LED Drivers/LCD Bias

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power dissipation
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  • Forum Post: Re: TLC5927 / power dissipation

    Brigitte
    Hello Carl, The biggest portion will be the power dissipation caused by the LED currents. The TLC5927 has to dissipate the power coming from the LED power supply through the diodes to GND which is not taken from the LEDs, therefore for all 16 outputs the maximum power dissipated per output will be...
    on Jul 26, 2010

  • Forum Post: Re: TLC5940 with no load

    Michael Day
    The TLC5940 is operating properly. If you have the output programmed to sink current, but the output is open, the IC trys harder and harder to turn on the internal FETs which results in higher input current to the IC. This will not damage the IC. If you want to reduce power consumption, program unused...
    on Dec 28, 2010

  • Forum Post: Re: TLC5924 Junction Tempurature

    Brigitte
    Hello A Train, The junction to case thermal resistance of this package is below 5°C if you have a highK board. So in general I expect that the part will work in your configuration without a thermal error setting with 70°C ambient temperature. I always recommend to test this at the highst ambient...
    on Mar 2, 2011

  • Forum Post: Re: Using TLC5947 (or other LED driver) with incandescent bulbs

    Brigitte
    Hello Iko, You are right, all outputs can be on at the same time. I expect your question is about power dissipation inside the IC, right? If this is the case, if all outputs are on with 28V on each output, the IC will not be able to stand this power. The most power dissipation is not inside...
    on Apr 18, 2011

  • Forum Post: Re: tlc59116: max led power supply + power dissipation

    Brigitte
    Hello Nicola, If you want to use a higher voltage than 17V for the LED voltage, I would recommend to use a transistor in series to the LEDs in front of the output. Please refer to application note SLVA280 for the circuit details. This circuit is not tested with TLC59116, but it should work the same...
    on Aug 5, 2011

  • Forum Post: Re: tlc59108 power dissipation

    Brigitte
    Hello Nicola, You are correct, the thermal information is not part of this document. With the next review of the datasheet we plan to add this information. Please check the TLC59108F datasheet for the thermal impedance data for the 2 packages. The part is very similar so you can use this data....
    on Oct 11, 2011

  • Forum Post: Re: tlc59108 power dissipation

    Brigitte
    Hello Nicola, Just for your information, the datasheet now includes the thermal information as well. Please check it out. Best regards, Brigitte
    on Jan 9, 2012

  • Forum Post: Re: TLC5940 in series with parallel outputs and heat

    Brigitte
    Hello Aaron, For the heat on the 2nd IC, I do not really have a good explanation. Normally when you write all 0s in the registers of all 3 parts, the part should not get hot. So please make sure that you sent 578 bits to write all 3 greyscale registers to 0s. You might check the supply voltages...
    on Feb 24, 2012

  • Forum Post: Re: TLC5940 in series with parallel outputs and heat

    Brigitte
    Hello Aaron, When you attach 12V to the LED and turn on all outputs, you will have a huge power dissipation inside the IC. The ICC is somehow dependent on the RILIM resistor as well as the amount of outputs on and the data transfer rate you are using. So if you want to know the exact current consumption...
    on Feb 27, 2012

  • Forum Post: TLC5940 in series with parallel outputs and heat

    Aaron Attar
    This is for a large display application. The RGB LED's require a forward voltages of 2.6, 3.6, 3.6 and 350mA each R, G, and B. At first according to my calculations a 5.2V 27A source would be enough for each MOSFET switch, but then the LEDs would stop increasing in brightness (and begin to lowering...
    on Feb 24, 2012

  • Forum Post: TLC59116 power dissipation

    Matthias Stockhaus
    In my design I have three green leds (forward voltage each ~3.5V) in serial per channel and a ledvoltage of 12V. I want to minimize the power dissipation across the driver ic. I'm looking for informations about the optimal driver voltage drops.
    on Mar 15, 2012

  • Forum Post: Re: TLC5927 running hot!

    Brigitte
    Hello Sergei, The maximum output voltage capability is necessary when the LEDs are off because then the voltage on the output will increase. In addition the output voltage capability does not mean that the IC is able to handle the power dissipation without additional cooling. The power inside the...
    on Apr 4, 2012

  • Forum Post: tlc5971 dissipation power

    mahmut t���
    Hello all, I am designing a led screen using tlc5971. My design is same as the first application circuit in data sheet. I adjusted the Iref so that the current over leds is 30mA. And my vcc is 12v. What is the difference in power consuption in TLC5971 if i use a single led per channel or three leds...
    on Mar 21, 2013

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