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Gate Driver ICs Forum Discussions

SamiK
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Level 1

Hi,

Can you help me to understand how Rdson current sensing works in IMD700A? 
Thanks in advance.

1 Solution
SuhasBobade
Moderator
Moderator 50 sign-ins 25 replies posted 10 solutions authored
Moderator

Hi 

Thanks for posting!

In Rdson current sensing, the ON resistance of the MOSFETs is used as a shunt resistor, and drop across drain and source terminal is measured and fed to current sense amplifier.

In this, the drain of the low side MOSFET to is connected to the positive input of the current sense amplifier. The negative input is connected to the source of the low side MOSFET. Kindly refer attached image. This is how Rdson current sensing works in IMD700A.

Kindly feel free to post your queries.

 

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SuhasBobade
Moderator
Moderator 50 sign-ins 25 replies posted 10 solutions authored
Moderator

Hi 

Thanks for posting!

In Rdson current sensing, the ON resistance of the MOSFETs is used as a shunt resistor, and drop across drain and source terminal is measured and fed to current sense amplifier.

In this, the drain of the low side MOSFET to is connected to the positive input of the current sense amplifier. The negative input is connected to the source of the low side MOSFET. Kindly refer attached image. This is how Rdson current sensing works in IMD700A.

Kindly feel free to post your queries.

 

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