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Technology Stocks : Wolf speed
WOLF 26.32+0.6%Oct 31 9:30 AM EST
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To: EvanG who wrote (10542)8/29/2022 1:44:53 PM
From: Lou Weed2 Recommendations

Recommended By
EvanG
slacker711

   of 10712
 
The lower the Rdson, the larger the die, the better the thermal resistance, the higher the current rating and most importantly - the higher the cost.

One of the big advantages of SiC is the much lower increase in Rdson over temp (25C to 175C) compared with Silicon devices. You can see that II-VI has the best performance over temp with respect to Rdson. An equivalent silicon MOSFET would see the Rdson increase 2.5x to 3x over the same range.

Any die <10mOhm will typically be used in power modules as they dissipate too much power for standard discrete packages.

Automotive customers are looking for the lowest possible Rdson ratings for their traction inverters. Traction inverters run at relatively low switching frequencies (~10kHz) due to motor limitations and higher power levels (100kW+). As a result, the higher capacitances of the larger die aren't a prohibiting factor - it's all about lower Rdson for the inverter section.

Now the on-board-chargers (OBC) switch at much higher frequencies (>100kHz) and run at lower power levels (up to 22kW). For these circuits, capacitance is the important parameter, not Rdson. At higher switching frequencies you want smaller die with smaller capacitance (higher Rdson).

Hope this helps.....
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