Project Analog - April 2008 - (Page 5) Calculating power Dissipation in a MOSFET Driver Contributed by Microchip Technology www.microchip.com introduction There are many MOSFET technologies and silicon processes in existence today, with new advances being made every day. As with any design decision, there are multiple variables involved when selecting the proper MOSFET driver for the MOSFET being used in your design. Parameters such as input-to-output propagation delay, quiescent current, latch-up immunity and driver current rating must all be taken into account. Power dissipation of the driver will also effect your packaging decision and driver selection. This article discusses the details of MOSFET driver power dissipation in relation to MOSFET gate charge and operating frequency. Power dissiPation in a MosFet driver Charging and discharging the gate of a MOSFET requires the same amount of energy, regardless of how fast or slow (rise and fall of gate voltage) it occurs. Therefore, the current drive capability of the MOSFET driver does not effect the power dissipation in the driver due to the capacitive load of the MOSFET gate. Contents Viewpoint Calculating Power Dissipation Accelerating Amplifier Design Driving Power MOSFETs Analog news Microchip analog page MOSFET driver overview Sample center microchipDIRECT Reference designs/ app notes Technical training 5 · prOjECT ANAlOg · Apr 08 http://www.microchip.com http://www.microchip.com http://www.microchip.com/analog http://www.microchip.com/analog http://www.microchip.com/mosfetdriver http://www.microchip.com/mosfetdriver http://sample.microchip.com/Default.aspx?testCookies=true http://www.microchipdirect.com/catalogselection.aspx?returnURL=default.aspx http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1469&filter1=function&redirects=appnotes http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1469&filter1=function&redirects=appnotes http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1423
Table of Contents Feed for the Digital Edition of Project Analog - April 2008 Project Analog - April 2008 Contents Viewpoint About Project Analog Sponsor Calculating Power Dissipation in a MOSFET Driver Accelerating Design of >50-W Class D Amplifiers Driving Power MOSFETs in Switch Mode Power Supplies Synergistic MOSFET Solutions Trends in MOSFET Gate Drivers Analog News—Analog news from multiple sources Enter to win an iPhone Contact Project Analog Sponsor Treelink Microchip Advanced Parts Selector (MAPS) Project Analog - April 2008 Project Analog - April 2008 - Project Analog - April 2008 (Page 1) Project Analog - April 2008 - Contents (Page 2) Project Analog - April 2008 - Viewpoint (Page 3) Project Analog - April 2008 - About Project Analog Sponsor (Page 4) Project Analog - April 2008 - Calculating Power Dissipation in a MOSFET Driver (Page 5) Project Analog - April 2008 - Calculating Power Dissipation in a MOSFET Driver (Page 6) Project Analog - April 2008 - Calculating Power Dissipation in a MOSFET Driver (Page 7) Project Analog - April 2008 - Calculating Power Dissipation in a MOSFET Driver (Page 8) Project Analog - April 2008 - Calculating Power Dissipation in a MOSFET Driver (Page 9) Project Analog - April 2008 - Accelerating Design of >50-W Class D Amplifiers (Page 10) Project Analog - April 2008 - Accelerating Design of >50-W Class D Amplifiers (Page 11) Project Analog - April 2008 - Accelerating Design of >50-W Class D Amplifiers (Page 12) Project Analog - April 2008 - Driving Power MOSFETs in Switch Mode Power Supplies (Page 13) Project Analog - April 2008 - Driving Power MOSFETs in Switch Mode Power Supplies (Page 14) Project Analog - April 2008 - Driving Power MOSFETs in Switch Mode Power Supplies (Page 15) Project Analog - April 2008 - Synergistic MOSFET Solutions (Page 16) Project Analog - April 2008 - Synergistic MOSFET Solutions (Page 17) Project Analog - April 2008 - Synergistic MOSFET Solutions (Page 18) Project Analog - April 2008 - Trends in MOSFET Gate Drivers (Page 19) Project Analog - April 2008 - Trends in MOSFET Gate Drivers (Page 20) Project Analog - April 2008 - Trends in MOSFET Gate Drivers (Page 21) Project Analog - April 2008 - Analog News—Analog news from multiple sources (Page 22) Project Analog - April 2008 - Contact Project Analog Sponsor (Page 23) Project Analog - April 2008 - Treelink (Page 24) Project Analog - April 2008 - Microchip Advanced Parts Selector (MAPS) (Page 25) Project Analog - April 2008 - Microchip Advanced Parts Selector (MAPS) (Page 26) Project Analog - April 2008 - Microchip Advanced Parts Selector (MAPS) (Page 27) Project Analog - April 2008 - Microchip Advanced Parts Selector (MAPS) (Page 28) Project Analog - April 2008 - Microchip Advanced Parts Selector (MAPS) (Page 29) Project Analog - April 2008 - Microchip Advanced Parts Selector (MAPS) (Page 30) Project Analog - April 2008 - Microchip Advanced Parts Selector (MAPS) (Page 31)
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