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EN1TS1.2.3 Datasheet(PDF) 9 Page - Vicor Corporation |
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EN1TS1.2.3 Datasheet(HTML) 9 Page - Vicor Corporation |
9 / 13 page Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715 ENMods System: FARM3 and MiniHAM Rev. 2.9 Page 9 of 13 Set your site on VICOR at vicorpower.com Operating Power (W) 0 5 10 15 20 25 30 35 40 500 250 * 2,200 μF 1,600 μF 1,300 μF * 1,100 μF 820 μF 680 μF Figure 13 — Power fail warning time vs. operating power and total bus capacitance, series combination of C1, C2 (see Figure 1a) Operating Power (W) 0 10 20 30 40 50 60 70 80 90 100 90 Vac 115 Vac 500 250 APPLICATION NOTE (CONT.) N EMI GND SR L + BOK ST EN – Micro- controller 15 Vdc 27 k Ω +5 Vdc Secondary referenced FARM3 Figure 12 — Bus OK (BOK) isolated power status indicator +In PC (Gate In) PR (Gate Out) –In N EMI GND SR L + B OK ST EN – 150 k 15 Vdc Vicor DC-DC Converter Micro- controller FARM3 250 Ω Figure 11 — Enable (EN) function Figure 14 — Ride-through time vs. operating power 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 Figure 15). 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 = PΔt = C(V 1 2–V 2 2) / 2 (2) Where: P = operating power Δt = discharge interval V1 = capacitor voltage at the beginning of Δt V2 = capacitor voltage at the end of Δt Rearranging Equation 2 to solve for the required capacitance: C = 2P Δt / (V 1 2–V 2 2)(3) |
Similar Part No. - EN1TS1.2.3 |
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