TPS542951 input different voltage to Vin1 and Vin2

tateo yamashiro

Guru 10890 points

Other Parts Discussed in Thread: TPS542951

My customer has question about TPS542951.
Could you tell me about question.

[Question]
Can TPS542951 be used to input different voltage to Vin1 and Vin2?
ex. Vin1=13V and Vin2=5V

Best regards,

tateo

over 9 years ago

0 JohnTucker over 9 years ago

TI__Guru**** 191445 points

I have not tried it. But the EVM is set up so that splitting VIN is possible, so I am fairly certain that different VINs are supported. The BOOT voltage is referenced from VREG5 which is generated from VIN1, so I would definitely use the higher input voltage on VIN1.

0 tateo yamashiro over 9 years ago in reply to JohnTucker

Guru 10890 points

Thank you for your reply.

My customer is worried about reliability of IC.
Could you check to be sure that internal circit of IC?

Best regards,

tateo

0 JohnTucker over 9 years ago in reply to tateo yamashiro

TI__Guru**** 191445 points

I'll see if I have a board to try. It may be a few days.

0 tateo yamashiro over 9 years ago in reply to JohnTucker

Guru 10890 points

Thank you for your reply.

Please let me know if you see EVM.

And one more question.
You teached me VIN1 is higher than VIN2.
Why is VIN1 higher than VIN2?
Could you tell me in more detail.

Best regards,

tateo

0 JohnTucker over 9 years ago in reply to tateo yamashiro

TI__Guru**** 191445 points

I checked this. Is does in fact work with different voltages for VIN1 and VIN2. You do not necessarily have to have VIN1 higher than VIN2. Just make sure that VIN1 is high enough to allow VREG5 to properly regulate.

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TPS542951 input different voltage to Vin1 and Vin2