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AFL27028SZ-ES Datasheet(PDF) 9 Page - International Rectifier |
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AFL27028SZ-ES Datasheet(HTML) 9 Page - International Rectifier |
9 / 11 page www.irf.com 9 AFL50XXS Series General Application Information Table 1. Nominal Resistance of Cu Wire The AFL50XXS series of converters are capable of pro- viding large transient currents to user loads on demand. Because the nominal input voltage range in this series is relatively low, the resulting input current demands will be correspondingly large. It is important therefore, that the line impedance be kept very low to prevent steady state and transient input currents from degrading the supply voltage between the voltage source and the converter input. In applications requiring high static currents and large tran- sients, it is recommended that the input leads be made of adequate size to minimize resistive losses, and that a good quality capacitor of approximately100 µfd be connected di- rectly across the input terminals to assure an adequately low impedance at the input terminals. Table I relates nomi- nal resistance values and selected wire sizes. Wire Size, AWG Resistance per ft 24 Ga 25.7 m Ω 22 Ga 16.2 m Ω 20 Ga 10.1 m Ω 18 Ga 6.4 m Ω 16 Ga 4.0 m Ω 14 Ga 2.5 m Ω 12 Ga 1.6 m Ω Incorporation of a 100 µfd capacitor at the input terminals is recommended as compensation for the dynamic ef- fects of the parasitic resistance of the input cable reacting with the complex impedance of the converter input, and to provide an energy reservoir for transient input current requirements. Figure VI. Problems of Parasitic Resistance in input Leads Vin Rtn Case Enable 1 Sync Out Sync In R p R p I Rtn I in e source System Ground e Rtn 100 µfd (See text) |
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