WRA
WRA
WRA
WRA
WRA
WRA
WRA
WRA
-
-
-
-
-
-
-
-
ZD-3W
ZD-3W
ZD-3W
ZD-3W
ZD-3W
ZD-3W
ZD-3W
ZD-3W
&
&
&
&
&
&
&
&
WRB
WRB
WRB
WRB
WRB
WRB
WRB
WRB
-
-
-
-
-
-
-
-
ZD
ZD
ZD
ZD
ZD
ZD
ZD
ZD
-3W
-3W
-3W
-3W
-3W
-3W
-3W
-3W
Series
Series
TYPICAL
TYPICAL
TYPICAL
TYPICAL
TYPICAL
TYPICAL
TYPICAL
TYPICAL
CHARACTERISTICS
CHARACTERISTICS
CHARACTERISTICS
CHARACTERISTICS
CHARACTERISTICS
CHARACTERISTICS
CHARACTERISTICS
CHARACTERISTICS
Temperature Derating Graph
RECOMMENDED
RECOMMENDED
RECOMMENDED
RECOMMENDED
RECOMMENDED
RECOMMENDED
RECOMMENDED
RECOMMENDED
CIRCUIT
CIRCUIT
CIRCUIT
CIRCUIT
CIRCUIT
CIRCUIT
CIRCUIT
CIRCUIT
Output Graph
Output External Capacitor Table(Table 1)
Single
Vout
Cout Dual
Vout
Cout
(VDC) ( μ F) (VDC) ( μ F)
3.3 2200 ± 5 680
5 1000 ± 12 330
12 470 ± 15 220
15 330 -- --
Parameter Conditions Min. Typ. Max. Units
Output power See below products program
0.3 3
W
Positive voltage accuracy Refer to recommended circuit
± 1 ± 3
%
Negative voltage accuracy Refer to recommended circuit
± 3 ± 5
%
Load regulation Form 10% to 100% load
± 0.5 ± 1*
%
Line regulation Input voltage from low to high
± 0.2 ± 0.5
%
Temperature drift (Vout) Refer to recommended circuit
± 0.03
%/ ℃
Ripple** 20MHz Bandwidth
75 150
mVp-p
Noise** 20MHz Bandwidth
75 150
mVp-p
Switching frequency 100% load, input voltage range
300
KHz
* 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.
TEMPERATURE
TEMPERATURE
TEMPERATURE
TEMPERATURE
TEMPERATURE
TEMPERATURE
TEMPERATURE
TEMPERATURE
CHARACTERISTICS
CHARACTERISTICS
CHARACTERISTICS
CHARACTERISTICS
CHARACTERISTICS
CHARACTERISTICS
CHARACTERISTICS
CHARACTERISTICS
http://www.microdc.cn Technical Enquiries-Email:tech@microdc.cn Tel:0086-20-86000646 page 2/3
APPLICATION
APPLICATION
APPLICATION
APPLICATION
APPLICATION
APPLICATION
APPLICATION
APPLICATION
NOTE
NOTE
NOTE
NOTE
NOTE
NOTE
NOTE
NOTE
Requirement
Requirement
Requirement
Requirement on
on
on
on output
output
output
output load
load
load
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
Recommended
Recommended
Recommended Circuit
Circuit
Circuit
Circuit
All the WRA_ Z D- 3 W&WRB_ Z D- 3 W Series have been tested a ccording 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 10 μ F-47 μ F
C out : 10 μ F/100mA
Input
Input
Input
Input current
current
current
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
No
No
No parallel
parallel
parallel
parallel connection
connection
connection
connection or
or
or
or plug
plug
plug
plug and
and
and
and play
play
play
play