LED Drivers/LCD Bias

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tlc5946
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  • Forum Post: Re: Strange behavior from a TLC5946

    Michael Day
    It sounds like the control signals may be miswired or misprogrammed. The TLC5946 will not keep any outputs on after 4096 grayscale clocks unless BLANK is toggled. If you wait 20,000 grayscale clocks between BLANK pulses, the outputs can stay on a maixmum of 4096 pulses and then must turn off. Note that...
    on Dec 28, 2009

  • Forum Post: Strange behavior from a TLC5946

    david greenberg
    Hello, I am trying to operate a TLC5946 to no avail. I am driving it with a microcontroller connected to the tlc by a ~30" 6 conductor ribbon cable. I have used an oscilliscope to check the signal quality at the microcontroller and at the TLC5946, and the signals all appear to be uncorrupted...
    on Dec 28, 2009

  • Forum Post: Re: TLC5946 Ground Noise Issue

    Michael Day
    This is probably a layout issue. You may have large switching currents in the ground plane flowing past the more sensitive analog ground currents associated with the control signals. When your +V voltage is very low, the TLC5946 probably turns the outputs on and off slower than when the +V is higher...
    on Feb 9, 2010

  • Forum Post: Re: TLC5946 Ground Noise Issue

    david greenberg
    I tried using 22uF bypass capacitors across the TLC5946's VCC and GND, to no avail. I also added an additional path to ground (the board is very cramped and has very few grounds, so only this additional path exists). Could bypassing +V be a potential solution? Also, are there descriptions on how...
    on Feb 9, 2010

  • Forum Post: Re: TLC5946 Ground Noise Issue

    Michael Day
    There is no description of how the IC works with different voltage on OUTn. The IC requires a minimum voltage (specified in the datasheet) on OUTn to meet specifications. Adding additional capacitance may help. Specifically, you need to follow the path of an electron as it flows from the input voltage...
    on Feb 9, 2010

  • Forum Post: TLC5946 Ground Noise Issue

    david greenberg
    Hello, I'm having a problem with ground noise in a circuit I've made using a TLC5946. I have connected a the TLC5946 to a microcontroller that is sending it data. The LEDs connected to the TLC have a power dissipation resistor between them and +V so that the TLC5946 will have to dissipate less...
    on Feb 9, 2010

  • Forum Post: Re: TLC5943 - spurious internal reset ?

    Brigitte
    Hello Matt, You mention that you have to reload the same data after the problem occurred and then the system works properly again. What happens if you are not reloading the data at all and just turn BLANK off and on without reseting anything else in the system? Is the problem maybe just happening...
    on Apr 13, 2012

  • Forum Post: TLC5946 / TLC594x cyclic BLANK required?

    Stephan Schirrmann
    I'm having issues with a TLC5946. What I originally did, is SCLK, SIN, XLAT, MODE and XHALF connected to MCU GSCLK connected to independent oscillator (30MHz) BLANK not used / set to 0 So, what I expected, is that the PWMs would run independently and continuously after having been set...
    on Jul 7, 2012

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