TDA21472 Coss

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DavidL1970
Level 1
Level 1
First reply posted First question asked Welcome!

What is the Coss of the low-side MOSFET within the TDA21472?  I'd like to calculate the component values for an external snubber based on Infineon document KBA222118.

 

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1 Solution
AZIZ_HASSAN
Moderator
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50 likes received 5 likes given 250 sign-ins

Hi,

I would like to give some comments regarding the IC.

1) Since, you were told about typical value, the exact value of low side MOSFET output capacitance is 1800pf.

2) Since, this is IFX power stage product, we typically don't recommend a snubber circuit. This is  one of the reason why Coss value was not given in data sheet.

I hope this information will help you in your design.

 

BR,

AZIZ HASSAN

 

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4 Replies
AZIZ_HASSAN
Moderator
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50 likes received 5 likes given 250 sign-ins

Hi,

Thank you for posting on Infineon community.

Are you trying to calculate the parameters based upon this formula.

AZIZ_HASSAN_0-1643953918750.png

 

BR,

AZIZ HASSAN

 

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Yes, that is correct.

I have received an email response from a colleague of yours stating the Coss is 2.040 nF.

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AZIZ_HASSAN
Moderator
Moderator
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50 likes received 5 likes given 250 sign-ins

Hi,

Yes for these kind of optiMOS, the value  is OK.

BR,

AZIZ HASSAN

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AZIZ_HASSAN
Moderator
Moderator
Moderator
50 likes received 5 likes given 250 sign-ins

Hi,

I would like to give some comments regarding the IC.

1) Since, you were told about typical value, the exact value of low side MOSFET output capacitance is 1800pf.

2) Since, this is IFX power stage product, we typically don't recommend a snubber circuit. This is  one of the reason why Coss value was not given in data sheet.

I hope this information will help you in your design.

 

BR,

AZIZ HASSAN

 

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