TPS65131: VFBP/N and Output voltage accuracy

Hirokazu Takahashi

Part Number: TPS65131

Dear support teams,

Q1. Is TPS6513x EVM available now?
Q2. What are VFBP and VFBN? Why are they defined?
Q3. Does output voltage accuracy have any relationship with VFBP and VFBN? If it does, could you let me know the relationship for Total Output DC accuracy, VFBP and VFBN?

Best Regards,
Hirokazu

over 4 years ago

0 Liaqat Khan over 4 years ago

TI__Mastermind 18550 points

Hello,

Thank you for your post. We will review it and get back to you by 11/5/19.

Kind Regards,

Liaqat

0 Liaqat Khan over 4 years ago

TI__Mastermind 18550 points

Hello Hirokazu-san,

There is an EVM available for TPS65131 and you can order it on ti.com as TPS65131EVM-839

VFBP and VFBN are feedback voltage ranges for the boost and inverting buck boost converters respectively and the internal control loop strives to maintain these voltages in the ranges specified in the datasheet. DC accuracy of the output voltages for boost and inverting converter will be scaled version of this VFBP and VFBN accuracy. For example VFBP range specified in the datasheet is approx. +/-2% from nominal value of 1.213V so the DC accuracy of the boost output voltage will be +/-2%.

Kind Regards,

Liaqat

0 Hirokazu Takahashi over 4 years ago in reply to Liaqat Khan

TI__Expert 8420 points

Hello Liaqat-san

Thanks for your detail explanation.

Total Output DC accuracy is defined as typ +/-3%. What means "total"?
According to Equation 1 and 2, the accuracy of VPOS and VNEG depends on VREF accuracy. How does VFBP/N related with DC output accurasy?

Best Regards,
Hirokazu Takahashi

0 Liaqat Khan over 4 years ago in reply to Hirokazu Takahashi

TI__Mastermind 18550 points

Hello Takahashi-san,

Thanks for your reply. I am tied up with some urgent tasks but will look into your questions in more detail and get back to you in next couple of days.

Kind Regards,

Liaqat

0 Hirokazu Takahashi over 4 years ago in reply to Liaqat Khan

TI__Expert 8420 points

Hello Liaqat-san

Thanks for your reply.
I built spreadsheet for calculation of POS/NEG including accuracy.
Is my understand in the attached file correct?
Would you mind checking it?

TPS6513x Vout Cal (2019 11 06).xlsx

Best Regards,
Hirokazu Takahashi

0 Liaqat Khan over 4 years ago in reply to Hirokazu Takahashi

TI__Mastermind 18550 points

Hello Takahashi-san,

I will check the spreadsheet and get back to you through internal e-mail. I will close this thread.

Kind Regards,

Liaqat

0 Hirokazu Takahashi over 4 years ago in reply to Liaqat Khan

TI__Expert 8420 points

Hello Liaqat-san

Thanks for your reply.

OK. I'll wait for your feedback by e-mail.

Best Regards,

Hirokazu Takahashi

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TPS65131: VFBP/N and Output voltage accuracy