COMMONT SPECIFICATIONS
Item
Storage Humidity
Operating Temperature
Storage Temperature
Temp. Rise at Full Load Case surface
Lead Temperature
Isolation voltage
Isolation resistance
Isolation capacitance
Switching Frequency
MTBF
Cooling
Case material
Weight
1.5mm from case for 10 seconds
Tested for 1 minute and 1 mA max 1500
Test at 500VDC
100KHz /0.1V
Nominal, full load
1000
1000
1000
500
-40
-55
50
300
VDC
MΩ
pF
KHz
K hours
Free Air Convection
Nickel- coated copper
30
g
Test conditions
Min.
Typ.
Max.
95
85
105
°C
Units
%
DERATING & EFFICIENCY CURVE
1. Temperature derating curve
Output Power (%)
Operating Temp( C)
2. Efficiency Vs Input voltage
VRA2412LD-15W
Efficiency VS Input voltage
Efficiency
(%)
90
89
88
87
86
85
84
83
82
18
20
22
24
26
28
30
32
34
36
Input voltage(V)
APPLICATION NOTE
①
Recommended circuit
All the VRA_LD-15W & VRB_LD-15W 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
GND
Single Output
Vin
Cin
+Vo
DC
DC
Cout
GND
0V
(Figure 1)
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.
②
Recommended capacitance
To ensure these series can operate efficiently and reliably, the recommended capacitance
of input and output sees the below table.
Capacitance
Output Voltage
Single
3.3V,5V
12V,15V
Dual
±5V
±12V,±15V
220uF
100uF
±220uF
±100uF
100uF
Cin
3. Efficiency Vs Output Power
VRA2412LD-15W
Efficiency VS Output load
Efficiency
(%)
90
80
70
60
50
40
30
20
10
0
0 10 20 30 40 50 60 70 80 90 100
Output load (%)
Cout
(
12V,24V,48V
Input)
OUTPUT VOLTAGE TRIM UP/DOWN
+V0
Trim
Trim
+Vo
0V
Trim up/d own
0V
Trim up
Trim
Trim down
The copyright and authority for the interpretation of the products are reserved by Mornsun
Specifications subject to change without notice.
VRA_LD-15W & VRB_LD-15W
A/4-2009
Page 2 of 3
MORNSUN [ MORNSUN SCIENCE& TECHNOLOGY LTD. ]
