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TPS274160: TPS274160 is broken with inductive load

Andy Jin
Intellectual 440 points
Part Number: TPS274160
Other Parts Discussed in Thread: TPS4H160-Q1, TPS1HA08-Q1, TPS27SA08

Tool/software:

Hi expert, 

TPS274160 is broken when driving a 300mH@5Ω inductor load. I set the re Rcl=1K. But it looks it doesn't work actually.  The switch is closed when the current is over 2A, but it opened again soon and the current will be over 3.8A, then the IC is broken. 

Please help check what's wrong with this. 

Thanks a lot! 

   

  • 0
    TI__Mastermind 28300 points

    Hi Andy,

    When the device turns an inductive load off, the inductor current pulls the device output negative. In order to dissipate this energy/current, the device partially turns on to dissipate the energy over the FET, and clamps the output voltage to the VDS clamp voltage specified in the data sheet. However, if either the inductance and/or the current is too high, the device will not be able to dissipate that much energy and will overheat and get damaged.

    Please see Figure 6-20 of this app note: https://www.ti.com/lit/an/slvae30e/slvae30e.pdf?ts=1735249604029, which lists the maximum inductive discharge capability of TPS4H160-Q1, the automotive version of the TPS274160. When driving the load at 5Ohm, the current will be 24 / 5 = 4.8A, which is significantly higher than the device's discharge capability, and thus the device gets damaged.

    Three options I have for addressing this are:

    1. Use an external flyback diode for each channel that uses this load (most recommended).

    2. Use a device with a higher demagnetization capability, like TPS27SA08 (TPS1HA08-Q1 in the above app note).

    3. Parallel two channels of TPS274160 for these loads (not recommended, because it will still be cutting it close to the device's maximum discharge capability).

    Thanks,

    Patrick