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AN4209 Fiches technique(PDF) 10 Page - STMicroelectronics

No de pièce AN4209
Description  Design methodology for repetitive voltage suppressors
PDF  19 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4209 Fiches technique(HTML) 10 Page - STMicroelectronics

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STRVS parameters
AN4209
10/19
DocID023949 Rev 2
When tSW is not negligible regarding the thermal of the device (Figure 7), average
temperature verification is not enough to ensure that the junction temperature of the die
remains within specifications. Consequently, the instantaneous peak junction temperature
Tjpeak must be verified using Equation 10
Figure 7. Switching frequency effect on the junction temperature variation in
repetitive mode.
t
Tjpeak
Tjavg
P(t)
Tj(t)
tp
tSW
Ppeak
PD
t
ΔTj
tp = pulse width
tSW = switching period
Tjmax
t
Tjavg
tp
PD
t
Tjmax
tSW
Ppeak
PStep
Tjpeak
Tj(t)
P(t)
Δ?Tj
tsw
<< τthermal
t sw >>
τthermal
PStep



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