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URF4812LP-20W Datasheet(PDF) 6 Page - MORNSUN Science& Technology Ltd. |
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URF4812LP-20W Datasheet(HTML) 6 Page - MORNSUN Science& Technology Ltd. |
6 / 6 page The copyright and authority for the interpretation of the products are reserved by MORNSUN 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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