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Extrapolating MSOA.

Has anyone investigated how accurate linear extrapolations are from the maximum safe operating area graphs found in most datasheets? I have a few power mosfets that I would like to run at currents far below what is displayed in the MSOA. As you know the cutoff lines are generally piecewise linear. I would be interested in knowing how accurate it would be to extend these lines.

In my case the minimum current shown is 1A and the DC line ends at 40V with about a 45 degree slope. Extrapolating one might expect that at 0.1A the maximum DC voltage would be about 100V.

Knowing BV_DSS(and its I_D) we should be able to reconstruct the graph rather accurately?

Reply to
DonMack
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The low current SOA limit is Vceo(Vcex) or Vdsmax in bipolar or mos devices, independant of current. SOA curves seldom neglect to include this limit and it's junction with DC and transient limitation curves.

Also, be advised that the SOA line doesn't extend linearly into the next quadrant....

RL

Reply to
legg

Best is to point to the actual datasheet (link) and then tell us volts, amps and, most of all, the time duration and duty cycle you want.

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Regards, Joerg

http://www.analogconsultants.com/
Reply to
Joerg

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