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TPIC6C596: Current capability

Jatin Mayekar
Prodigy 250 points
Part Number: TPIC6C596
Other Parts Discussed in Thread: TPIC6B595

Hi,

I wanted to confirm the current capability of TPIC6C596. It's mentioned in the sheet the peak drain current-single output is 250mA with a pulse duration of 100us and 2% duty cycle while the continuous drain current, each output, all outputs on is 100mA. Here's the datasheet info:

So I want to know:

1. How much continuous current can I draw only from one output? I know the peak can be 250mA but I want to know the continuous current value only for one output.

2. Also, the continuous drain current, has a note saying that the pulse duration <= 100 microseconds and duty cycle <= 2%? The pulsed drain current, each output, all outputs on is 250 mA also has the same note.

I do not understand why both the continuous drain current and the pulsed drain current both have pulse duration and duty cycle limit. Only the pulsed drain current should have pulse duration limits. If I am wrong, can you explain what's the difference between pulsed and continuous drain current with respect to the driver?

3. Also, is there a way I can test the functionality of the driver to check if it's properly switching the outputs according to the serial input that I provide before I connect in my main circuit? 

Thank you for your help.

  • 0
    TI__Genius 15776 points

    1. How much continuous current can I draw only from one output? I know the peak can be 250mA but I want to know the continuous current value only for one output.

    -100mA 

    2. Also, the continuous drain current, has a note saying that the pulse duration <= 100 microseconds and duty cycle <= 2%? The pulsed drain current, each output, all outputs on is 250 mA also has the same note.

    -during continue drain mode, we also has the pulse test. so you can regard the continue current is 100mA. 

    3. Also, is there a way I can test the functionality of the driver to check if it's properly switching the outputs according to the serial input that I provide before I connect in my main circuit? 

    -Which function you want to check?

  • 0 in reply to Frank Qiu
    Prodigy 250 points

    Thank you Frank for replying.

    I was a bit unclear in my previous questions so let me clear it out here.

    1. How much continuous current can I draw only from one output only when one output is on and all others(7) are switched off?  Check this figure below I got from the datasheet:

    2. So does the continuous current have a pulse duration and duty cycle limitation on it? Because I intend to use it for more than 100 microseconds continuously.

    3. Is there any function similar to Fault Detection?

    My intention is to use this driver to drive an IR LED(LIZ-0940) at 200 mA continuous current with only one output at a time. Will it be possible? If not, is there another LED driver which can provide this current? I know there is TPIC6B595 which can handle 150 mA.

  • 0 in reply to Jatin Mayekar
    TI__Genius 15776 points

    1. How much continuous current can I draw only from one output only when one output is on and all others(7) are switched off?  Check this figure below I got from the datasheet:

    -100mA, the table consider the thermal condition. 

    2. So does the continuous current have a pulse duration and duty cycle limitation on it? Because I intend to use it for more than 100 microseconds continuously.

    -If the temp of device isn't beyond the max range, continuous current don't have a pulse duration and duty cycle limitation 

    3. Is there any function similar to Fault Detection?

    - it doesn't have open or short LED detection.