VRA_LD-20WR2 &
VRB_LD-20WR2 SERIES
20W,WIDE
INPUT, ISOLATED & REGULATED
DUAL/SINGLE OUTPUT DC-DC CONVERTER
FEATURES
●
Efficiency up to 90%
●
2:1 wide input voltage range
●
Output over voltage,over current and Input
under voltage protection,short circuit protection
●
1.5KVDC isolation
●
Operating temperature range:
-40°C ~ +85°C
●
Six-sided metal shield
●
Industry standard pinout
●
Meet CISPR22/EN55022 CLASS A
●
Meet EN60950
●
A2S（chassis mounting）and A4S（DIN-Rail
mounting
）
have the function of input reverse
connection preventing
Patent Protected
RoHS
PART NUMBER SYSTEM
VRA1205LD-20WR2
Rated Power
Package Style
Output Voltage
Input Voltage
Product Series
APPLICATION
VRA_LD-20WR2 & VRB_LD-20WR2 series are applied to
wide voltage range input situation such as data transmission
device, battery power supply device, telecommunication device
,distributed power supply system, remote control system,
industrial robot system etc.
SELECTION GUIDE
Approval
Input
Output
Voltage(VDC)
①
Model
Voltage
Nominal
Max.
②
(VDC)
(Range)
VRA1205LD-20WR2
±5
VRA1212LD-20WR2
VRA1215LD-20WR2
VRA1224LD-20WR2
VRB1203LD-20WR2
VRB1205LD-20WR2
VRB1212LD-20WR2
VRB1215LD-20WR2
CE
VRB1224LD-20WR2
VRA2405LD-20WR2
VRA2412LD-20WR2
VRA2415LD-20WR2
VRA2424LD-20WR2
VRB2403LD-20WR2
VRB2405LD-20WR2
VRB2412LD-20WR2
VRB2415LD-20WR2
VRB2424LD-20WR2
24
(18-36)
40
12
(9-18)
20
±12
±15
±24
3.3
5
12
15
24
±5
±12
±15
±24
3.3
5
12
15
24
Output Current
(mA)
Max.
±2000
±834
±667
±417
5000
4000
1667
1333
834
±2000
±834
±667
±417
5000
4000
1667
1333
834
Min.
±100
±42
±33
±21
250
200
84
67
42
±100
±42
±34
±21
250
200
84
67
42
Input Current (mA)(typ.)
@Max.
Load
1938
1895
1895
1895
1600
1872
1872
1872
1853
969
948
948
948
800
926
937
926
916
@No Load
30
25
25
20
65
60
25
25
30
25
20
20
20
40
40
20
20
20
30
Reflected
Ripple
Current
(mA,typ.)
Max.
Capacitive
Load
③
(µF)
4800
800
500
300
18700
9600
1600
1000
470
4800
800
500
300
18700
9600
1600
1000
470
Efficiency
④
(%, typ.)
@Max.
Load
86
88
88
88
86
89
89
89
90
86
88
88
88
86
90
89
90
90
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VRA_LD-20WR2 & VRB_LD-20W R2 2013.11.29-A/4 Page 1of 9
VRA4805LD-20WR2
VRA4812LD-20WR2
VRA4815LD-20WR2
VRA4824LD-20WR2
CE
VRB4803LD-20WR2
VRB4805LD-20WR2
VRB4812LD-20WR2
VRB4815LD-20WR2
VRB4824LD-20WR2
48
(36-75)
80
±5
±12
±15
±24
3.3
5
12
15
24
±2000
±834
±667
±417
5000
4000
1667
1333
834
±100
±42
±34
±21
250
200
84
67
42
484
474
468
468
400
463
469
463
468
20
15
15
15
25
25
10
10
10
30
4800
800
500
300
18700
9600
1600
1000
470
86
88
89
89
86
90
89
90
89
Note:
①Series
with suffix
“H”
are heat sink mounting; series with suffix
“A2S”
are chassis mounting，
with suffix
“A4S”
are DIN-Rail mounting, for example VRB2405LD-
20WHR2A2S is chassis mounting of with heat sink,VRB2405LD-20WR2A4S is DIN-Rail mounting of without heat sink;If the application has a higher
requirement for heat dissipation, you can choose modules with heat sink;
②Absolute
maximum rating without damage on the converter;
③For
dual-output-converters the given value is for one output (for both outputs the same value);
④The
efficiency of "A2S" and "A4S" is approx. 2% lower for the protection of inverse polarity.
