ISOLATION SPECIFICATIONS
TYPICAL CHARACTERISTICS
Item
Test conditions
Min.
Typ. Max. Units
Isolation voltage
Isolation resistance
Tested for 1 minute and 1mA max 1000
VDC
Test at 500VDC
1000
MΩ
OUTPUT SPECIFICATIONS
Item
Test conditions
Min
0.1
Typ
Max Units
Output power
Line regulation
1
±1.2
15
W
%
For Vin change of 1%
10% to 100% load (5V output)
10% to 100% load (9V output)
10% to 100% load (12V output)
10% to 100% load (15V output)
12.8
8.3
6.8
6.3
15
Load regulation
%
15
15
Output voltage accuracy
Temperature drift
See tolerance envelope graph
100% full load
0.03 %/°C
A_XD-1W
B_XD-1W
50
75
75
20MHz
Bandwidth
Ripple & Noise*
mVp-p
100
Switching frequency
Full load, nominal input
100
KHz
*Test ripple and noise by “parallel cable” method. See detailed operation instructions at Testing
of Power Converter section, application notes.
Operating Temp.(oC)
Note: Dual output models unbalanced load: ±5%.
APPLICATION NOTE
RECOMMENDED CIRCUIT
Dual Output
L
Requirement on output load
L
+Vo
0V
Vin
Cout
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).
Cin
DC
DC
DC
DC
Cout
L
L
GND
-Vo
Single Output
Vin
L
+Vo
0V
Cout
Cin
GND
Recommended testing and application circuit
(Figure 1)
DC DC
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).
Dual Output
+Vo
REG
REG
REG
Vin
REG
0V
GND
-Vo
Single Output
+Vo
0V
Vin
REG
DC
DC
GND
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)
Vin Cin Single Cout Dual Cout
(VDC) (uF)
Vout (uF)
(VDC)
Vout
(VDC)
(uF)
Overload Protection
5
12
24
-
4.7
2.2
1
5
9
10
4.7
2.2
1
±5
±9
4.7
2.2
1
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.
12
15
±12
±15
-
1
It’s not recommended to connect any external
capacitor in the application field with less than 0.5
watt output.
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. ]
