TPS61253A: What's auto PFM threshold?

user4979989

Intellectual 2800 points

Part Number: TPS61253A

Hi team,

What's the value of auto PFM threshold?

Datasheet shows the term but I can't find the value.

Thank you.

Regards,

Allen

over 5 years ago

0 Zack Liu over 5 years ago

TI__Mastermind 34201 points

Hi Allen,

The auto PFM threshold is 0.4V. You can find the value on page 14.

0 user4979989 over 5 years ago in reply to Zack Liu

TI__Intellectual 2800 points

Hi Zack,

Thanks for the feedback but I'm asking the valley current threshold to exist auto PFM since this is not shown in datasheet.

0.4V should be the Mode pin logic to select PFM/PWM/ultrasonic operation?

Thanks.

Regards,

Allen

0 Zack Liu over 5 years ago in reply to user4979989

TI__Mastermind 34201 points

Hi Allen,

The typical value is 95mA. Why do you need this value?

0 user4979989 over 5 years ago in reply to Zack Liu

TI__Intellectual 2800 points

Hi Zack,

The question is raised by customers, they want to know when will the device exit auto PFM.
That's why I ask the current threshold.

Does 95mA mean once inductor valley current higher than 95mA, the device will exit auto PFM?

Thank you.

Regards,
Allen

0 Zack Liu over 5 years ago in reply to user4979989

TI__Mastermind 34201 points

Hi Allen,

The 95mA is a typical value. The variation of this valley current threshold is quite big and it could varies from 0 to 200mA.
Yes, once inductor valley current higher than this threshold, it exit auto PFM.

Power management

Power management forum

TPS61253A: What's auto PFM threshold?