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B1212S-2W Datasheet(PDF) 5 Page - MORNSUN Science& Technology Ltd.

Part # B1212S-2W
Description  DUAL/SINGLE OUTPUT DC-DC CONVERTER
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Manufacturer  MORNSUN [MORNSUN Science& Technology Ltd.]
Direct Link  http://www.mornsun-power.com
Logo MORNSUN - MORNSUN Science& Technology Ltd.

B1212S-2W Datasheet(HTML) 5 Page - MORNSUN Science& Technology Ltd.

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The copyright and authority for the interpretation of the products are reserved by MORNSUN
A_S-2W & B_S-2W
B/1-2012
Page 5 of 5
TEST CONFIGURATIONS
Input Reflected-Ripple Current Test Setup
Input reflected-ripple current is measured with an inductor Lin and Capacitor Cin to simulate source impedance.
DC
Cin
Lin
DC
Load
Oscilloscope
Current
Probe
Lin(4.7
µH)
Cin(220
µF, ESR < 1.0Ω at 100 KHz)
DESIGN 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 (A_S-1W / B_LS-1W Series).
2) Overload Protection
Under normal operating conditions, the output circuit of these products has no protection against overload. The simplest method is add a circuit
breaker to the circuit.
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 3).
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
GND
+Vo
0V
DC
Cin
DC
Cout
C out
-Vo
Dual O utput
Single Output
Vin
GND
+Vo
0V
DC
Cin
DC
C out
(Figure 3)
EXTERNAL CAPACITOR TABLE (TABLE 1)
Vin
(VDC)
Cin
(
µF)
Single Vout
(VDC)
Cout
(
µF)
Dual
Vout
(VDC)
Cout
#
(
µF)
3.3/5
4.7
3.3/5
10
±5
4.7
12
2.2
9
4.7
±9
2.2
15
2.2
12
2.2
±12
1
24
1
15
1
±15
0.47
--
--
24
1
±24
0.47
Note:
# For each output. 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 4), the recommended capacitance of its filter capacitor sees
(Table 1), linear regulator based on the actual voltage and current to reasonable selection.
Vin
GND
0V
+Vo
DC
DC
-Vo
REG
REG
REG
Vin
GND
0V
+Vo
DC
DC
REG
REG
Dual Output
Single Output
(Figure 4)
5) Cannot use in parallel and hot swap
Note:
1. Operation under minimum load will not damage the converter; However, they may not meet all specification listed.
2. Max. Capacitive Load tested at input voltage range and full load.
3. All date in the datasheet are measured according to nominal input voltage, rated output load, TA=25
, humidity<75%, unless otherwise specified
.
4. In this datasheet, all the test methods of indications are based on our corporate standards.
5. The performance in the datasheet is just fit for the part number in the selection guide, and may be different from the customer-designed product,
you can get more details from MORNSUN FAE.
6. Contact us for your specific requirement.
7. Specifications subject to change 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: 86-20-38601850
Fax:86-20-38601272
Http://www.mornsun-power.com


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