IMD700A Rdson current sensing

Tip / Sign in to post questions, reply, level up, and achieve exciting badges. Know more

cross mob
SamiK
Level 1
Level 1
First reply posted First like received First question asked

Hi,

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

1 Solution
lock attach
Attachments are accessible only for community members.
SuhasBobade
Moderator
Moderator
Moderator
100 sign-ins 50 replies posted 25 solutions authored

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.

 

View solution in original post

0 Likes
1 Reply
lock attach
Attachments are accessible only for community members.
SuhasBobade
Moderator
Moderator
Moderator
100 sign-ins 50 replies posted 25 solutions authored

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.

 

0 Likes