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PMW with TLC59711.
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PMW with TLC59711.

by mvonrose on Fri Jun 11, 2021 3:54 pm

Has anyone controlled something like a Pico Buck with a TLC59711? I understand that I need to put a pull-up resistor on the output pins of the TLC59711. Does this mean just attaching something like a 10k resistor between the output pin and a 5v supply and then attaching the output on the TLC to the PWM input on the Pico Buck? Sorry if my language is clunky as this is all a bit new to me.

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Re: PMW with TLC59711.

by adafruit_support_mike on Tue Jun 15, 2021 12:02 am

Hmm.. interesting question.

Looking at the Pico Buck's schematic and the AL8805W5 buck converter's datasheet, it looks like the CTRL input can be driven from an open-drain control pin. The TLC59711 has open-drain outputs, so it might work with a direct connection.

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Re: PMW with TLC59711.

by mvonrose on Fri Jun 18, 2021 2:04 pm

I've tried connecting it directly and it seems to either set the picobuck on or off: there's no in-between.

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Re: PMW with TLC59711.

by adafruit_support_mike on Sat Jun 26, 2021 9:22 pm

The TLC59711 uses PWM to control LEDs, so that shouldn't be any trouble.

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