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WM8351 Datasheet(PDF) 323 Page - Wolfson Microelectronics plc |
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WM8351 Datasheet(HTML) 323 Page - Wolfson Microelectronics plc |
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323 / 330 page  Production Data WM8351 w PD, April 2012, Rev 4.5 323 When selecting a suitable output inductor, the inductance value and the saturation current must be compatible with the operating conditions of the converter. The magnitude of the inductor current ripple is dependent on the inductor value and can be determined by the following equation: The inductor current is also a function of the DC-DC Converter maximum input current, which can be determined by the following equation: As a minimum requirement, the DC current rating should be equal to the maximum input current plus one half of the inductor current ripple. To be suitable for the application, the chosen inductor must have a saturation current that is higher than the peak inductor current given by the above equation. To maximise the converter efficiency, the inductor should also have a low DC Resistance (DCR), resulting in minimum conduction losses. Care should also be taken to ensure that the inductor is effective at the applicable operating temperature. See Section 29.4.4 for recommended inductor, capacitor and FET component details. |
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