STP200NF04 - STB200NF04 - STB200NF04-1
Figure 17: Allowable lav vs. Time in Avalanche
The previous curve gives the safe operating area for unclamped inductive loads, single pulse or repetitive,
under the following conditions:
PD(AVE) = 0.5 * (1.3 * BVDSS * IAV)
EAS(AR) = PD(AVE) * tAV
Where:
IAV is the Allowable Current in Avalanche
PD(AVE) is the Average Power Dissipation in Avalanche (Single Pulse)
tAV is the Time in Avalanche
To derate above 25 °C, at fixed IAV, the following equation must be applied:
Where:
IAV = 2 * (Tjmax - TCASE) / (1.3 * BVDSS * Zth)
Zth = K * Rth is the value coming from Normalized Thermal Response at fixed pulse width equal to TAV.
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