WRE-YD-3W&WRF-YD-3W Series
TYPICAL CHARACTERISTICS
COMMON SPECIFICATIONS
Item
Test Conditions
Min.
0.3
Typ.
Max.
Units
Output power
Positive voltage accuracy
Negative voltage accuracy
Load regulation
See above products program
Refer to recommended circuit
Refer to recommended circuit
From 10% to 100% load
3
W
%
±1
±3
±3
±5
%
±0.5
±0.2
±1*
±0.5
±0.03
100
%
Line regulation(at full load)
Temperature Drift(Vout)
Ripple & Noise **
Input voltage from low to high
Refer to recommended circuit
20MHz Bandwidth
%
%/℃
mVp-p
KHz
50
Switching frequency
100% load, input voltage range
300
* 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.
RECOMMENDED CIRCUIT
APPLICATION NOTE
1) 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.
2) Recommended Circuit
All the WRE_YD-3W & WRF_YD-3W 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).
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 Input
Voltage capacitance of its filter capacitor sees (Table 1).
General: Cin: 12V
24V&48V 10µF-47µF
Cout: 10µF/100mA
100µF
3) 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 startup
current of this kind of DC/DC module. (Figure 2)
EXTERNAL CAPACITOR TABLE (TABLE 1)
General: Ip ≤1.4*Iin-max
Output External Capacitor Table (Table 1)
4) No parallel connection or plug and play
Single Vout
(VDC)
Cout
(uF)
Dual Vout
(VDC)
Cout
(uF)
5
1000
680
470
330
220
±5
±9
±12
±15
-
680
470
330
220
-
9
12
15
24
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Technical Enquiries-Email:tech@microdc.cn Tel:0086-20-86000646
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