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FARM2C13 Datasheet(PDF) 7 Page - Vicor Corporation |
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FARM2C13 Datasheet(HTML) 7 Page - Vicor Corporation |
7 / 11 page FARM™ Rev 6.7 vicorpower.com Page 7 of 11 06/2015 800 927.9474 FARMxxxx +IN PC (GATE IN) PR –IN N EMI GND N/C L + EN – 150 k 15 Vdc Micro- controller Vicor DC-DC Converter FARM BOK ST Not used with VI-260/VI-J60 Figure 10 — Enable (EN) function 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 transformer should be used when performing scope measurements. Scope probes should never be applied simultaneously to the input and output as this will damage the module. 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 100 kHz and 30 MHz 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 shut down. 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 / (V1 2–V 2 2)(3) APPLICATION NOTE (CONT.) +IN PC PR –IN N EMI GND N/C L + BOK ST EN – Vicor DC-DC Converter Micro- controller 15 Vdc +5 Vdc Secondary referenced Figure 11 — Bus OK (BOK) isolated power status indicator 4.7 nF L1 4.7 nF N EMI GND N/C L 0.47 μF 0.099 μF 330 μH + BOK ST EN – CM Figure 12 — Internal filter |
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