OUTPUT SPECIFICATIONS
Item
Output power
Positive voltage accuracy
Negative voltage accuracy
Load regulation
Line regulation
Temperature drift (Vout)
Ripple & Noise**
Switching frequency
Test Conditions
Refer to products program
Refer to recommended circuit
Refer to recommended circuit
Form 10% to 100% load
Input voltage from low to high
Refer to recommended circuit
20MHz Bandwidth
100% load, input voltage range
75
300
Min
0.3
±1
±3
±0.5
±0.2
Typ.
Max.
3
±3
±5
±1*
±0.5
±0.03
150
%/°C
mVp-p
KHz
%
Units
W
TYPICAL TEMPERATURE CURVE
*Dual output models unbalanced load:
±5%.
**
Test ripple and noise by
“parallel
cable” method. See detailed operation instructions at Testing of Power
Converter section, application notes.
Operating Temp.(
C
)
COMMON SPECIFICATIONS
Item
Storage humidity
Operating temperature
Storage temperature
Temp. rise at full load
Lead temperature
Cooling
Short circuit protection
Case material
No-load power consumption
Isolation voltage
Isolation resistance
Isolation Capacitance
MTBF
Weight
Tested for1 minute and 1mA max
Test at 500VDC
Input/output
1000
15
1500
1000
100
1.5mm from case for 10 seconds
-40
-55
15
300
Free Air Convection
Continuous, Automatic recovery
Aluminium Alloy
0.2
W
VDC
pF
K hours
g
MΩ
Test Conditions
Min.
Typ.
Max.
95
85
125
°C
Units
%
RECOMMENDED CIRCUIT
Vin
C in
+Vout
DC
DC
0V
-Vout
GND
Single Output
Vin
Cin
+Vout
DC
DC
0V
GND
(Figure 1)
Input Current(A)
Ip
APPLICATION NOTE
Requirement on output load
In order to ensure the product operate efficiently and reliably, in addition to a max load
(namely full load), a minimum load is specified for this kind of DC/DC converter. Make sure the
specified range of input voltage is not exceeded, the minimum output load no less than 10%
load. If the actual load is less than the specified minimum load, the output ripple may increase
sharply while its efficiency and reliability will reduce greatly. If the actual output power is very
small, please add an appropriate resistor as extra loading, or contact our company for other
lower output power products.
Recommended Circuit
All the WRA_YMD-3W & WRB_YMD-3W Series have been tested according to the following
recommended testing circuit before leaving factory. This series should be tested under load
(see Figure 1).
If you want to further decrease the input/output ripple, you can increase capacitance properly
or choose capacitors with low ESR. However, the capacitance of the output filter capacitor must
be proper. If the capacitance is too big, a startup problem might arise. For every channel of
output, provided the safe and reliable operation is ensured, the greatest capacitance of its filter
capacitor sees (Table 1). General:
Cin:
5V&12V
24V&48V
Cout: 10μF/100mA
Input current
While using unstable power source, please ensure the output voltage and ripple voltage do
not exceed indexes of the converter. The preceding power source must be able to provide for
converter sufficient starting current Ip (Figure 2). General: Ip
≤1.4*Iin-max
No parallel connection or plug and play
100μF
10μF-47μF
Input Voltage
Range
Input Voltage (V)
Output External Capacitor Table(Table 1)
Single Vout
Cout
Dual Vout
Cout
(VDC)
(uF)
(VDC)
(uF)
3.3
2200
±5
680
5
1000
±9
470
9
680
±12
330
12
470
±15
220
15
330
-
-
24
220
-
-
The copyright and authority for the interpretation of the products are reserved by Mornsun
Specifications subject to change without notice.
WRA_YMD-3W & WRB_YMD-3W
A/2-2009
Page 2 of 3
MORNSUN [ MORNSUN SCIENCE& TECHNOLOGY LTD. ]