INPUT SPECIFICATIONS
Item
Input Surge Voltage (1sec.max.)
Test Conditions
12VDC input
24VDC input
48VDC input
12VDC input
Start-up Voltage
24VDC input
48VDC input
12VDC input
Under Voltage Shutdown
24VDC input
48VDC input
Start-up Time
Ctrl*
Input Filter
Note: *The Ctrl control pin voltage is refer to GND.
Nominal input& constant resistance load
Models ON
Models OFF
Input current (Models OFF)
Min.
-0.7
-0.7
-0.7
--
--
--
7.5
16
32
--
Typ.
--
--
--
--
--
--
--
--
--
10
Max.
25
50
100
9
17.8
35.8
--
--
--
--
ms
VDC
Unit
Ctrl open or connect TTL high level (2.5-12VDC)
Ctrl connect GND or low level (0-1.2VDC)
--
1
--
mA
Pi Filter
OUTPUT SPECIFICATIONS
Item
Positive Voltage Accuracy
Negative Voltage Accuracy
Output Voltage Balance
Line Regulation
Load Regulation
Cross Regulation
Transient Recovery Time
Transient Response Deviation
Temperature Drift
Ripple & Noise*
Trim
3.3VDC output
5VDC output
Output Over Voltage Protection
12VDC output
15VDC output
24VDC output
Over Current Protection
Short Circuit Protection
Input voltage range
Dual output, balanced loads
Full load, input voltage from low to high
10% to 100% load
Dual output, main output 50% load,
Supplement output from 10% to 100% load
25% load step change
Full load
20MHz bandwidth
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
Test Conditions
Min.
Typ.
±1
±0.5
±0.2
±0.5
--
300
±3
±0.02
70
±10%
3.9
6.2
15
18
30
150
Max.
±3
±1
±0.5
±1
±5
500
±5
--
100
--
--
--
--
--
--
--
%
VDC
µs
%
%/°C
mVp-p
%
Unit
Hiccup, Continuous, automatic recovery
Note: * Ripple and noise tested by
“parallel
cable” method. See detailed operation instructions at
DC-DC application notes.
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VRA_LD-20WR2 & VRB_LD-20W R2 2013.11.29-A/4 Page 2of 9
COMMON SPECIFICATIONS
Item
Isolation Voltage
Isolation Resistance
Isolation Capacitance
Switching Frequency
MTBF
Safety approvals
Case Material
PCB mounting
（Without
heat sink）
PCB mounting
（With
heat sink）
Size
A2S Chassis mounting（Without heat sink）
A2S Chassis mounting（With heat sink）
A4S DIN-Rail mounting（Without heat sink）
A4S DIN-Rail mounting（With heat sink）
Without heat sink（Without heat sink）
With heat sink（With heat sink）
Weight
A2S Chassis mounting（Without heat sink）
A2S Chassis mounting（With heat sink）
A4S DIN-Rail mounting（Without heat sink）
A4S DIN-Rail mounting（With heats ink）
Test Conditions
Input-Output, Tested for 1 minute ,leakage current less than 1 mA
Input-Output, Test at 500VDC
Input/Output,100KHz/0.1V
PWM mode
MIL-HDBK-217F@25℃
Min.
1500
1000
--
--
1000
Typ.
--
--
1000
300
--
Max.
--
--
--
--
--
EN60950
Aluminum Alloy
50.80×25.40×11.80
50.80×25.40×16.30
76.00×31.50×21.20
76.00×31.50×25.10
76.00×31.50×25.80
76.00×31.50×29.70
--
--
--
--
--
--
28
36
50
58
70
78
--
--
--
--
--
--
g
mm
Unit
VDC
MΩ
pF
KHz
K hours
ENVIRONMENTAL SPECIFICATIONS
Item
Storage Humidity
Operating Temperature
Storage Temperature
The Max. Case Temperature
Lead Temperature
Cooling
Shake
Operating Temperature curve range
1.5mm from case for 10 seconds
Test Conditions
Non condensing
See Temperature Derating Curve (Figure 3)
Min.
