ISOLATION SPECIFICATIONS
Item
Isolation voltage
Isolation resistance
Test conditions
Min.
Typ.
Max.
Units
VDC
MΩ
Tested for 1 minute and 1mA max 1000
Test at 500VDC
1000
TYPICAL CHARACTERISTICS
OUTPUT SPECIFICATIONS
Item
Output power
Line regulation
For Vin change of 1%
10% to 100% load (5V output)
Load regulation
10% to 100% load (9V output)
10% to 100% load (12V output)
10% to 100% load (15V output)
Output voltage accuracy
Temperature drift
Ripple & Noise*
Switching frequency
100% full load
20MHz
Bandwidth
A_XD-1W
B_XD-1W
50
75
100
12.8
8.3
6.8
6.3
Test conditions
Min
0.1
Typ
Max
1
±1.2
15
15
15
15
%
Units
W
%
See tolerance envelope graph
0.03
75
100
KHz
Operating Temp.(
o
C)
%/°C
mVp-p
Full load, nominal input
*Test ripple and noise by
“parallel
cable” method. See detailed operation instructions at Testing
of Power Converter section, application notes.
Note: Dual output models unbalanced load:
±5%.
APPLICATION NOTE
Requirement on output load
To ensure this module can operate efficiently and reliably, During operation, the
minimum output load is
not less than 10%
of the full load, and that this product should
never be operated under no load!
If the actual output power is very small, please
connect a resistor with proper resistance at the output end in parallel to increase the load,
or use our company’s products with a lower rated output power (A/B_XD-W25 Series).
RECOMMENDED CIRCUIT
Dual Output
L
L
Vin
Cin
+Vo
Cout
DC DC
GND
Single Output
L
L Cout
0V
-Vo
L
Vin
Cin
+Vo
Cout
DC DC
GND
0V
Recommended testing and application circuit
If you want to further decrease the input/output ripple, an
“LC”
filtering network may be
connected to the input and output ends of the DC/DC converter, see (Figure 1).
It should also be noted that the inductance and the frequency of the
“LC”
filtering
network should be staggered with the DC/DC frequency to avoid mutual interference.
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).
Single Output
Vin
GND
REG
(Figure 1)
Dual Output
Vin
GND
REG
REG
+Vo
0V
DC DC
REG
-Vo
REG
+Vo
DC DC
0V
Output Voltage Regulation and Over-voltage Protection Circuit
The simplest device for output voltage regulation, over-voltage and over-current
protection is a linear voltage regulator with overheat protection that is connected to the
input or output end in series (Figure 2).
(Figure 2)
EXTERNAL CAPACITOR TABLE (Table 1)
Cin Single Cout Dual Cout
Vin
(VDC) (uF)
Vout (uF)
Vout
(uF)
(VDC)
(VDC)
5
4.7
5
10
±5
4.7
12
2.2
9
4.7
±9
2.2
24
1
12
2.2
±12
1
-
-
15
1
±15
1
It’s not recommended to connect any external
capacitor in the application field with less than 0.5
watt output.
Overload Protection
Under normal operating conditions, the output circuit of these products has no
protection against overload. The simplest method is to connect a self-recovery fuse in
series at the input end or add a circuit breaker to the circuit.
No parallel connection or plug and play
The copyright and authority for the interpretation of the products are reserved by Mornsun
Specifications subject to change without notice.
A_XD-1W & B_XD-1W
A/1-2009
Page 2 of 3
MORNSUN [ MORNSUN SCIENCE& TECHNOLOGY LTD. ]
