URF2405LP-20W Datasheet, PDF (6/6 Pages) MORNSUN Science& Technology Ltd. – REGULATED SINGLE OUTPUT DC-DC CONVERTER

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.
O s c illos c ope
Lin
DC DC ^Current
Cin Probe
Load
Lin(4.7µH) Cin(220µF, ESR < 1.0Ω at 100 KHz)
TRIM APPLICATION & TRIM RESISTANCE
Application circuit for TRIM (Part in broken line is the interior of models)
+Vo
+Vo
R1
Vref ^R3
R2
RT
Trim
R1
Vref ^R3
R2
RT
Trim
Formula for resistance of TRIM
aR2
up: RT= _R2-a - R3
aR1
do wn : RT= _{R1- a} -R3
Vref
a= _{Vo’-Vref} R1
Vo ’ - Vr e f
a=
R2
Vr e f
0V
0V
Trim up
Trim down
Note: Leave open if not used. Value for R1, R2, R3, and V_ref refer to the above table 1. RT: Resistance of Trim. a: User-defined parameter, no actual
meanings. Vo’: The trim up/down voltage.
Vo
P aram et er
R1(KΩ)
R2(KΩ)
R3(KΩ)
(Table 1)
5(VDC)
12(VDC)
2.883
2.864
12.1
10.971
2.864
17.8
15(VDC)
14.497
2.864
17.8
24 (VDC)
24.872
2.863
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.
Single Output
Vi n
+Vo
Cin
DC DC Cout
GND
0V
Output voltage
（VDC）
5
12/15
24
Cout（μF）
470
220
100
Cin（μF）
100
(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
Not e:
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: [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
URF_LP-20W
2013.05.24-A/1
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