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TLC59116: OFF state current

Choon Shin
Prodigy 10 points
Part Number: TLC59116

Tool/software:

Hi,

What is the OFF state current of the OUT pins?

Even though all LED driver x, LDRx=00 of LEDOUT0/1/2/3 registers are OFF, the LEDs are still on with very dim light.

The white LED is Cree XD16 that supports up to 2A current.

Thanks in advance.

  • 0
    TI__Mastermind 30351 points

    Hi Choon,

    Thanks for reaching out! Our expert is traveling for business and he will get back to you early next week. Thank you for your patience.

    BRs

    Lucia

  • 0
    TI__Expert 5600 points

    Hi Choon,

    Could you help to check the current flow through the white LED when the very dim light was observed?

    From the spec shown in datasheet there will be max 0.5uA leakage current at VO = 17V for each output. So the sum leakage current may be uA level.

    Besides that, may I know what's the required current for the white LED in real application? And who's the customer and what's the end application?

    Best regards,

    Felix

  • 0 in reply to Felix Wang
    Prodigy 10 points

    Hi Felix,

    I'm attaching more detailed schematic.

    As we did more experiments, it turned out this is the LED cathode terminal's voltage level issue when both MOSFET and LED driver are off.

    So the White LED is blinked low dim light for very short time even though the LED driver is off at the MOSET turning on timing.

    This issue was resolved after adding a 100kΩ pull-up resistors at the LED driver outputs.

    Best,

    Choon