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TPS560430: TPS560430Y cannot sustain 24V

Girish Pundlik1
Prodigy 10 points
Part Number: TPS560430

I am working with TPS560430YDBV samples for a stepper motor controller device to generate 5V from 12~24V supply.

I had been testing it with a 9V adapter for hours without problem. However, when I connect the board to 24V, the unit works for a while until the regulator dies, no more 5V. This has happened with 3 different boards.

The power supply is 24V 15A SMPS, shared with 2x 24V/2.5A Nema23 stepper motors. Parts used are:

Input capacitor: 2.2uF/50V X7R 1206 and 0.1uF/50C X7R 0805
Inductor: SRN4018TA-100M, 10uH/1.2A
Output capacitor: 2x 10uF/16V 1206
Output setting resistors: 75k and 18.7k
Load is around 100~150mA

Schematic is same as recommended in the datasheet.

Is there any failure data for this device? At this point using this device seems rather risky. We are yet to completely test our product and burn test for at least 48 hours. Is there any better device available in same/similar footprint?

These devices normally are almost indestructible when used within specifications having various protection features like short-circuit, over-voltage, under-voltage, thermal shutdown etc. I have not had any issue with any other TI regulator yet, but this one is rather curious. Having said that, could it be possible that for some reason the target circuit is blown and putting the perfectly good regulator into shutdown!?

Thanks,

Girish

  • 0
    TI__Mastermind 30615 points

    Hi Girish,

    You can test TPS560430 circuit with bench DC power supply 24V and load current=200mA for hours, no connect the PS to motor during test. 

    If no failure, then the issue maybe caused by input overvoltage during motor operating.

    You can add  33 ohm 0.5W resistor and 100uF /35V electrolytic cap on TPS560403 input to filter out the voltage spike.

    B R

    Andy

  • 0 in reply to Andy Chen
    Prodigy 10 points

    Hi Andy, thanks for the quick reply. I was indeed thinking of adding some filtering at the supply input with a suitable ferrite bead and larger capacitor.

    However, only one board was used with stepper motors that failed, the same one that was used during firmware testing. Other boards had the 24V supply for themselves, no stepper drives.

    A fourth board never used 24V, it used another wall adapter rated 9V with actual output of 10.5V, it worked for a few minutes and now the output voltage reads 0.13~0.14V instead of 5V.

    I am rather surprised that while the first test board worked for hours while we completed the firmware, the moment we put it on 24V, the failures started. Even with the fourth board with minimal circuitry that was never connected to 24V supply.

    It will be a while till I get a few more TPS560430Y devices to test. Till then, I will try moving the devices that have supposedly failed, on a bare board with just the regulator parts to see whether they have actually failed.

    Thanks,

    Girish

  • 0 in reply to Girish Pundlik1
    TI__Mastermind 30615 points

    Hi Girish,

    In the meanwhile, can you upload the PCB layout of TPS560430 section for review?

    B R

    Andy

  • 0 in reply to Andy Chen
    Prodigy 10 points

    Hello,

    It seems something is wrong with the post editor, cannot upload images or files.

  • 0 in reply to Girish Pundlik1
    TI__Mastermind 30615 points

    Hi,

    Sorry for the trouble,

    Pls try it again

  • 0 in reply to Andy Chen
    Prodigy 10 points

    Hello, I still cannot upload any local files.

  • 0 in reply to Girish Pundlik1
    TI__Mastermind 30615 points

    Hi Girish,

    Pls email to me at andy.chen@ti.com for checking.

    B R

    Andy