WRB_LT-3WR2 SERIES
3W,WIDE
INPUT, ISOLATED & REGULATED
SINGLE OUTPUT DC/DC CONVERTER
FEATURES
●
Ultra-small size, SMD packag
●
2:1 wide input voltage range
●
Operating temperature range:
-40°C ~ +85°C
●
1.5KVDC isolation
●
Short circuit protection (automatic recovery)
●
High power density
●
Meet UL94-V0
Patent Protected RoHS
PART NUMBER SYSTEM
Rated Power
Package Style
Output Voltage
Input Voltage
Product Series
APPLICATION
The WRB_LT-3WR2 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.
1) These products apply to where: Input voltage range≤2:1;
2) 1.5KV input and output isolation;
3) Regulated and low ripple noise is required.
SELECTION GUIDE
Input Voltage(VDC)
Model
Nominal
(Range)
12
WRB1212LT-3WR2
(9-18)
WRB1215LT-3WR2
WRB2405LT-3WR2
24
WRB2412LT-3WR2
(18-36)
WRB2415LT-3WR2
WRB4805LT-3WR2
48
WRB4812LT-3WR2
(36-75)
WRB4815LT-3WR2
15
200
10
78
1000
80
Note:①. Absolute maximum rating without damage on the converter, but it isn't recommended.
①
Max.
Output
Voltage
(VDC
5
Output Current (mA)
Max.
600
250
200
600
250
200
600
250
Min.
30
12
10
30
12
10
30
12
Input Current (mA)(typ.)
@Max.
Load
333
325
316
164
154
156
81
78
8
12
22
@No Load
Reflected
Ripple
Current
(mA,typ.)
Max.
Capacitive
Load(µF)
3300
1800
1000
3300
Efficiency
(%, typ.)
@Max. Load
75
77
79
76
81
80
77
80
WRB1205LT-3WR2
22
12
15
5
40
12
15
5
30
1800
1000
3300
1800
80
12
INTPUT SPECIFICATIONS
Item
Test Conditions
12VDC input
Input Surge Voltage (1sec. max.)
24VDC input
48VDC input
12VDC input
Start-up Voltage
24VDC input
48VDC input
Input Filter
Min.
-0.7
-0.7
-0.7
4.5
11
24
Typ.
--
--
--
8
16
33
Pi Filter
Max.
25
50
100
VDC
9
18
36
Unit
OUTPUT SPECIFICATIONS
Item
Output Voltage Accuracy
No-load Output Voltage Accuracy
Line Regulation
Load Regulation
Test Conditions
5% to 100% load
Vo≤5V
Vo＞5V
Full load, Input voltage from low to high
5% to 100% load
Min.
--
--
--
--
--
WRB_LT-3WR2
Typ.
±1
±1.5
±1.5
±0.2
±0.2
Max.
±3
±5
±3
±0.4
±0.75
Unit
%
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MORNSUN
2013.03.12-A/1
Page 1
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Transient Recovery Time
Transient Response Deviation
Temperature coefficient
Ripple*
Noise*
Output Short Circuit Protection
25% load step change
100% load
20MHz Bandwidth
--
--
--
--
--
0.5
±2
±0.02
20
45
1
±5
±0.03
35
60
ms
%
%/°C
mVp-p
Continuous, automatic recovery
Note:* Ripple and noise tested with
“parallel
cable” method. See detailed operation instructions at
DC-DC Application Notes.
COMMON SPECIFICATIONS
Item
Isolation Voltage
Isolation Resistance
Isolation Capacitance
Switching Frequency(PFM Mode)
MTBF
Case Material
Weight
--
Test Conditions
Tested for 1 minute , leakage current less than 1 mA
Test at 500VDC
Input/Output,100KHz/0.1V
100% load, nominal input voltage
MIL-HDBK-217F@25℃
Min.
1500
1000
--
--
1000
Typ.
--
--
1
350
--
Max.
--
--
--
--
--
Unit
VDC
MΩ
nF
KHz
K hours
Epoxy Resin（UL94-V0）
5.2
--
g
ENVIRONMENTAL SPECIFICATIONS
Item
Storage Humidity
Operating Temperature
Storage Temperature
Temp. rise at full load
Lead Temperature
Cooling
Ta=25°C
1.5mm from case for 10 seconds
Test Conditions
Non condensing
Power derating (above 85℃,see Figure 5)
Min.
--
-40
-55
--
--
Typ.
--
--
--
25
--
Max.
