WRA-YMT-3W&WRB-YMT-3W
Series
ISOLATION SPECIFICATIONS
Parameter
Isolation voltage
Isolation resistance
Isolation capacitance
TYPICAL CHARECTERISTICS
Min.
1500
1000
1000
Test conditions
Tested for 1 minute and 1mA max
Test at 500VDC
Input/output, 100KHz/1V
Typ.
Max
Units
VDC
MΩ
pF
OUTPUT SPECIFICATIONS
Parameter
Output power
Positive voltage accuracy
Negative voltage accuracy
Load regulation
Line regulation
Temperature Drift (Vout)
Output ripple& noise**
Switching frequency
Test conditions
See above products program
Refer to recommended circuit
Refer to recommended circuit
From 10% to 100% load
Input voltage from low to high
Refer to recommended circuit
20MHz Bandwidth
100% load, nominal input voltage
Min.
0.3
Typ.
Max
3
Units
W
%
%
%
%
%/℃
mVp-p
KHz
±1
±3
±0.5
±0.2
±3
±5
±1*
±0.5
±0.03
35
300
100
* 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.
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_YMT-3W & WRB_YMT-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
100µF
10µF~47µF
RECOMMENDED CIRCUIT
Input Current
When it is used in unregulated power supply, be sure that the fluctuating range of the power supply and
the rippled voltage do not exceed the module standard. Input current of power supply should afford the
flash startup current of this kind of DC/DC module (Figure 2),
General: Ip
≤1.6*Iin-max(Vin=5V)
Ip
≤1.4*Iin-max(Vin=12V/24V/48V)
No parallel connection or plug and play
Technical Enquiries-Email:tech@microdc.cn Tel:0086-20-86000646
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MICRODC [ MICRODC POWER TECHNOLOGY CO., LTD ]
