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. For these DC-DC converters,
You can reduce the design point of failure and save the
development of micro power supply‘s manpower, material and
time costs, also better ensure product quality stability, protect
safety and reliability of the end of products.
These products apply to where:
1) Input voltage range
≤2:1;
2) 3.0KVDC input and output isolation;
3) Regulated and low ripple noise is required.
SELECTION GUIDE
Model
Input Voltage(VDC)
Nominal
①
Max.
(Range)
Output
Voltage
(VDC)
3.3
12
(9-18)
5
20
12
15
3.3
5
24
(18-36)
40
12
15
24
3.3
48
(36-75)
5
80
12
15
250
200
12
10
74
74
250
200
909
600
250
200
125
909
600
12
10
45
30
12
10
6
45
30
316
316
166
156
152
152
157
84
78
7
45
680
470
83
83
7
110
Output Current (mA)
Max.
909
600
Min.
45
30
Input Current (mA)(Typ.)
@Max.
Load
342
323
20
30
680
470
2700
2200
680
470
330
2700
2200
79
79
74
81
82
82
80
74
80
@No
Load
Reflected
Ripple
Current
(mA,Typ.)
Max.
Capacitive
Load (µF)
2700
2200
Efficiency
(%, Typ.)
@Max.
Load
74
77
WRF1203MT-3W
WRF1205MT-3W
WRF1212MT-3W
WRF1215MT-3W
WRF2403MT-3W
WRF2405MT-3W
WRF2412MT-3W
WRF2415MT-3W
WRF2424MT-3W
WRF4803MT-3W
WRF4805MT-3W
WRF4812MT-3W
WRF4815MT-3W
Note:①.Absolute maximum rating without damage on the converter.
INPUT 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
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2013.06.26-A/1
Page 1 of 6
Min.
-0.7
-0.7
-0.7
4.5
11
24
Typ.
--
--
--
--
--
--
Capacitor
Max.
25
50
100
9
18
36
Unit
VDC
Models ON
Ctrl*
Models OFF
Note: *Please refer to "DESIGN CONSIDERATIONS" as the direction for use of Ctrl .
Ctrl open or be insulated
Connect high level voltage,and ensure the current into Ctrl
to be 5-10mA
OUTPUT SPECIFICATIONS
Item
Output Voltage Accuracy
No-load Output Voltage Accuracy
Line Regulation
Load Regulation
Transient Recovery Time
25% load step change
Transient Response Deviation
Temperature coefficient
Ripple*
20MHz Bandwidth
Noise*
Output Short Circuit Protection
Input voltage range
--
45
100
Continuous, automatic recovery
100% load
--
--
--
Test Conditions
5% to 100% load
Input voltage range
Full load, Input voltage from low to high
5% to 100% load
Min.
--
--
--
--
--
Typ.
±1
±1.5
±0.2
±0.2
0.5
±2.5
±0.02
30
Max.
±3
±5
±0.5
±0.8
3
±5
±0.03
45
ms
%
%/°C
mVp-p
%
Unit
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
Test Conditions
Input-Output, Tested for 1 minute, leakage current less than 1 mA
Input-Output, Test at 500VDC
Input-Output,100KHz / 0.1V
Min.
3000
1000
--
--
1000
Typ.
--
--
35
250
--
Max.
