WRB_MT-3W Series
3W，
WIDE INPUT, ISOLATED & REGULATED
SINGLE OUTPUT , DC-DC CONVERTER
FEATURES
●Efficiency
up to 83%
●2:1
wide input voltage range
●Operating
Temperature range: -40 ~ +85℃
●No
Power derating (≤85
℃
)
●1.5KVDC
isolation
●Ultra-Miniature,
SMD Package
●Short
Circuit Protection(automatic recovery)
●Low
no-load power consumption
●External
On/Off control
APPLICATION
The WRB_MT-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. 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) 1.5KVDC input and output isolation;
3) Regulated and low ripple noise is required.
Patent Protected RoHS
PART NUMBER SYSTEM
WRB2405MT-3W
R a te d P o w e r
P a c k a g e S ty l e
O u tp u t Vo l ta g e
In p u t Vo l ta g e
P r o d u c t S e ri e s
SELECTION GUIDE
Model
WRB1203MT-3W
WRB1205MT-3W
WRB1212MT-3W
WRB1215MT-3W
WRB2403MT-3W
WRB2405MT-3W
WRB2412MT-3W
WRB2415MT-3W
WRB2424MT-3W
WRB4803MT-3W
WRB4805MT-3W
WRB4812MT-3W
WRB4815MT-3W
48
(36-75)
80
12
15
250
200
12
10
74
74
24
(18-36)
40
12
(9-18)
20
12
15
3.3
5
12
15
24
3.3
5
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
Input Voltage(VDC)
Nominal
①
Max.
(Range)
Output
Voltage
(VDC)
3.3
5
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
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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Min.
-0.7
-0.7
-0.7
4.5
11
24
Typ.
--
--
--
--
--
--
Capacitor
Max.
25
50
100
9
18
36
Unit
VDC
Ctrl*
Models ON
Models OFF
Ctrl open or be insulated
Connect high level voltage,and ensure the current into Ctrl to be 5-10mA
Note: *Please refer to "DESIGN CONSIDERATIONS" as the direction for use of Ctrl .
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*
Noise*
Output Short Circuit Protection
Input voltage range
100% load
20MHz Bandwidth
--
--
--
--
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
45
Max.
±3
±5
±0.5
±0.8
3
±5
±0.03
45
100
ms
%
%/°C
mVp-p
%
Unit
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
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.
1500
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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EMC RECOMMENDED CIRCUIT
FUSE
Vi n
+
MO V
GND
TVS
C1
C0
C2
Cd
GND
0V
C trl
D1
R
C trl
L D M1
L D M2
Vi n
+Vo
EUT
L O AD
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
Choose according to actual input current
S14K35
56μH
SMCJ48A
330μF/50V
4.7μF/50V
12μH
4.7μF/50V
1nF/2KV
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,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;
3.
V
C
is the voltage to GND from Ctrl,
V
D
is the forward conduction voltage drop of D1,
I
C
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 space between input and output GND (CY) must≥2mm.
EMC MODULE APPLICATION CIRCUIT
FU SE
+V in
LDM
+Vin
V in
C t rl
D1
Cd
R
C trl
GN D
0V
+Vo
+
C
-Vin
-Vin
FT- A/BX1 D
+Vo
-Vo
EU T
Load
C1
FT-A/BX1D is MORNSUN’s EFT suppresser
For nominal voltage <48V,C≥330μF/50V
For nominal voltage =48V,C≥330μF/100V
LDM=12uH,C1=1nF/2000V
(Figure 3)
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EMC MODULE RECOMMENDED CIRCUIT PCB LAYOUT
(Figure 4)
EMI TEST WAVEFORM (RECOMMENDED CIRCUIT FINGURE 1-②)
WRB2405MT-3W CE(Class B, Positive line)
WRB2405MT-3W CE(Class B, Negative line)
PRODUCT TYPICAL PERFORMANCE CURVE
Temperature Derating Graph
O u t pu t P o w e r P e rce n t(% )
12 0
100
80
60
Safe Operatin g Area
40
20
0
-40
0
40
85 10 5 120
0
2 00
2 50
raph
Pea k.Tem p 240
℃
10S ec Max.
22 0
℃
.
60 Se c Max
( > 2 20
℃
)
Temperature (
℃
)
1 50
1 00
50
%)
Ambient Temp.(
℃
)
Time (sec. )
(Figure 5)
Note: The curve only applies to the hot air reflow soldering
Efficiency VS Input Voltage curve
(Full Load)
WRB2405MT-3W
100
95
90
85
80
75
70
65
60
55
50
Efficiency VS Output Load curve
(Vin=Vin-nominal)
WRB2405MT-3W
100
90
80
70
60
50
40
30
20
10
0
10
20
30
40
50
60
70
80
90 100
18
21
24
27
30
33
36
Input Voltage(V)
Efficiency(%)
Efficiency(%)
Total Output Current (% )
Efficiency VS Input Voltage curve
(Full Load)
WRB4815MT-3W
100
95
90
85
80
75
70
65
60
55
50
36 42 45 48 54 60 66 69 72 75
Efficiency VS Output Load curve
(Vin=Vin-nominal)
WRB4815MT-3W
100
90
80
Efficiency(%)
Efficiency(%)
70
60
50
40
30
20
10
0
10
20
30
40
50
60
70
80
90
100
Input Voltage(V)
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Total Output Current (%)
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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