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IXTA70N075T2 Datasheet(PDF) 11 Page - IXYS Corporation |
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IXTA70N075T2 Datasheet(HTML) 11 Page - IXYS Corporation |
11 / 11 page DC to DC Synchronous Converter Design Abdus Sattar, IXYS Corporation IXAN0068 11 The estimated efficiency, % 93 93 . 0 6 . 42 6 . 39 = = = η %, Estimated input current: If we assume only 93% efficiency, then the estimated input current can be obtained, Estimated input current, η • = Vin VoIo I in = A 5 . 3 93 . 0 12 12 3 . 3 = • • A Bootstrap Circuit Design: [3] Selecting bootstrap circuit components are done with consideration of the electrical rating and characteristics of the high-side MOSFET (Q1). The capacitance is defined by datasheet of IXS839 driver, BST total G BST V Q C Δ = ) ( (24) Where QG(total) is the total gate charge of high-side MOSFET (Q1), and VBST Δ is the allowable voltage droop in Q1. Assume this voltage droop equal to 0.1V. uF mV nC C BST 210 . 0 200 42 = = The bootstrap diode and capacitor voltage rating should be DD IN pacitor DiodeandCa Bootstrap V V V + > _ The average forward current is defined by, SW total G Avg F f Q I • = ) ( ) ( (25) mA 5 . 10 10 250 10 42 3 9 = • • • = − Bibliography [1] “Synchronous Buck MOSFETs loss calculation” AN-6005, Jon Klein, Fairchild Semiconductor, 01/04/2006, www.fairchildsemi.com [2] “Examination of reverse recovery losses in a synchronous buck converter circuit” Application Note from Silicon Semiconductor, 2003, www.siliconsemi.com [3] Datasheet for ISL6594D “Advanced Synchronous Rectified Buck MOSFET Driver” from Intersil Corporation, 2007, www.intersil.com |
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