DESIGN & APPLY CONSIDERATIONS
1) Requirement on output load
To ensure this module can operate efficiently and reliably, During operation, the minimum output load
could not be less than 10% of the full
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 (B_(X)T-W2 series).
2) 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.
Input Fuse Selection Guide
3.3VDC Input Models
5VDC Input Models
12VDC Input Models
500mA slow-Blow Type
500mA slow-Blow Type
200mA slow-Blow Type
15VDC Input Models
24VDC Input Models
100mA slow-Blow Type
100mA slow-Blow Type
3) Recommended circuit
If you want to further decrease the input/output ripple, an capacitor filtering network may be connected to the input and output ends of the DC/DC
converter, see (Figure 2).
It should also be noted that the capacitance of 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 recommended capacitance of its filter capacitor sees (Table 1).
Vin
Cin
+Vo
DC DC
Cout
GND
0V
(Figure 2)
EXTERNAL CAPACITOR TABLE (TABLE 1)
Vin
Cin
Single Vout
Cout
(VDC)
(µF)
(VDC)
(µF)
3.3/5
4.7
3.3/5/6
10
12
15
24
2.2
2.2
0.47
7.2/9
12
15
4.7
2.2
1
-
-
24
0.47
It’s not recommended to connect any external capacitor in the application field with less than 0.5 watt output.
4) Output Voltage Regulation and Over-voltage Protection Circuit
The simplest device for output voltage regulation, over-voltage and over-current protection is a linear regulator and an capacitor filtering network
with overheat protection that is connected to the input or output end in series (Figure 3), the recommended capacitance of its filter capacitor sees
(Table 1), linear regulator based on the actual voltage and current to reasonable selection.
Vin
GND
REG
REG
+Vo
DC DC
0V
（Figure
3）
5) No parallel connection or plug and play
Note:
1. Operation under minimum load will not damage the converter; However, they may not meet all specification listed, and that will reduce the
life of product.
2. All specifications measured at Ta=25°C, humidity<75%, nominal input voltage and rated output load unless otherwise specified.
3. In this datasheet, all the test methods of indications are based on corporate standards.
4. Only typical models listed, other models may be different, please contact our technical person for more details.
5. Our company offer custom products.
6. Specifications subject to change without notice.
MORNSUN Science & Technology Co.,Ltd.
Address: No. 5, Kehui St. 1, Kehui development center, Science Ave., Guangzhou Science City, Luogang district, Guangzhou,P.R.China.
Tel: 86-20-28203030
Fax:86-20-28203068
The copyright and authority for the interpretation of the products are reserved by MORNSUN
B_(X)T-1W
B/2-2011
Page 5 of 5
MORNSUN [ MORNSUN SCIENCE& TECHNOLOGY LTD. ]
