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V24B5C100A Datasheet(PDF) 5 Page - Vicor Corporation |
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V24B5C100A Datasheet(HTML) 5 Page - Vicor Corporation |
5 / 8 page Output Voltage Programming The output voltage of the converter can be adjusted or programmed via fixed resistors, potentiometers or voltage DACs. See Figures 7 & 8. Vicor Corporation Tel: 800-735-6200 Fax: 978-475-6715 Data Sheet: V24C28C100A DC-DC Converter Date: 11-00 Rev. 2 Page 5 of 8 CONTROL FUNCTIONS - SC PIN Figure 8—Output voltage trim up circuit. Figure 7—Output voltage trim down circuit. RU (ohms) = 1,000 (Vout-1.23) Vnom - 1,000 1.23 (Vout-Vnom) RD (ohms) = 1,000 Vout Vnom - Vout RU Trim Up Load Error Amp 1k Ω 1.23V 0.033 µF +Out SC –Out Load RD Trim Down Error Amp 1k Ω 1.23V 0.033 µF +Out SC –Out 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 –Out 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 +Out pin. 3. Do not trim the converter above maximum trim range (typically +10%) or the output over voltage protection circuitry may be activated. Trim values calculated automatically: Resistor trim calculators are available on Vicor’s web site at URL: www.vicr.com/tools.html or by requesting a copy of Vicor’s Applications Manual on a CD ROM. Resistor values can be calculated for fixed trim up, fixed trim down and for variable trim up or down cases for both 1st and 2nd Generation DC-DC converters. In addition to trimming information, the web site and the applications manual on CD ROM also include design tips, applications circuits, EMC suggestions, thermal design guidelines and PDF data sheets for all available Vicor products. Set your site on VICOR at www.vicr.com |
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