TLC5947: TLC5947 schematic check

Lawrence He

Genius 3280 points

Part Number: TLC5947

Dear,

our client want to design TLC5947 and need double confirm as below schematic

If any concern, Please advise me.

Thanks,

Best regards,

Lawrence.

over 5 years ago

0 Charles-Chen over 5 years ago

TI__Genius 11836 points

Hi Lawrence,

What's your purpose of this part of schematic? Out LED driver seems to only pull down the PWM signal of FET.

Besides, please pay attention to protection of customer privacy.

0 Lawrence He over 5 years ago in reply to Charles-Chen

Genius 3280 points

Hi, Charles

is for slot machine application, and PWM control for LED.

if any concern, Please advise me.

Thanks,

Best regards,

Lawrence.

0 Lawrence He over 5 years ago in reply to Lawrence He

Genius 3280 points

Hi, Charles

about schematic have any concern?

TLC5947 typical application,

our application, (is 10K ohm pull-up wrong?)

if any, Please advise me.

Thanks,

Best regards,

Lawrence.

0 Charles-Chen over 5 years ago in reply to Lawrence He

TI__Genius 11836 points

Hi Lawrence,

The outx of TLC5947 is floating when channel is off. You need to use additional power supply to driver the FET for PWM-control. So the original method is right. However, the solution seems to be strange. What's your voltage of LED_VCC?

0 Lawrence He over 5 years ago in reply to Charles-Chen

Genius 3280 points

Hi, Charles

We don`t understand " TLC5947 is floating when channel is off?? what`s mean?

if any, Please advise me.

Thanks,

Best regards,

Lawrence.

0 Charles-Chen over 5 years ago in reply to Lawrence He

TI__Genius 11836 points

Hi Lawrence,

When the channel is off, the "PWM-Control" in your circuit is floating, you need a source to pull up the "PWM-Control" on this occasion.

Power management

Power management forum

TLC5947: TLC5947 schematic check