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LM51031 Datasheet(PDF) 9 Page - HTC Korea TAEJIN Technology Co. |
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LM51031 Datasheet(HTML) 9 Page - HTC Korea TAEJIN Technology Co. |
9 / 9 page Fast PFET Buck Controller LM51031 A P−Ch FET with a continuous drain current (ID) rating greater than the maximum output current is required. The Gate−to−Source voltage VGS and Source Breakdown Voltage should be chosen based on the input supply voltage. The power dissipation due to the conduction losses is given by: where The power dissipation of the P−Ch FET due to the switching losses is given by: where tr = Rise Time. 11) Diode Selection The flyback or catch diode should be a Schottky diode because of it’s fast switching ability and low forward voltage drop. The current rating must be at least equal to the maximum output current. The breakdown voltage should be at least 20 V for this 12 V application. The diode power dissipation is given by: HTC − 9 − |
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