purpose of bootstrap capacitor?

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User17675
Level 1
Level 1
First like received 5 questions asked First question asked
What is purpose of bootstrap capacitor and how do I size it?
1 Solution
Guru_Prasad
Moderator
Moderator
Moderator
250 replies posted 100 solutions authored 25 likes received

Hello @User17675 

Thanks for writing to Infineon community.

The Bootstrap capacitor is used to provide the isolation supply for the high switch.

The bootstrap capacitor can size based on the Switch gate capacitance and switching frequency. The relation between the bootstrap capacitor ,switch gate charge and frequency amylases in this link.

Thanks

Vaddemani

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2 Replies
Casey
Employee
Employee
50 replies posted 25 replies posted 10 replies posted
Wen wrote:
What is purpose of bootstrap capacitor and how do I size it?


The bootstrap capacitor is required to supply voltage to the highside gate driver within the module. The internal bootstrap circuitry eliminates the need for any external high voltage diodes and resistors. To size the bootstrap capacitor, please check out the IPM's application note which is available on the IPM webpage
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Guru_Prasad
Moderator
Moderator
Moderator
250 replies posted 100 solutions authored 25 likes received

Hello @User17675 

Thanks for writing to Infineon community.

The Bootstrap capacitor is used to provide the isolation supply for the high switch.

The bootstrap capacitor can size based on the Switch gate capacitance and switching frequency. The relation between the bootstrap capacitor ,switch gate charge and frequency amylases in this link.

Thanks

Vaddemani

0 Likes