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PI2211
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Figure 11 - Start-up, Over-Current, and SOA shut-down waveforms.
The MOSFET is held off for 200us before attempting to re-
start. Again, the MOSFET will be regulated to the start-up
current level, but now turns off due to an SOA shut-down.
The True- SOA? protection has determined that the junction
temperature of the MOSFET has risen by 60°C and has shut it
down to cool. When the SOA monitoring has determined that
the junction temperature has dropped by 39°C the MOSFET
will again turn on. The 39°C thermal cycling range will
continue for a total of 16 pulses before the range is extended
to 57°C, where the thermal cycling will go on indefinitely until
the low impedance load is removed.
Picor Corporation · picorpower.com
PI2211
Rev 1.0, Page 14 of 26
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