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AN805
Vishay Siliconix
PWM Optimized Power MOSFETs for Low-Voltage DC/DC Conversion
Designers of low-voltage dc-to-dc converters have two main concerns: reducing size and reducing losses. As a way of reducing size, designers are increasing switching frequencies. But the result has been reduced converter efficiency. To minimize losses, MOSFET manufacturers have generally focused on lowering on-resistance. But the results have not been optimal for dc-to-dc conversion designs, since gate charge and switching speed issues have been largely ignored. The dominant losses associated with MOSFETs were once conduction losses, but this is no longer the case.
AN805 Datasheet
