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AN2344 Datasheet(PDF) 9 Page - STMicroelectronics

Part # AN2344
Description  Power MOSFET avalanche characteristics and ratings
PDF  27 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2344 Datasheet(HTML) 9 Page - STMicroelectronics

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AN2344
Testing avalanche ruggedness
9/27
Legend:
VDS Device breakdown voltage constant during avalanche
IO Peak current during avalanche
L Inductance
R Coil series resistance
VDD Circuit supply voltage
ΨThe ratio of the inductor plus the resistor voltage to the resistor voltage drop: (VDS–
VDD)/(R•IO)
Table 1.
UIS circuit equations
Circuit condition
during
avalanche
tav(s)
Time in avalanche
Avalanche energy (J)
Avalanche power (W)
RVDD
0VDD
L IO/(VDS-VDD)
0.5 L IO
2 V
DS/(VDS – VDD)
0.5 IO VDS
00
L IO/VDS
0.5 L IO
2
0.5 IO VDS
RVDD
(L/R)In[1/In(1+1/
Ψ)-Ψ](L IO VDS/R)[1-ΨIn(1+1/Ψ)]
IO VDS [1/In(1+1/Ψ)-Ψ]



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