전자부품 데이터시트 검색엔진 |
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V72B28M250BN 데이터시트(PDF) 7 Page - Vicor Corporation |
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V72B28M250BN 데이터시트(HTML) 7 Page - Vicor Corporation |
7 / 11 page Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715 72V Mini Family Rev. 1.7 Page 7 of 11 Set your site on VICOR at vicorpower.com Output Voltage Programming The output voltage of the converter can be adjusted or programmed via fixed resistors, potentiometers or voltage DACs. See Figures 7 and 8. Figure 8 — Output voltage trim up circuit. Figure 7 — Output voltage trim down circuit. RD (ohms) = 1,000 Vout Vnom - Vout RU Trim Up Load +Out +S SC –S –Out Error Amp 1k Ω 1.23V 0.033 μF RD Trim Down Load +Out +S SC –S –Out Error Amp 1k Ω 1.23V 0.033 μF Trim Down 1. This converter is not a constant power device – it has a constant current limit. Hence, available output power is reduced by the same percentage that output voltage is trimmed down. Do not exceed maximum rated output current. 2. The trim down resistor must be connected to the –Sense pin. Trim Up 1. The converter is rated for a maximum delivered power. To ensure that maximum rated power is not exceeded, reduce maximum output current by the same percentage increase in output voltage. 2. The trim up resistor must be connected to the +Sense pin. 3. Do not trim the converter above maximum trim range (typically +10%) or the output over voltage protection circuitry may be activated. RU (ohms) = 1,000 (Vout-1.23) Vnom –1,000 1.23 (Vout-Vnom) CONTROL FUNCTIONS - SC PIN Trim resistor values calculated automatically: On-line calculators for trim resistor values are available on the vicor website at: vicorpower.com/tools. Resistor values can be calculated for fixed trim up, fixed trim down and for variable trim up or down. In addition to trimming information, the web site and the Applications Manual also include design tips, applications circuits, EMC suggestions, thermal design guidelines and PDF data sheets for all available Vicor products. |
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