TPS61176: Output missing.

Kengo.Y

Part Number: TPS61176

Hi team,

In mode4, if a 120Hz PWM signal is an input, the output will be lost sometimes.
Blue : IFBx
Green : Input PWM signal

This phenomenon only occurs in mode4.
It also occurs when Duty is 10% to 0.5%.
It does not occur below 0.5%.
Could you tell me why happen this?

Sincerely.
Kengo.

over 2 years ago

0 Mason Wang over 2 years ago

TI__Genius 9630 points

hello Kengo

I am still working on this. On more question, what about the duty range 12.5%-10%?

0 Kengo.Y over 2 years ago in reply to Mason Wang

Guru 10485 points

Hello Mason,

Thank you for your reply.
If 100Hz PWM is set to 1100us or higher at the time of input, it will be in the analog diming mode and the phenomenon will not occur.
When inputting 200Hz PWM, it is 554us or more.

This phenomenon is only PWM dimming mode occurs.

Sincerely.
Kengo.

0 Mason Wang over 2 years ago in reply to Kengo.Y

TI__Genius 9630 points

hello Kengo

Thanks for your detailed description. I will try to test on the EVM and then feedback to you. May I ask you test condition, including the inductance?

0 Kengo.Y over 2 years ago in reply to Mason Wang

Guru 10485 points

Hi Mason,

Thank you for your reply.

I'd like to talk offline.
So I have requested friend ship.
Could you comfirm it?

Sincerely.
Kengo.

+1 Mason Wang over 2 years ago in reply to Kengo.Y

TI__Genius 9630 points

hello Kengo

It has been confirmed. thanks

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TPS61176: Output missing.