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TPS2549-Q1: Short to VBUS Protection

Abraham Rashid
Expert 3030 points
Part Number: TPS2549-Q1

Hi team,

I have some questions about TPS2549IRTERQ1

1. How does hysteresis work in DP_IN and DM_IN SHORT-TO-VBUS PROTECTION? If the protection is triggered at 3.7V, then it will be released at 3.6V with 100mV hysteresis?

2. Are DP_IN , DM_IN and DP_OUT，DM_OUT pins powered with different supplies? Or they are connected directly? I see the switch on resistance of DM and DP is around 2 ohms, will the voltage of DP_OUT，DM_OUT pins be lower than DP_IN , DM_IN because of the voltage drop on the switch resistor?

  • 0
    TI__Expert 8420 points

    Hi,

    1. How does hysteresis work in DP_IN and DM_IN SHORT-TO-VBUS PROTECTION? If the protection is triggered at 3.7V, then it will be released at 3.6V with 100mV hysteresis?

    --> Yes, your understand is correct.

    2. Are DP_IN , DM_IN and DP_OUT，DM_OUT pins powered with different supplies? Or they are connected directly? I see the switch on resistance of DM and DP is around 2 ohms, will the voltage of DP_OUT，DM_OUT pins be lower than DP_IN , DM_IN because of the voltage drop on the switch resistor?

    --> Between DP/M_IN and DP/M_OUT will have a power FET , the FET  body diode will has 0.7 drop when the data switch haven't turn on. 

    When the data switch turn on the DP/M_OUT pin voltage should be same as DP/M_IN as the signal current is very small (about 20mA). 

    V