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User22438
Level 1
Level 1
First question asked First reply posted
Hi

I was wondering if the what operating factors may affect the Qrr and Trr of Power MOSFET
5312.attach
Does higher VDS or IDS increase the Qrr and Trr?

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

The reverse recovery charges Qrr and the recovery time trr, are intrinsic parameters of the diode during its turn-off phase. This parameter is used to distinguish the body diode of the MOSFETs. Lower the Qrr and trr, lower the time taken for the MOSFET to completely turn OFF.

The current and voltage waveforms during turn OFF phase is as shown below,

5315.attach


They depend on the following parameters,

1) IF: Forward current flowing through the diode before it turns off
2) dI/dt : Slope applied to the diode and imposed by the circuit
3) Tj: Operating junction temperature of the diode
4) VR: Reverse voltage applied across the diode.


Regards,
Abhilash P

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3 Replies
Abhilash_P
Moderator
Moderator
Moderator
50 likes received 500 replies posted 250 solutions authored
Hi,

The reverse recovery charges Qrr and the recovery time trr, are intrinsic parameters of the diode during its turn-off phase. This parameter is used to distinguish the body diode of the MOSFETs. Lower the Qrr and trr, lower the time taken for the MOSFET to completely turn OFF.

The current and voltage waveforms during turn OFF phase is as shown below,

5315.attach


They depend on the following parameters,

1) IF: Forward current flowing through the diode before it turns off
2) dI/dt : Slope applied to the diode and imposed by the circuit
3) Tj: Operating junction temperature of the diode
4) VR: Reverse voltage applied across the diode.


Regards,
Abhilash P
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User22438
Level 1
Level 1
First question asked First reply posted
Hi

Thanks for the help

So it can be concluded that higher VDS or IDS does not increase my Trr and Qrr right?

Thanks
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Abhilash_P
Moderator
Moderator
Moderator
50 likes received 500 replies posted 250 solutions authored
Hi,

It does depend on IDS.

Regards,
Abhilash P
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