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FARM1CN1 Datasheet(PDF) 7 Page - Vicor Corporation |
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FARM1CN1 Datasheet(HTML) 7 Page - Vicor Corporation |
7 / 12 page Set your site on VICOR at www.vicorpower.com PRELIMINARY Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715 FARM, Filter/Autoranging Rectifier Module Rev. 4.7 Page 7 of 12 Bus-OK (BOK) Pin. (see Fig. 11) The Bus-OK pin is intended to provide early-warning power fail information and is also referenced to the negative output pin. Caution: There is no input to output isolation in the FARM. It is necessary to monitor Bus-OK via an optoisolator if it is to be used on the secondary (output) side of the converters. A line isolation transformation should be used when performing scope measurements. Scope probes should never be applied simultaneously to the input and output as this will destroy the unit. Filter. (see Fig. 12) An integral input filter consists of a common mode choke and Y rated capacitors (line-ground) plus two X rated capacitors (line-line). This filter configuration provides common mode and differential mode insertion loss in the frequency range between 100kHz and 30MHz as illustrated in Figure 6. Hold-up Capacitors. Hold-up capacitor values should be determined according to output bus voltage ripple, power fail hold-up time, and ride-through time (see Fig. 13). Many applications require the power supply to maintain output regulation during a momentary power failure of specified duration, i.e., the converters must hold-up or ride through such an event while maintaining undisturbed output voltage regulation. Similarly, many of these same systems require notification of an impending power failure in order to allow time to perform an orderly shutdown. The energy stored on a capacitor which has been charged to voltage V is: ε = 1/2(CV2) (1) Where: ε = stored energy C = capacitance V = voltage across the capacitor Energy is given up by the capacitors as they are discharged by the converters. The energy expended (the power-time product) is: ε = P∆t = C(V 1 2–V 2 2) / 2 (2) Where: P = operating power ∆t = discharge interval V1 = capacitor voltage at the beginning of ∆t V2 = capacitor voltage at the end of ∆t Rearranging Equation 2 to solve for the required capacitance: C = 2P ∆t / (V1 2–V 2 2) (3) Application Note (continued) +In PC (Gate In) PR (Gate Out) –In N EMI GND N/C L + B OK ST EN – 150k 15Vdc Vicor DC-DC Converter Micro- controller Figure 10—Enable (EN) function +In PC (Gate In) PR (Gate Out) –In N EMI GND N/C L + B OK ST EN – Vicor DC-DC Converter Micro- controller 15 Vdc 27kΩ +5 Vdc Secondary referenced Optocoupler DI pkg. 26106 Optocoupler SM pkg. 26109 Figure 11—Bus OK (BOK) isolated power status indicator 4.7nF L1 4.7nF N EMI GND N/C L + B OK ST EN – .47µF .099µF 330µH Figure 12—Internal filter |
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