
±125
±100
833
600
250
200
±300
±125
±100
833
600
250
200
Min.
±30
±13
±10
83
60
25
20
±30
±13
±10
83
60
25
20
±30
±13
±10
83
60
25
20
76
80
80
72
74
78
80
76
80
80
74
76
80
80
76
80
80
74
76
80
80
Efficiency
(%, Typ.)
APPLICATIONS
The WRA_LT-3W & WRB_LT-3W Series are
specially designed for applications where a wide
range input voltage 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
wide range(voltage range≤2:1);
2) Where isolation is necessary between input
and output (Isolation Voltage
≤1500VDC);
3) Where the regulation of the output voltage
and the output ripple noise are dem anded.
WRA2412LT-3W *
WRA2415LT-3W *
WRB2403LT-3W *
WRB2405LT-3W *
WRB2412LT-3W *
WRB2415LT-3W *
WRA4805LT-3W *
WRA4812LT-3W *
WRA4815LT-3W *
WRB4803LT-3W *
WRB4805LT-3W *
WRB4812LT-3W *
WRB4815LT-3W *
*
Designing.
**Input voltage can’t exceed this value, or will cause the permanent damage.
MODEL SELECTION
WRB2412LT-3W
Rated Power
Package Style
Output Voltage
Input Voltage
Product Series
COMMON SPECIFICATIONS
Item
Storage humidity range
Operating temperature
Storage temperature
Temp. rise at full load
Lead temperature
Short circuit protection
Cooling
1.5mm from case for 10 seconds
-40
-55
15
245
Continous, autom atic recovery
Free air convection
Epoxy Resin (UL94-V0)
1000
5.2
K hours
g
Test conditions
Min.
Typ.
Max.
95
85
125
°C
Units
%
MORNSUN Science & Technology co.,Ltd.
Address: 2th floor 6th building, Huangzhou Industrial
District, Guangzhou, China
Tel: 86-20-38601850
Fax: 86-20-38601272
Http://www.mornsun-power.com
Package material
MTBF
Weight
The copyright and authority for the interpretation of the products are reserved by Mornsun
Specifications subject to change without notice.
WRA_LT_3W & WRB_LT_3W
A/2-2009
Page 1 of 3
ISOLATION SPECIFICATIONS
Item
Isolation voltage
Isolation resistance
Isolation Capacitance
Test conditions
Test at 500VDC
Input/Output
Min.
1000
85
Typ.
Max.
Units
VDC
MΩ
pF
Tested for 1 minute and 1mA max. 1500
TYPICAL TEMPERATURE CUTVE
OUTPUT SPECIFICATIONS
Item
Output power
Positive voltage accuracy
Load regulation
Line regulation
Temperature Drift (Vout)
Output ripple& noise**
Switching frequency
Test conditions
See above products program
Refer to recommended circuit
From 10% to 100% load
Input voltage from low to high
Refer to recommended circuit
20MHz Bandwidth
100% load, nominal input voltage
35
300
Min.
0.3
±1
±3
±0.5
±0.2
Typ.
Max.
3
±3
±5
±1*
±0.5
±0.03
75
%/°C
200
Units
W
Operating Temp.(
C
)
100
Negative voltage accuracy Refer to recommended circuit
%
250
Recommended Reflow P rofile
50 S ec M ax
(>220
℃
)
Peak.Tem p 235~ 245℃
220℃
190℃
90 Sec M ax
(>190
℃
)
KHz
Tem peratur e (
℃
)
mVp-p
150
*Dual output models unbalanced load:
±5%.
**Test ripple and noise by
“parallel
cable” method. See detailed operation instructions at Testing of Power
Converter section, application notes.
100
50
0
Time ( sec.)
APPLICATION NOTE
Requirement On Output Load
In order to ensure the product operate efficiently and reliably, in addition to a max load
(namely full load), a minimum load is specified for this kind of DC/DC converter. Make sure the
specified range of input voltage is not exceeded, the minimum output load
no less than 10%
load.
