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TPS1HTC30-Q1: Usage of EN for switch on/off inductive load (fan)

Thomas Schabel
Prodigy 20 points
Part Number: TPS1HTC30-Q1

Tool/software:

Is it possible to us EN to switch on/off inductive loads, e.g. fan with 50W/24V. The ILIM will set to 2.5A. From dedicated fan datasheet we got startup current of around 3 time normal current.

The device shall protect shortage on fan-connector or any fault condition of the fan. Shortage of fan-connetor without any damage is also required by standard and test-spec.

  • 0
    TI__Intellectual 770 points

    Hi Thomas,

    How much of an inductance is on the load? This can help us determine how much power is dissipated. Please see the following application note - how to drive resistive, inductive, capacitive, and lighting loads, specifically section 4.5.3 on total energy dissipated during demagnetization (https://www.ti.com/lit/an/slvae30e/slvae30e.pdf?ts=1697434994373). The equation below can help and is from the note.

    Thanks,

    Rishika Patel 

  • 0 in reply to Rishika Patel
    Prodigy 20 points

    Hi Rishika,

    unfortunately, I have no inductance. The requirement is to drive a fan with up to 50W at 24V. I got an example = fan type 3254 J/2 H3P (Product Detail). In datasheet there is no information about inductance of the fan.

    We just think about behavior of startup current. According fan DS the startup current at 24V is given by <= 3100mA (normal operation 24V/1310mA). The startup behavior for that case is more or less similar to driving capacitive loads, I guess. And I have to take care of current limitation an thermal behavior.

    Regards Thomas

  • 0 in reply to Thomas Schabel
    TI__Intellectual 770 points

    Hi Thomas, 

    You mentioned that the startup current is 3.1A however your ILIM is set to 2.5A. So, with that the current will not go over 2.5A. The high side switch will clamp the current at the limit until thermal shutdown or the overcurrent condition is removed. Is the 3.1A required for startup? Will your fan still work in this configuration?

    Thanks, 

    Rishika Patel