VRA_LD-20W Series
20W, 2:1 WIDE INPUT ISOLATED &
REGULATED
DUAL OUTPUT DC-DC CONVERTER
FEATURES
●
Efficiency up to 89%
●
Wide input voltage range(
2:1)
●
Good low and high temperature features
●
Output short circuit protection
●
Isolation voltage:
1500VDC
●
Operating temperature:
-40℃
~
+85℃
●
Internal SMD construction
●
Six-sided metal shield
●
Industry standard pinout
●
MTBF>1,000,000 hours
●
Industrial level specifications
●
EMC application
Patent Protection
RoHS
PRODUCT PROGRAM
Model
Input
Voltage
(VDC)
(1)
Nominal Range Max
Output
Capacitor
Load Efficiency
Rated
Voltage
Max (3)
(%, Typ)
Current
(VDC)
(µF)
(2) (mA)
±5
±2000
±833
±667
±416
±2000
±833
±667
±416
±2000
±833
±667
±416
±4800
±800
±500
±300
±4800
±800
±500
±300
±4800
±800
±500
±300
84
88
88
87
84
89
88
87
85
87
88
87
±12
±15
±24
±5
±12
±15
±24
±5
±12
±15
±24
VRA1205LD-20W
VRA1212LD-20W
VRA1215LD-20W
VRA1224LD-20W
VRA2405LD-20W
VRA2412LD-20W
VRA2415LD-20W
VRA2424LD-20W
VRA4805LD-20W
VRA4812LD-20W
VRA4815LD-20W
VRA4824LD-20W
48
36~75
80
24
18~36
40
12
9~18
20
APPLICATION
VRA_LD-20W series offer 20W of
output, wide input voltage: 9-18VDC,
18-36VDC, 36-75VDC,Dual output, and
features 1500VDC isolation, Under
voltage lockout, over current, over
voltage and short circuit protection. All
models are particularly suited to
tele-communications, industrial, test
equipments power etc.
Note: Add suffix
“H”
for heat sink mounted, for example VRA2405LD-20WH.
COMMON SPECIFICATIONS
Item
Storage Humidity
Operating Temperature
Storage Temperature
Maximum Case Temp.
Lead Temperature
On working temperature
1.5mm from case for 10S
Test time:1min,Leakage current: < 1mA
Isolation voltage :500VDC
100kHz/0.1V
100% load, nominal input voltage
MIL-HDBK-217F
Without heatsink
With heatsink
Cooling
Case Material
Test conditions
Min.
5
-40
-55
--
--
1500
1000
--
--
1000
--
--
Typ.
--
--
--
--
--
--
--
2000
400
--
28
36
Max.
95
85
125
105
300
--
--
--
--
--
--
--
VDC
MΩ
pF
kHz
K.hours
g
℃
Units
%
MODEL SELECTION
VRA2405LD-20W
Rate d Power
P ackage
Outp ut Vo ltag e
Inp ut Vo ltage
Pro duct Serie s
Insulation Voltage
Isolation Resistance
Isolation Capacitance
Switching Frequency
MTBF
Weight
Free air convection
Aluminum Alloy
MORNSUN Science & Technology Co.,Ltd.
Address: No. 5, Kehui St. 1, Kehui development
center, Science Ave., Guangzhou Science City,
Luogang district, Guangzhou,P.R.China.
Tel: 86-20-38601850
Fax:86-20-38601272
E-mail: info@mornsun.cn
Http://www.mornsun-power.com
INPUT SPECIFICATIONS
Item
Test conditions
Nominal Input
(12V)
Under Voltage
Lockout
Nominal Input
(24V)
Nominal Input
(48V)
Input Filter
Start-up Time
Ctrl(4)
Nominal input& constant resistance load
Models ON
Models OFF
Input current (Models OFF)
--
--
--
10
Models ON
Models OFF
Models ON
Models OFF
Models ON
Models OFF
Min.
--
7.8
--
16.0
--
32.0
Typ.
--
--
--
--
--
--
Max.
9.0
--
17.8
--
33.5
--
Pi
--
Units
VDC
ms
3.5 -12VDC OR Open Circuit
0-1.2VDC
1
mA
The copyright and authority for the interpretation of the products are reserved by
MORNSUN
Specifications subject to change without notice.
VRA_LD-20W
2013.06.13-A/3
Page 1 of 4
EMI SPECIFICATIONS
Item
Conduction
Radiation
Test conditions
Refer to recommended circuit
EN55022/CLASS B
Test Standard
OUTPUT SPECIFICATIONS
Item
Output Power
Output Voltage Accuracy
Load Regulation
Voltage Regulation
RECOMMENDED CIRCUIT
Min.
