TPS63020-Q1: VFB spec

Isao Takigasaki

Part Number: TPS63020-Q1

Hi,

TPS63020-Q1's datasheet describes 2 kinds of VFB spec in P.5, one is at PS/SYNC = VIN and the another one is at PS/SYNC = GND.
Why are the specs defined separately? PLS tell me the reason to separate and the reason why the VFB spec at PS/SYNC = GND has wider range.

PLS also tell me the reason why the VFB at PS/SYNC defined with using percentage, -0.6% of 500mV for min and +5% of 500mV in max.

Best Regards, Taki

over 2 years ago

0 Jasper Li over 2 years ago

TI__Mastermind 46905 points

Hi Taki-san,

please refer to the page 11 to understand the operating principle of the PFM. such control method need higher VREF than PWM mode.

0 Isao Takigasaki over 2 years ago in reply to Jasper Li

TI__Intellectual 2500 points

Hi Jasper-san,
Thank you for your reply.

I understood.

Let me confirm.
The target of minimum threshold at VFB is +2.5% of VFB and maximum one is +3.5% in PFM Mode.
With adding margin, minimum of VFB is +0.6% and maximum one is +5%.
Is my understanding correct?

Best Regards, Taki

0 Jasper Li over 2 years ago in reply to Isao Takigasaki

TI__Mastermind 46905 points

Hi Isao-san,

yes. your understanding is correct.

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TPS63020-Q1: VFB spec