04 a negligible value table 2 and table 3 show how a

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Unformatted text preview: 04% - a negligible value. Table: 2 and Table: 3 show how a full range of driver ICs with peak current ratings from 2 Amps to 30 Amps can be used for a full range of MOSFETs with VDS rating of 60 Volts to 1000 Volts and I rating of D 24 Amps to 340 Amps at different fsw =50 KHz, 100 KHz, 200 KHz, 400KHz and 800 KHz. Please note that * indicates that the driver IC (in TO-263 and/or TO-220 package) will need a heat sink. The availability of a 30 Amp driver IC opens doors to great many possibilities. It is very important to understand that when 30 Amps peak current is required to drive a MOSFET/IGBT, it is never prudent to parallel two 14 Amp driver ICs, as this tends to allow momentary shoot through current from P-Channel MOSFET (Totem pole output stage) of one driver into NChannel MOSFET (Totem pole output stage) of another driver due to mismatch in propagation delays between two drivers. Thus the importance of having a 30 Amps driver IC can’t be overemphasized. 1.3 ADVANCES IN MOSFETs AND IGBTs Extending the discussion further, we know that advances in Power MOSFET technology are giving dividends in the form of lower R DS(on) (that gives lower conduction losses), lower RGint (that improves switching speed), lower Qg (that improves dynamic performance and requires less power from driver), lower transient thermal impedance (enabling higher power dissipation) and lower C and lower gate to iss drain feedback capacitance C and lower rise and rss fall times (enabling operation at still higher switching frequency). Advances in IGBT technology centre around improving NPT technology by ‘soft punch through’ techniques, called the Third Generation NPT Technology. The dividends from such advances are multi-fold: lower cost, 20% lower on-state and 20% lower switching losses, better parallel current IXAN0009 sharing, lower thermal impedance, increased ruggedness to overloads, lower input capacitance and faster yet smother turn-on and turn-off waveforms. It looks like a true win-win situ...
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This note was uploaded on 01/15/2014 for the course ECE 624 taught by Professor Staff during the Winter '08 term at Ohio State.

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