Power management

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TPS631000: Switching the MODE terminal

Dice-K

Mastermind 7102 points

Part Number: TPS631000
Other Parts Discussed in Thread: TPS63060, TPSM83100

Tool/software:

Hi support team,

Is it okay to change the logic of the MODE terminal to switch between PFM/PWM while power is being input to the VIN terminal, the EN terminal is high, and output is being generated from the VOUT terminal?
(Will the output be interrupted?)
Or is it better to fix the MODE while output is in progress?

Regards,
Dice-K

0 Tao Zhang 9 months ago

TI__Mastermind 29560 points

Hi Dice-k,

It is ok, no worries.

Regards

Tao

0 Dice-K 9 months ago in reply to Tao Zhang

Mastermind 7102 points

Hi Tao,
Thank you for your reply.

I found information in the following thread that says it takes 2μs to transition from PFM to PWM.
e2e.ti.com/.../tps631000-switching-from-pfm-to-pwm

Is the transition time from PWM to PFM about the same?

Best regards,
Dice-K

0 Tao Zhang 9 months ago in reply to Dice-K

TI__Mastermind 29560 points

Hi Dice,

Yes, it is close.

Regards

Tao

0 Dice-K 9 months ago in reply to Tao Zhang

Mastermind 7102 points

Hi Tao,
Thank you for your reply.

Also, is the output voltage seamless?

Also, doesn't the output voltage fluctuate when switching modes like with the TPS63060?

Best regards,

Dice-K

+1 Tao Zhang 9 months ago in reply to Dice-K

TI__Mastermind 29560 points

Hi Dice,

It is very different with TPS63060 since their control therory is different.

For TPSM83100, there is almost no DC vout gap between PFM and PWM.

Regards

Tao