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URF4803LP-20WR3 Datasheet(PDF) 4 Page - MORNSUN Science& Technology Ltd. |
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URF4803LP-20WR3 Datasheet(HTML) 4 Page - MORNSUN Science& Technology Ltd. |
4 / 6 page DC/DC Converter URF_LP-20WR3 Series 2014.07.22-A/0 Page 4 of 6 MORNSUN Guangzhou Science & Technology Co., Ltd. reserves the copyright and right of final interpretation 2. EMC solution-recommended circuit LDM1 ② C0 MOV FUSE ① C1 V in GND + Vin GND +Vo 0V DC/DC CY1 CY2 C2 LOAD Fig. 3 Notes: Part ① in the Fig. 3 is used for EMS test and part ② for EMI filtering; selected based on needs. Parameter description Model Vin:24V Vin:48V FUSE Choose according to actual input current MOV S14K35 S14K60 C0 330μF/50V 330μF/100V C1 1μF/50V 1μF/100V C2 Refer to the Cout in Fig.2 LDM1 4.7μH CY1 1nF/3KV CY2 1nF/3KV EMC solution-recommended circuit PCB layout Fig. 4 Note: the min. distance of the bonding pads between input & output isolation capacitors (CY1/CY2) shall be ≥ 2mm. 3. Application of Trim and calculation of Trim resistance 0V R2 R1 R3 Vref RT Trim +Vot 0V R2 R1 R3 Vref RT Trim +Vot Trim up Trim down Applied circuits of Trim (Part in broken line is the interior of models) Calculation formula of Trim resistance: up: a= Vref Vo’-Vref R1 R= T aR2 R-a 2 -R3 down: a= Vref Vo’-Vref R2 R= T aR1 R-a 1 -R3 RT is Trim resistance a is a self-defined parameter, with no real meaning. Vout(V) R1(KΩ)R2(KΩ)R3(KΩ)Vref(V) 3.3 4.801 2.87 12.4 1.25 5 2.883 2.87 10 2.5 9 7.500 2.87 15 2.5 12 11.000 2.87 15 2.5 15 14.494 2.87 15 2.5 24 24.872 2.87 17.8 2.5 |
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