IA0505S-1W5 Datasheet, PDF (3/3 Pages) MORNSUN Science& Technology Ltd. – 2W, FIXED INPUT, ISOLATED & REGULATED DUAL OUTPUT DC-DC CONVERTER

APPLICATION NOTE
1)Requirement on output load
To ensure this module can operate efficiently and reliably, a minimum load is specified for this kind of DC/DC converter in addition to a
maximum load (namely full load). During operation, make sure the specified range of input voltage is not exceeded, 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 (IA_KS –1W/IA_S-1W series).
2)Filtering
To get an extreme low ripple, an “LC” filtering network may be connected to the input and output ends of the DC/DC converter, which may
produce a more significant filtering effect. 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 (see figure 1).
Vin
Cin
GND
L
DC DC
L
+Vo
C out
0V
L Cout
-Vo
(Figure 1)
In some circuits which are sensitive to noise and ripple, a filtering capacitor may be added to the DC/DC output end and input end to reduce the
noise and ripple. 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 the EXTERNAL
CAPACITOR TABLE (see Table 1).
EXTERNAL CAPACITOR TABLE (Table 1)
Vin
Cin
Vout
Cout
(VDC) (μF) (VDC) (μF)
5
4.7
±5
4.7
12
2.2
±9
2.2
24
1
±12
1
--
--
±15
0.47
It’s not recommend to connect any external capacitor in the application field with less than 0.5 watt output.
3)Input Over-voltage Protection Circuit
The simplest device for input over-voltage protection is a linear voltage regulator with overheat protection that is connected to the input end in
series (Figure 2).
+Vo
Vin
REG
DC DC
0V
GND
-Vo
(Figure 2)
4)When the environment temperature is higher than 71°C, the product output power should be less then 60% of the rated power.
5)It is not recommended to increase the output power capability by connecting two or more converters in parallel. The product is not hot-
swappable.
6)Use dual output simultaneously, forbid opening output pin(0V) to use as single output.
Note:
1. Operation under minimum load will not damage the converter; However, they may not meet all specifications.
2. Max. Capacitive Load is tested at nominal input voltage and full load.
3. Unless otherwise noted, All specifications are measured at Ta=25°C, humidity<75%, nominal input voltage and rated output load.
4. In this datasheet, all test methods are based on our corporate standards.
5. All characteristics are for listed models, and non-standard models may perform differently. Please contact our technical support for more detail.
6. Please contact our technical support for any specific requirement.
7. Specifications of this product are subject to changes without prior 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: [phone]
Fax:[phone]
E-mail: [e-mail]
Http://www.mornsun-power.com
The copyright and authority for the interpretation of the products are reserved by MORNSUN
IA_KS-2W & IA_S-2W 2013.08.30-B/1 Page 3 of 5