If the actual load is less than the specified minimum load, the output ripple may increase
sharply while its efficiency and reliability will reduce greatly. If the actual output power is very
small, please add an appropriate resistor as extra loading, or contact our company for other
lower output power products.
RECOMMENDED CIRCUIT
Vin
Cin
+Vout
DC
DC
0V
-Vout
GND
Single Output
Vin
Ci n
+Vout
DC
DC
0V
GND
Recommended Circuit
All the WRA_LT-3W & WRB_LT-3W Series have been tested according to the following
recommended testing circuit before leaving factory. This series should be tested under load.
(See Figure 1).
If you want to further decrease the input/output ripple, you can increase capacitance
properly or choose capacitors with low ESR. 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).
General: Cin: 12V
100μF
24V&48V
10μF~47μF
Cout: 10μF/100mA
(
Figure 1
)
Input Current(A)
Ip
Input Voltage
Range
Input Voltage (V)
(
Figure 2
)
Input Current
When it is used in unregulated power supply, be sure that the fluctuating range of the power
supply and the rippled voltage do not exceed the module standard. Input current of power
supply should afford the flash startup current of this kind of DC/DC module. (Figure 2)
General: Ip
≤1.4*Iin-max:
Output External Capacitor Table(Table 1)
Single Vout
Cout
Dual Vout
Cout
(uF)
(VDC)
(uF)
(VDC)
3.3
2200
±5
680
5
1000
±9
470
9
680
±12
330
12
470
±15
220
15
330
-
-
No parallel connection or plug and play
The copyright and authority for the interpretation of the products are reserved by Mornsun
Specifications subject to change without notice.
WRA_LT_3W & WRB_LT_3W
A/2-2009
Page 2 of 3
OUTLINE AND SOLDER PAD DIMENSIONS
MECHANICAL DIMENSIONS
7.50[0.295]
8.00[0.315]
RECOMMENDED FOOTPRINT
DUAL/SINGLE OUTPUT
2.54[0.100]
1.00[0.039]
8 .80[ 0.3 46]
(Side View)
1.02[0.040]
0.50[0.020]
1 7.22[0.678]
16
10 9
3.04[0.120]
16
15.24[0.600]
10 9
(Top View)
1
7 8
2.54[0.100]
1
13 .70[0.539]
18.60[0 .732]
7 8
2.54[0.100]
0.25[0.010]
5
°
TUBE DUTLINE DIMENSIONS
20.70[0.815]
13.80[0.543]
14.40[0.567]
1.40[0.055]
FOOTPRINT DETAILS
Pin
Single
Dual
GND
GND
1
NC
NC
7
8
NC
0V
+Vo
9
+Vo
10
0V
-Vo
16
Vin
Vin
NC: No connection
0.60[0.024]
11.30[0.445]
Note:
Unit:m m[inch]
Pin section tolerances:
±
0.10mm[
±
0.004inch]
General tolerances:
±
0.25mm [
±
0.010inch]
10.00[0.394]
Note:
Unit :mm[inch]
General tolerances:
±0.50mm[±0.020inch]
L=530mm[20.866inch] Tube Quantity: 21pcs
L=220mm[8.661inch] Tube Quantity: 8pcs
Note:
1. The load shouldn't be less than 10%, otherwise ripple will increase dramatically.
2. Operation under 10% load will not dam age the converter; However, they may not meet all specification listed.
3. All specifications measured at Ta=25°C, humidity<75%, nominal input voltage and rated output load unless otherwise specified.
4. In this datasheet, all the test methods of indications are based on corporate standards.
5. Only typical models listed, other models may be different, please contact our technical person for more details.
The copyright and authority for the interpretation of the products are reserved by Mornsun
Specifications subject to change without notice.
WRA_LT_3W & WRB_LT_3W
A/2-2009
Page 3 of 3
2 .10[0 .083]
23.86[0.939]
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