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URF4812LP-20W Datasheet(PDF) 6 Page - MORNSUN Science& Technology Ltd.

Part # URF4812LP-20W
Description  REGULATED 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.

URF4812LP-20W Datasheet(HTML) 6 Page - MORNSUN Science& Technology Ltd.

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URF_LP-20W
2013.05.24-A/1
Page 6of 6
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)
TRIM APPLICATION & TRIM RESISTANCE
Application circuit for TRIM (Part in broken line is the interior of models)
0V
R2
R1
R3
Vref
RT
Trim
+Vo
0V
R2
R1
R3
Vref
RT
Trim
+Vo
Trim up
Trim down
Formula for resistance of TRIM
up:
a=
Vref
Vo
’-Vref
R1
R=
T
aR2
R -a
2
-R3
do wn :
a=
Vref
Vo
’-Vref
R2
R=
T
aR1
R -a
1
-R3
Note: Leave open if not used. Value for R1, R2, R3, and Vref refer to the above table 1. RT: Resistance of Trim. a: User-defined parameter, no actual
meanings. Vo
’: The trim up/down voltage.
(Table 1)
Vo
Parameter
5(VDC)
12(VDC)
15(VDC)
24 (VDC)
R1(K
Ω)
2.883
10.971
14.497
24.872
R2(K
Ω)
2.864
2.864
2.864
2.863
R3(K
Ω)
12.1
17.8
17.8
20
Vref(V)
2.5
2.5
2.5
2.5
DESIGN CONSIDERATIONS
1) Recommended circuit
All the URF_LP-20W Series have been tested according to the following recommended test circuit before leaving the factory (see Figure 4).
If you want to further decrease the input/output ripple, you can increase a capacitance-values properly or choose capacitors with low ESR, but
the total capacitance of the filter capacitor must not exceed the Max Capacitive Load. The recommended capacitance of its filter capacitor sees
Table 2.
DC
DC
Vin
GND
+Vo
0V
Cin
Cout
Single Output
(Figure 4)
(Table 2)
2) It is not recommended to increase the output power capability by connecting two or more converters in parallel.The product is not
hot-swappable
Output voltage
(VDC)
Cout(
μF) Cin(μF)
5
470
12/15
220
24
100
100
Note:
1. Min. load shouldn't be less than 5%, otherwise ripple maybe increased dramatically, If the product operates under min. load, it may not be
guaranteed to meet all specifications listed. Operation under minimum load will not damage the converter.
2. Max. Capacitive Load is tested at input voltage range and full load.
3. All specifications measured at Ta=25
°C, humidity<75%, nominal input voltage and rated output load unless otherwise specified.
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 details.
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: 86-20-38601850
Fax:86-20-38601272
E-mail: info@mornsun.cn
Http://www.mornsun-power.com


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