95
85
125
--
300
°C
Unit
%
Free air convection
EMC SPECIFICATIONS
EMI
CE
RE
ESD
RS
EFT
EMS
Surge
CS
Voltage dips,short and
interruptions immunity
CISPR22/EN55022
CISPR22/EN55022
IEC/EN61000-4-2
IEC/EN61000-4-3
IEC/EN61000-4-4
IEC/EN61000-4-4
IEC/EN61000-4-5
IEC/EN61000-4-6
CLASS B（External Circuit Refer to Figure1-② or Figure 3）
CLASS B（External Circuit Refer to Figure1-② or Figure 3）
Contact
±4KV
10V/m
±2KV
±4KV
±2KV
3 Vr.m.s
perf. Criteria B
perf. Criteria A
perf. Criteria B（External Circuit Refer to Figure1-①）
perf. Criteria B（External Circuit Refer to Figure 3）
perf. Criteria B（External Circuit Refer to Figure1-① or Figure 3）
perf. Criteria A
perf. Criteria B
IEC/EN61000-4-29 0%-70%
EMC RECOMMENDED CIRCUIT
FU SE
Vi n
+
MO V
GND
TVS
C1
C0
GND
0V
C2
LD M1
LD M2
Vi n
+Vo
EUT
L O AD
①
(Figure1)
②
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MORNSUN
WRB_LT-3WR2
2013.03.12-A/1
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Recommended external circuit parameters：
Model
FUSE
MOV
LDM1
TVS
C0
LDM2
C1
C2
4.7uF/50V
4.7uF/50V
--
--
SMCJ28A
680μF/25V
SMCJ48A
120μF/50V
12μH
4.7uF/100V
4.7uF/100V
Vin:12V
Vin:24V
Choose according to practical input current
10D560
56μH
SMCJ90A
120μF/100V
10D101
Vin:48V
Note: 1. In Figure 1,part① is EMS Recommended external circuit, part② is EMI recommended external circuit. Choose according to requirements;
2. If there is no recommended parameters, the model no require the external component.
EMC RECOMMENDED CIRCUIT PCB LAYOUT
(Figure 2)
EMC MODULE APPLICATION CIRCUIT
FU S E
+V in
+V in
V in
+ Vo
+
C
-V in
-Vin
FT- A /B X1 D
+Vo
-Vo
GN D
EUT
Load
0V
Nominal Input Voltage<48V, C≥330uF/50V
Nominal Input Voltage=48V, C≥330uF/100V
FT-A/BX1D is MORNSUN’s EFT suppresser
(Figure 3)
EMC MODULE RECOMMENDED CIRCUIT PCB LAYOUT
(Figure 4)
EMI TEST WAVEFORM (NOMINAL AND FULL LOAD)
WRB2405LT-3WR2 With External Circuit Power+ (Class B)
WRB2405LT-3WR2 With External Circuit Power- (Class B)
WRB_LT-3WR2
2013.03.12-A/1
Page 3
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MORNSUN
WRB4815LT-3WR2 With External Circuit Power+ (Class B)
WRB4815LT-3WR2 With External Circuit Power- (Class B)
PRODUCT TYPICAL PERFORMANCE CURVE
Temperature Derating Graph
Out put Power Percent(%)
elope Graph
120
100
80
60
Saf e Operating Area
40
20
0
-40
0
40
85 105 120
Percent(%)
Ambient Temp. (
℃
)
(Figure 5)
250
Peak .Temp 240 C
10 Sec Max
220 C
60 Sec Max
(>220 C)
200
Tem per at ur e ( C )
150
100
50
0
Tim e (s ec . )
Remark:
The curve applies only to the hot air reflow soldering
Efficiency VS Input Voltage curve
WRB2405LT-3WR2
(Full Load)
100
95
90
85
80
75
70
65
60
55
50
18
21
24
27
30
33
36
Input Voltage(V)
100
90
80
70
60
50
40
30
20
10
0
Efficiency VS Output Load curve
(Vin=Vin-nominal)
WRB2405LT-3WR2
Efficiency(%)
Efficiency(%)
10
20
30
40
50 60
70
80
90 100
Total Output Current (%)
Efficiency VS Input Voltage curve
WRB4815LT-3WR2
(Full Load)
100
95
90
85
80
75
70
65
60
55
50
36 40 44 48 52 56 60 64 68 72 76 80
Input Voltage(V)
Efficiency VS Output Load curve
WRB4815LT-3WR2
(Vin=Vin-nominal)
100
90
80
70
60
50
40
30
20
10
0
10
20
30
40 50 60 70 80 90 100
Total Output Current (%)
Efficiency(%)
Efficiency(%)
The copyright and authority for the interpretation of the products are reserved by
MORNSUN
WRB_LT-3WR2
2013.03.12-A/1
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OUTLINE DIMENSIONS,RECOMMENDED FOOTPRINT & PACKAGE DIAGRAM
TEST CONFIGURATIONS
Input Reflected-Ripple Current Test Setup
Input reflected-ripple current is measured with an inductor Lin and Capacitor Cin to simulate the source impedance.
Oscilloscope
Lin
Cin
Current
Probe
DC DC
Load
Lin(4.7µH)
Cin(220µF, ESR < 1.0Ω at 100 KHz)
The copyright and authority for the interpretation of the products are reserved by
MORNSUN
WRB_LT-3WR2
2013.03.12-A/1
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