TCA6507: 1kHz PWM LED dimming

Ann_Lien

Part Number: TCA6507

Hello expert,

Customer is asking if TCA6507 could support 1kHz PWM dimming for LED. They will need 3 set for 1kHz PWM on output. Could you kindly help to comment on it? Thanks a lot!

Best regards,

Ann Lien

over 5 years ago

0 Miguel Robertson over 5 years ago

TI__Guru 62920 points

Hi Ann,

No, the nominal PWM frequency for this device is 125 Hz. This is typically fast enough not to be perceptible. Out of curiosity, can you please let me know why 1 kHz is desired for this application?

Thanks,
Max

0 Henry Yan1 over 5 years ago in reply to Miguel Robertson

Prodigy 30 points

Hi Max

Because We use PWM to our RT8511BGQW IC for Heater solution.

As we known, RT8511BGQW could use PWM frequency from 100Hz to 8KHz.

Until now,our test always use 1KHz PWM to push 150 mA current.

So we hope 1KHz could be push from TCA6507.

Thanks!

0 Miguel Robertson over 5 years ago in reply to Henry Yan1

TI__Guru 62920 points

Thank you for the clarification; I understand. Unfortunately such a high frequency isn't possible with TCA9507, but since RT8511BGQW can work with 125 Hz at least it is possible to try this lower frequency. If you find that you need the higher PWM frequency there are other methods for generating PWM waveforms you can find at the resources below.

http://www.ti.com/lit/ug/slau508/slau508.pdf

http://www.ti.com/lit/ug/tiduc97a/tiduc97a.pdf

Regards,
Max

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TCA6507: 1kHz PWM LED dimming