MOSFET Single pulse current

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User13734
Level 1
Level 1
First reply posted First like received 5 questions asked

Dear Sir or Madam,

We would like to use MOSFET IPB65R095C7 in an active bridge circuit (this is not bridgeless PFC). We simulated this circuit and found, that during surge test, current through MOSFET jumps up to 165A that is much higher than this MOSFET current pulse limit. But this is only single pulse (less than 100us) and simulation shows that MOSFET’s junction temperature will rise by 10°C (junction temperature before surge is 100°C). Is it possible to use this MOSFET at such condition without loose of reliability? Thanks.PFC_Critical_Conduction_Mode2_Simetrix_265Vac_with MOSFET_and_GateDrive1_CorrectEMC_Surge_with dis_ActiveBridge_Surge-graph.png

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1 Solution
Abhilash_P
Moderator
Moderator
Moderator
50 likes received 500 replies posted 250 solutions authored

Hi,

   Thank you for posting on the Infineon community.

For analyzing the surge current handling capability, you will have to refer to SOA. If the surge goes through the body diode and turns it on, the dIf/dt should also be checked. As switch is considered to be on the the time of surge, we can assume that the switch is hot, therefore you can use 80C SOA. You can not pass Ipeak > ID pulse in to CoolMOS. So, only operation within SOA is guaranteed. Also note that SOA is given for single pulse of mentioned duration. ID is physically limited by other factors like wire bond current limitation etc.

 

Regards,
Abhilash P

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1 Reply
Abhilash_P
Moderator
Moderator
Moderator
50 likes received 500 replies posted 250 solutions authored

Hi,

   Thank you for posting on the Infineon community.

For analyzing the surge current handling capability, you will have to refer to SOA. If the surge goes through the body diode and turns it on, the dIf/dt should also be checked. As switch is considered to be on the the time of surge, we can assume that the switch is hot, therefore you can use 80C SOA. You can not pass Ipeak > ID pulse in to CoolMOS. So, only operation within SOA is guaranteed. Also note that SOA is given for single pulse of mentioned duration. ID is physically limited by other factors like wire bond current limitation etc.

 

Regards,
Abhilash P