TPS4810-Q1: TPS4810-Q1

Kate Fan

Part Number: TPS4810-Q1

Tool/software:

Hi,

I have two questions about TPS4810-Q1, please kindly help confirm:

1) If I set low-side current sense configuration(CS_SEL is pulled to high) for TPS4810-Q1, can it support bidirectional current detection(From CS+ to CS- or From CS- to CS+)?

2) I used the PSPICE model of TPS4810-Q1 to simulate, found V(BST-SRC) reached to 15V, is it OK? I think it should be between 9.3V~12.8V from the datasheet.

Thank you.

Kate

4 months ago

0 Rishika Patel 4 months ago

TI__Expert 7511 points

Hi Kate,

I am getting more information and will get back to you tomorrow.

Best Regards,

Rishika Patel

0 Rishika Patel 4 months ago in reply to Rishika Patel

TI__Expert 7511 points

Hi Kate,

1. I am confirming with the team in India to see if this is possible.

2. The device should regulate the voltage and the capacitor should discharge after it reaches 12.8V. However, it might reach higher voltages if the VAUX supply is used with a higher voltage. The absolute max is 19V. Are you using VAUX to charge the BST capacitor? Also, the PSPICE model is just a simulation, it may vary during actual application.

Best Regards,

Rishika Patel

0 Kate Fan 4 months ago in reply to Rishika Patel

Prodigy 10 points

Hi, Rishika

I don't use VAUX supply to charge the BST capacitor. Added the simulate result figure:

Thank you.

Best regards,

Kate

0 Rishika Patel 4 months ago in reply to Kate Fan

TI__Expert 7511 points

Hi Kate,

If you are not using a VAUX supply, the device should recognize that the BST-SRC voltage is at 12.8V, the upper limit for the charge pump turn off voltage range, and the capacitor should discharge. Again, this is just a simulation so, behavior and measurements can slightly differ than an actual application. We are still waiting for more information about your first question and I will update soon.

Best Regards,

Rishika Patel

0 Kate Fan 4 months ago in reply to Rishika Patel

Prodigy 10 points

Hi, Rishika

Thank you for your support. Looking forward to the reply of Q1.

Best regards,

Kate

0 Rishika Patel 4 months ago in reply to Kate Fan

TI__Expert 7511 points

Hi Kate,

For question 1 - you would only be able to choose one direction, either forward or reverse to monitor current in, but yes, current monitoring in the reverse direction with low-side sensing is possible.

Best Regards,

Rishika Patel

0 Kate Fan 4 months ago in reply to Rishika Patel

Prodigy 10 points

Hi, Rishika

Thank you for your information and support!

Best regards,

Kate

0 Rishika Patel 4 months ago in reply to Kate Fan

TI__Expert 7511 points

Hi Kate,

Also, for current monitoring in the reverse direction with low-side sensing, just flip the placement of CS+ and CS- across RSNS.

Best Regards,

Rishika Patel

0 Kate Fan 4 months ago in reply to Rishika Patel

Prodigy 10 points

Hi, Rishika

That is, once I have CS+ and CS- connected to shunt(see the below figure1), only can test the current(battery+ to battery-)?

If I want to test the reverse current(from battery- to battery+), need to flip the connections of CS+ and CS-( like the figure2)?

It's a bit confusing, thank you for your patience.

Figure1:

Figure 2:

Best regards,

Kate

0 Rishika Patel 4 months ago in reply to Kate Fan

TI__Expert 7511 points

Hi Kate,

Yes, you can only monitor current in one direction at a time depending on the way the CS+/- pins are configured. What you have is correct; figure one is for monitoring current in the forward direction and figure two is for monitoring current in the reverse direction.

Please let me know if you have more questions.

Best Regards,

Rishika Patel

0 Kate Fan 4 months ago in reply to Rishika Patel

Prodigy 10 points

Hi, Rishika

Thank you for your confirmation. It's clear now.

Best regards,

Kate

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TPS4810-Q1: TPS4810-Q1