--
--
45
--
--
Unit
VDC
MΩ
pF
KHz
K hours
Switching Frequency(PFM Mode) 100% load, Nominal Input voltage
MTBF
Case Material
Weight
MIL-HDBK-217F@25℃
Epoxy Resin (UL94-V0)
--
4.8
--
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 (above85℃,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
IEC/EN61000-4-29
CLASS B(Recommended Circuit Refer to Figure1-② or Figure 3)
CLASS B(Recommended Circuit Refer to Figure1-② or Figure 3)
Contact
±4KV/
Air
±8KV
10V/m
±2KV
±4KV
±2KV
3 Vr.m.s
0%-70%
(Recommended Circuit Refer to Figure1-①)
(Recommended Circuit Refer to Figure 3)
(Recommended Circuit Refer to Figure1-① or Figure 3)
perf. Criteria B
perf. Criteria A
perf. Criteria B
perf. Criteria B
perf. Criteria B
perf. Criteria A
perf. Criteria B
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Page 2 of 6
EMC RECOMMENDED CIRCUIT
FU S E
Vin
+
MOV
GND
TV S
C1
C0
C2
Cd
GND
0V
C tr l
D1
R
C tr l
LD M1
L DM2
Vin
+ Vo
EUT
LOAD
①
②
(Figure 1)
CY
③
Recommended external circuit param eters:
Model
FUSE
MOV
LDM1
TVS
C0
C1
LDM2
C2
CY
D1
R
Cd
Note:
Vin:12V
--
--
SMCJ28A
680uF/50V
Vin:24V
Slow blow ,choose according to actual input current
S14K35
56μH
SMCJ48A
330μF/50V
4.7μF/50V
12μH
4.7μF/50V
1nF/3KV
RB160M-60/1A
Follows:
Vin:48V
S14K60
56μH
SMCJ90A
330μF/100V
4.7μF/100V
4.7μF/100V
R
=
V
C
-
V
D
- 1.0
- 300
I
C
47nF/100V
1. In Figure 1, part
①
is the recommended external circuit for EMS, and part
②
is for EMI. Choose according to requirements;
2. If there is no recommended parameters, the model no require the external component;
3. VC is the voltage Between Ctrl and GND, VD is the forward conduction voltage drop of D1, IC is the current through Ctrl pin which is normally 5-10mA, the
external circuit of Ctrl is as shown in figure1-③.
EMC RECOMMENDED CIRCUIT PCB LAYOUT
(Figure 2)
Note: The pad space between input and output GND (CY) must be≥2mm.
EMC MODULE APPLICATION CIRCUIT
FUSE
+Vin
L DM
+Vin
Vin
Ct rl
D1
Cd
R
Ctrl
GND
0V
+Vo
+
C
-Vin
-Vin
FT-A/BX1 D
+Vo
-Vo
EU T
L oad
C1
FT-A/BX1D is MORNSUN’s EFT suppresser. For specific model, please refer to the selection guide.
For nominal voltage <48V,C≥330μF/50V
For nominal voltage =48V,C≥330μF/100V
LDM=12uH,C1=1nF/3000V
(Figure 3)
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WRF_MT-3W
2013.06.26-A/1
Page 3 of 6
EMC MODULE RECOMMENDED CIRCUIT PCB LAYOUT
(Figure 4)
EMI TEST WAVEFORM (NOMINAL AND FULL LOAD)
WRF2405MT-3W CE(Class B, Positive line)
WRF2405MT-3W CE(Class B, Negative line)
PRODUCT TYPICAL PERFORMANCE CURVE
Temperature Derating Graph
O u tp u t P o w e r P e rce n t(% )
120
10 0
80
60
Safe Operatin g Area
40
20
0
-40
0
40
85 10 5 12 0
0
200
250
ph
Peak . Temp 240
℃
10Sec Max .
220
℃
.
60 Sec M ax
( > 220
℃
)
Temperatur e (
℃
)
150
100
50
Ambient Te mp.(
℃
)
Time (sec .)
(Figure 5)
Efficiency VS Input Voltage curve
WRF2405MT-3W
(Full Load)
100
95
90
85
80
75
70
65
60
55
50
18
20
22
24
26
28
30
32
34
36
Note: The curve only applies to the hot air reflow soldering
100
90
80
70
60
50
40
30
20
10
0
Efficiency VS Output Load curve
(Vin=Vin-nominal)
WRF2405MT-3W
Efficiency(%)
Efficiency(%)
10
20
Input Voltage(V)
30 40 50 60 70 80 90 100
Total Output Current (%)
Efficiency VS Input Voltage curve
WRF4815MT-3W
(Full Load)
100
95
90
85
80
75
70
65
60
55
50
36
42
45
48
54
60
66
69
72
75
100
90
80
70
60
50
40
30
20
10
0
Efficiency VS Output Load curve
(Vin=Vin-nominal)
WRF4815MT-3W
Efficiency(%)
Efficiency(%)
10
20
Input Voltage(V)
30 40 50 60 70 80 90 100
Total Output Current (%)
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WRF_MT-3W
2013.06.26-A/1
Page 4 of 6
DIMENSIONS，RECOMMENDED FOOTPRINT & PACKAGING
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)
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