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TPS7H5001-SP: CS_ILIM

Noriyuki Takahashi
Genius 11030 points
Part Number: TPS7H5001-SP

Tool/software:

Hi team,

According to the link below, it is suggested to apply ~0.1 V voltage to the CS_ILIM pin to protect against any missed cycles. Could you please explain the reason in detail why the voltage input is required? 

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1188134/faq-tps7h5001-sp-how-do-i-use-the-tps7h500x-sp-family-as-a-voltage-mode-controller?tisearch=e2e-sitesearch&keymatch=TPS7h5001

And when they use the device at voltage mode control, can they still use the CS_ILIM pin as the over-current protection?

Regards,

Noriyuki Takahashi

  • +1
    TI__Mastermind 28745 points

    Hey Noriyuki,

    The 0.1 V is a recommendation to guarantee that the internal input offset voltage in the comparator won't causes any issues.

    When used in voltage mode control, CS_ILIM would not typically be used as over-current protection.
    In order to achieve full use of the error amplifier and duty cycle range, it cannot be used as a current limit.
    Use as a current limit would reduce this range and thus is not suggested.

    One can implement an external current limit using the FAULT pin.

    Thanks,
    Daniel