TPS61181: TPS61181 output voltage discussion

TT_Chin

Expert 2025 points

Part Number: TPS61181

Hi Sean,

If total Vf is 14.4V and Vin is 13.2V, any concern need to be check for this boost LED power solution of TPS61181?

Please also see attached.

Thnaks!

Sincerely,

Chin

TPS61181 circuit discussion.docx

over 6 years ago

0 Kenneth Du over 6 years ago

TI__Genius 14295 points

Proper engineer has been assigned to take a look at this.
Due to public holidays, the reply may be delayed.
Thanks for your understanding.

0 Sean Zhou over 6 years ago

TI__Mastermind 22745 points

Hi Chin,
For Vin=13.2, Vout=14.4, the minimum duty cycle is about 8%, the minimum duty cycle for TPS61181 is less than7%, so you can make sure the duty cycle will never less than 7%, it's ok. But if your input or output voltage varivation is latge, there may be some risk.
Regards
Sean

0 TT_Chin over 6 years ago in reply to Sean Zhou

Expert 2025 points

Hi Sean,

Thanks for your answer.

By the way, if minimum duty cycle less than 7%, e.g.,3%, what symptom will happen?

Thank you!

Sincerely,

Chin

0 Sean Zhou over 6 years ago in reply to TT_Chin

TI__Mastermind 22745 points

Hi Chin,
It may can't regulate the output voltage when it triggers the minimum duty cycle.
Regards
Sean

0 TT_Chin over 6 years ago in reply to Sean Zhou

Expert 2025 points

Hi Sean,

Okay, thanks for your answer!

Sincerely,

Chin

Power management

Power management forum

TPS61181: TPS61181 output voltage discussion