WRA-ZD-8W
＆
WRB-ZD -8W
Series
Parameter
Output power
Positive voltage accuracy
Negative voltage accuracy
Load regulation
Line regulation
Temperature drift (Vout)
Ripple**
Noise**
Switching frequency
Conditions
See below 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
20MHz Bandwidth
100% load, input voltage range
Min.
0.6
Typ.
Max.
6
Units
W
%
%
%
%
%/℃
Temperature Derating Graph
±1
±3
±0.5
±0.2
±0.02
20
50
300
±3
±5
±2*
±0.5
50
100
mVp-p
mVp-p
KHz
RECOMMENDED CIRCUIT
* 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.
Output Graph
Case material
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
the actual
load.If
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_ZD-8W&WRB_ZD-8W 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 should not be too high, or may cause start-up problem.
General:
Cin: 24V＆48V 10μF-47μF
Cout: 10μF/100mA
Input current
Output External Capacitor Table(Table 1)
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≤1.6*Iin-max
No parallel connection or plug and play
Single Vout
Cout
(μF)
2200
1000
470
330
Dual Vout
(VDC)
±5
±12
±15
--
Cout
(μF)
680
330
220
--
(VDC)
3.3
5
12
15
OUTLINE DIMENSIONS
＆
FOOTPRINT DETAILS
Technical Enquiries-Email:tech@microdc.cn Tel:0086-20-86000646
page 3/4
MICRODC [ MICRODC POWER TECHNOLOGY CO., LTD ]
