INA138: Design review

Marvn Arcangel

Genius 14100 points

Part Number: INA138

Hi Team,

Good day. Can you help check the customer schematic below?

Vload is connected to dynamic load and tried 1A,2A,0.5A but there is no voltage on vout.

The Rsense has been changed to 20 mOHM and 100mOHM and r96 to 33k and 200k but still no voltage on vout.

Thank you kindly.

Regards,

Marvin

over 3 years ago

0 kai klaas69 over 3 years ago

Guru 140200 points

Hi Marvin,

Marvn Arcangel said:
Vload is connected to dynamic load and tried 1A,2A,0.5A but there is no voltage on vout.

What do you mean by "tried"? Is current flowing through the PMOS?

And what exactly means "no voltage on vout"? No voltage at the drain of PMOS or no voltage at the output of INA138?

Does it work with a static load instead of your dynamic load?

What does "dynamic load" exactly mean?

Kai

0 Javier Contreras4 over 3 years ago

TI__Mastermind 32870 points

Hello Marvin,

I agree with Kai with his questions, these answers will help with the debug. Is there anything loading the output. As this device is a current output you need to make sure there is no load at the output.

0 Marvn Arcangel over 3 years ago in reply to Javier Contreras4

TI__Genius 14100 points

Hi Kai and Javier,

I will get back to you once I receive a response form the customer.

Thanks for your support.

Regards,

Marvin

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INA138: Design review