TPS92691-Q1: apllication issue

Kun Yuan

Part Number: TPS92691-Q1
Other Parts Discussed in Thread: TPS92691

hi E2e,

The schematic is as follow. We use TPS92691QPWPQ1 to drive 8 LEDs. Rated current 1A, maximum current 1.5A. The main problem is that when the LED lights up, there will be buzz on the PCB board (near the chip), please help to analyze the reasons. Thank you.

BRs,

Yuan

over 5 years ago

0 Tuan Tran74 over 5 years ago

TI__Genius 17630 points

Hi Kun,

The schematic you've attached is not readable. Can you get use a better copy of it?
Mean while, can you get the scope captures of the LED current, Vin, and PWM input and gate signal on the TPS92691. We are looking for instability in the output current in the audible range we will need zoom in of the scope capture when the LED current is zero if there is not PWM input.

Thanks Tuan

0 Kun Yuan over 5 years ago in reply to Tuan Tran74

Intellectual 945 points

HI,

As follow.

We has use15% drive led, it still has buzz sound.6712.LED.pdf

0 Tuan Tran74 over 5 years ago in reply to Kun Yuan

TI__Genius 17630 points

Hi Kun,

Do you have scope captures for what we requested in my previous post?

Thanks Tuan

0 Tuan Tran74 over 4 years ago in reply to Tuan Tran74

TI__Genius 17630 points

Hi Kun,

We have not heard back from you so we believe that you may have solved the issue. The thread will close now but will reopen if you reply.

Thanks Tuan

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TPS92691-Q1: apllication issue