TLC5926: seeking low noise led driver with I2C interface, no PWM

Matteo Bonino

Part Number: TLC5926
Other Parts Discussed in Thread: TLC59108

Tool/software:

Dears, (I've indicated a particular IC part number in the subject, but my question is more general, thanks).

I'm working on an audio project, and I'm searching for LED drivers with no PWM, to avoid noise. I need one sink (common anode LEDs) and one 'voltage' (common cathode LEDs) driver.

Could you please suggest two drivers, which could comply with the following requirements please ?

- I2C interface to microcontroller

- no PWM, this is important

- SSOP or DIP form factor, if possible

- Sink driver: 8 channels, 50mA (for the RGB LEDs and two backlight leds as well)

- 'Voltage' driver: 4 channels, 50mA

- Power supply of the MPU will be 3.15V, hence logic levels will be accordingly

Thank you very much in advance !

Cheers

Matteo

5 months ago

0 Suchen Dong 5 months ago

TI__Expert 4811 points

Hi Matteo,

It seems that you are seeking for a RGB LED driver, in this category RGB LED drivers | TI.com.

Please see TLC59108 (I2C, TSSOP, 3~5.5Vcc, 8 channel, 120mA, Current sink driver with analog dimming.)

Best regards,

Suchen

0 Matteo Bonino 5 months ago in reply to Suchen Dong

Prodigy 90 points

Thank you very much for your feedback ! Indeed, the TLC59108 is the one which captured my attention. If I understand correctly it's possible to selectively dim each led, through the digital I2C interface.

But, if I understand correctly, it's still implemented with PWM, no ? (I don't want PWM, as I'm afraid it induces noise on the audio path)

My question is: is there anything similar to the TLC59108, which can work without PWM ?

Thanks so much !

0 Suchen Dong 5 months ago in reply to Matteo Bonino

TI__Expert 4811 points

Hi Matteo,

The PWM frequency of this device is 97kHz. This could help minimize the audiable noise.

Best regards

0 Matteo Bonino 5 months ago in reply to Suchen Dong

Prodigy 90 points

Yes, indeed, maybe it's just me being paranoid. I'll give the TLC59108 a try. Thank you very much

0 Suchen Dong 5 months ago in reply to Matteo Bonino

TI__Expert 4811 points

Hi Matteo,

Glad you hear that. Thanks.

Best regards

Power management

Power management forum

TLC5926: seeking low noise led driver with I2C interface, no PWM