5
-40
-55
--
--
Typ.
--
--
--
--
--
Max.
95
85
125
105
300
°C
Unit
%
Free air convection
10-55Hz, 10G, 30 Min. along X, Y and Z
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/EN61000-4-5
IEC/EN61000-4-6
IEC/EN61000-4-29
CLASS A
（Without
External Circuit） CLASS B
/
（External
Circuit Refer to Figure1-②）
CLASS A
（Without
External Circuit） CLASS B
/
（External
Circuit Refer to Figure1-②）
Contact
10V/m
±2KV
±2KV
3 Vr.m.s
0%-70%
(External Circuit Refer to Figure1-①)
(External Circuit Refer to Figure1-①)
±4KV
perf. Criteria B
perf. Criteria A
perf. Criteria B
perf. Criteria B
perf. Criteria A
perf. Criteria B
EMC RECOMMENDED CIRCUIT
Re
commended external circuit parameters:
FUSE
V in
+
MOV
GN D
TVS
C1
C0
GND
LD M1
LDM2
CY1
Vi n
+Vo
Model
FUSE
LOAD
Vin:12V
--
--
SMCJ28A
680μF/25V
1μF /50V
Vin:24V
S14K35
56μH
SMCJ48A
330μF/50V
1μF /50V
4.7μH
1nF/2KV
Vin:48V
S14K60
SMCJ90A
330μF/100V
1μF /100V
Choose according to practical input current
EUT
-Vo
(0V)
MOV
LDM1
TVS
C0
C1
LDM2
CY1、CY2
①
②
CY2
(Figure1)
Note: 1. In Figure 1,part
①is
EMS recommended external circuit, part
②is
EMI recommended external circuit(CLASS B). Choose according to
requirements;
2. If there is no recommended parameters, the model no require the external
component.
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VRA_LD-20WR2 & VRB_LD-20W R2 2013.11.29-A/4 Page 3of 9
EMC RECOMMENDED CIRCUIT PCB LAYOUT
(Figure 2)
Note: The pad space between input and output (CY1/CY2) must
≥2mm.
EMC TEST WAVEFORM(CLASS B APPLY CIRCUIT)
VRA2405LD-20WR2
CE (Positive line)
VRA2405LD-20WR2
CE (Negative line)
VRA4815LD-20WR2
CE (Positive line)
VRA4815LD-20WR2
CE (Negative line)
VRA2405LD-20WR2
RE(Horizontal)
VRA2405LD-20WR2
RE(Vertical)
VRA4815LD-20WR2
RE(Horizontal)
VRA4815LD-20WR2
RE(Vertical)
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VRA_LD-20WR2 & VRB_LD-20W R2 2013.11.29-A/4 Page 4of 9
VRB2405LD-20WR2
CE (Positive line)
VRB2405LD-20WR2
CE (Negative line)
VRB4815LD-20WR2
CE (Positive line)
VRB4815LD-20WR2
CE (Negative line)
VRB2405LD-20WR2
RE(Horizontal)
VRB2405LD-20WR2
RE(Vertical)
VRB4815LD-20WR2
RE(Horizontal)
VRB4815LD-20WR2
RE(Vertical)
PRODUCT TYPICAL CURVE
Temperature Derating Curve
120
Output Power Percent (%)
100
80
60
40
20
0
-40
0
40
Without heatsink
Safe Operating Area
With heatsink
120
65 8085
Operating Temp(°C)
(Figure 3)
Efficiency VS Input Voltage curve
VRA1205LD-20WR2
(Full Load)
VRB1205LD-20WR2
100
95
90
Efficiency VS Output Load curve
VRA1205LD-20WR2
(Vin=Vin-nominal)
VRB1205LD-20WR2
100
90
Efficiency(%)
80
75
70
65
60
55
50
9
10
11
12
13
14
15
16
17
18
Efficiency(%)
85
80
70
60
50
40
30
5
10
20
30
40
50
60
70
80
90 100
Input Voltage(V)
Total Output Current (%)
The copyright and authority for the interpretation of the products are reserved by
MORNSUN
VRA_LD-20WR2 & VRB_LD-20W R2 2013.11.29-A/4 Page 5of 9
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