2
--
--
--
Typ.
--
±1
±0.5
±0.2
Max.
20
±3
±1
±0.5
%
Test conditions
See product program
Refer to recommended circuit
From 10% to 100% load input
Input voltage from low to high
100% load
Main load 55% load,
Supplement output from 10%
to 100% load
20MHz bandwidth
Unit
W
1) Recommended Circuit
All the URA_LD-20W series have been tested
according to the following recommended testing circuit
before leaving factory. This series should be tested under
load. Never be tested under no load (see Figure 1).
Dual Output
Vin
Cin
+Vo
Cout
DC
DC
Cout
0V
-Vo
Cross Regulation
Ripple
Noise
Transient Recovery Time
--
--
--
--
--
40
75
200
±3
140
±5
50
mV
GND
(Figure 1)
100
500
±5
150
us
%
If you want to further decrease the output ripple, you can
increase capacitance properly or choose capacitors with
low ESR. However, the capacitance can’t exceed the
maximum capacitor load in the list.
25% rated load range
Transient Peak Deviation
Over Current Protection
Short Circuit Protection
Full input voltage
Full input voltage
±5V
output
±12V
output
Over Voltage Protection
±15V
output
±24V
output
Temperature Drift
Refer to recommended circuit
--
--
--
±18
±28
±0.02
--
--
--
%/℃
3) No parallel connection or plug and play
--
120
2) Recommended capacitance
%
Capacitance
Cout (μF)
Output voltage
±5(VDC)
±12(VDC)
VDC
±15(VDC)
±24(VDC)
±220
±100
±100
±47
Cin (μF)
Hiccup,
continual, auto-recovery
--
--
±6.1
±15
--
--
100
TEMPERATURE DERATING CURVE
(Output voltage≤5V)
120
100
Output Power (%)
With heatsink
(Output voltage>5V)
80
60
40
20
Without heatsink
Safe Operating Area
0
-40
0
40 5565 85
120
Operating T
emp(°C)
Output Power (%)
Operating Temp( C)
The copyright and authority for the interpretation of the products are reserved by
MORNSUN
Specifications subject to change without notice.
VRA_LD-20W
2013.06.13-A/3
Page 2 of 4
EMC TEST CONSIDERATIONS
Recommended circuit(EN55022 CLASS B conducted emission application)
Recommended PCB layout with filter
To meet conducted emissions(EN55022 CLASS B)following components are needed:
VRA12/24XXLD-20W:
Component
C1,C2
C3,C4
L1(Common Choke)
Value
4.7µF
1000pF
1250µH
Voltage
50V
2KV
—
Reference
1210MLCC
1206MLCC
P/N:(Refer follow)
VRA48XXLD-20W:
Component
C1,C2
C3,C4
L1(Common Choke)
Value
1.0µF
1000pF
1250µH
Voltage
100V
2KV
—
Reference
1210MLCC
1206MLCC
P/N: (Refer follow)
This common choke L1 has been defined as
follow(Can be assembled by hand):
■
Core:P5T14*8*7,Base（Optical）
L:1250µH
±25%/DCR:250mΩ,max
■
Wire: diameter 0.4mm
A Height:11.2mm,max
B Terminal Length: 4.0mm,max
C Terminal Pitch: 7.5mm,max
D Terminal Pitch: 7.5mm,max
■
Test condition: 100KHz/100mV
■
Recommended through hole:
Ø0.9mm
■
All dimensions in millimeters
The copyright and authority for the interpretation of the products are reserved by
MORNSUN
Specifications subject to change without notice.
VRA_LD-20W
2013.06.13-A/3
Page 3 of 4
OUTLINE DIMENSIONS & PIN CONNECTIONS
HEATSINK ASSEMBLY&PACKAGE DIAGRAM (WITH HEATSINK)
NOTES
1. Input voltage can’t exceed this value, or will cause the permanent damage.
2. Minimum operating current for 10% of rated current, if less than 10% rated current, output ripple may increase rapidly, the amplitude
≤
1V.
3. Capacitor MAX load tested at nominal input voltage and constant resistive load.
4. The CTRL control pin voltage is referenced to GND.
5. Only typical model listed. Non-standard models will be different from the above, please contact us for more details.
6. All specifications are measured at TA=25°C, humidity<75%, nominal input voltage and rated output load unless otherwise specified.
7. In this datasheet, all the test methods of indications are based on corporate standards.
The copyright and authority for the interpretation of the products are reserved by
MORNSUN
Specifications subject to change without notice.
VRA_LD-20W
2013.06.13-A/3
Page 4 of 4
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