Power Supply Engineer's Guide to Calculate Dissipation for MOSFETs in High-Power Supplies

Focus:

To specify power MOSFETs for high-current, multiphase synchronous buck converters like those used to power CPU cores in notebook computers, designers must calculate the power dissipation of the MOSFETs and determine their maximum operating junction temperature. An iterative process is described for calculating power dissipation and maximum junction temperature of both the synchronous rectifier MOSFET and the switching MOSFET. Advice is given on how to modify MOSFET parameters and/or application requirements to achieve suitable MOSFET performance. Discussion includes tips on thermal management related to MOSFET package selection and use of pc bpoard copper for device heatsinking. A design example illustrates how these calculations are performed in an application.

What you’ll learn:

• How to select power MOSFETs for use in multiphase, synchronous buck converters
• How to calculate the power dissipation and junction temperature of power MOSFETs used in multiphase, synchronous buck converters

Notes:

Maxim Integrated Products Application Note 1832

View the Source

Author & Publication:

no author specified, Maxim Integrated Products, Vendor website, Dec 26 2002

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