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Intelligent Power Modules (IPM) Forum Discussions

User17675
Level 1
Level 1
5 questions asked First question asked First reply posted
What is purpose of bootstrap capacitor and how do I size it?
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1 Solution
Guru_Prasad
Moderator
Moderator
Moderator
25 likes received 250 sign-ins 50 solutions authored

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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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
25 likes received 250 sign-ins 50 solutions authored

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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