TLC5928: Adjusting ILED

Hirotsugu Kobayashi

Mastermind 9385 points

Part Number: TLC5928

Tool/software:

Hi team,

Is it possible to adjust the LED current by controlling the IREF pin externally?

7 months ago

0 Jared Zhou 7 months ago

TI__Mastermind 20515 points

Hi Kobaya,

If the IREF pin is open, the output will not have any current. You can change the resistor value to change the maximum output current but please don't open this pin.

BR, Jared

0 Hirotsugu Kobayashi 7 months ago in reply to Jared Zhou

Mastermind 9385 points

Hi Jared,

My explanation was insufficient.
The current value is changed externally by changing the resistance of the FET with an op-amp.
The maximum current is limited by a fixed resistor, and changed linearly with the op-amp.

Is it possible to use it in this way?

Best regards,

0 Jared Zhou 7 months ago in reply to Hirotsugu Kobayashi

TI__Mastermind 20515 points

Hi Hirotsugu,

Can you please send me a email to explain how this works? (jared-zhou@ti.com) Thanks!

BR, Jared

0 Hirotsugu Kobayashi 7 months ago in reply to Jared Zhou

Mastermind 9385 points

Hi Jared,

Ok, I sent you an email.

+1 Jared Zhou 7 months ago in reply to Hirotsugu Kobayashi

TI__Mastermind 20515 points

Hi Hirotsugu,

Thanks for reaching out!

I will review it and reply to you soon. Let's talk about this on email, thanks!

BR, Jared

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TLC5928: Adjusting ILED