TLC5940: LED driver for matrix 7*24

Paul Antunes

Part Number: TLC5940
Other Parts Discussed in Thread: TLC6C5912, , TLC5947, TLC59283

dear led driver team,

I have new request from customer who wants to design a display panel using discrete white LEDs (20mA each).

Display will be built with matrix LED 7 * 24 (row * column).

Customer idea is to drive 7rows from MCU using GPIOs and LED driver to control 24columns.

He identified TLC6C5912 and TLC5940 as good options.

TLC5940 sounds better solution because autonomous and requires less power/activity from MCU (grayscale pwm control).

Input voltage= 3.3V or 5V

Which solution do you recommend for customer application ? feel free to suggest alternatives.

regards,

Paul

0 Kenneth Du over 6 years ago

Hi, Paul,

Since it's 24 columns, how about using TLC5947?

It's 24CH LED driver, and has 4MHz internal Oscillator, which is much easier to use.

Thanks.

Regards,

Kenneth

0 Paul Antunes over 6 years ago in reply to Kenneth Du

Hi Kenneth,

do you see any concern using PWM integrated solution (tlc4947) since at least 7x multiplexing solution is required ?

what about using tlc59283 ?

regards,

paul

0 Kenneth Du over 6 years ago in reply to Paul Antunes

Hi, Paul,

If you just use one TLC5947, the concern is the refresh rate is lower than 4MHz/4096/7=140Hz.

TLC59283 is also a choice and more suitable to be multiplexing, but it doesn't have PWM function.

Thanks.

Regards,

Kenneth

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