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LTC2859/61 Short-circuit current & Thermal shutdown

Hi,

My customers are considering LTC 2859/61.

I got questions about short-circuit current protection and thermal shutdown.

<Short-circuit current protection>
#1  Does the maximum current 250 mA described in the section on Maximum Driver Short-Circuit Current and Driver

      Over Voltage and Overcurrent Protection of electrical characteristics be related?

#2  Does it make sense that the current limit drops to 120 mA when it exceeds ± 10 V?

#3  When Vcc = 5 V, I think that the pin voltage does not exceed ± 10 V, but what kind of state will it happen?

<Thermal shutdown>

#4   If a thermal shutdown occurs, even if the receiver and driver are enabled from the outside, is it internally disabled

       regardless of the enable voltage?

#5   Is there a method to check the occurrence of thermal shutdown?

Best regards,

Yuya

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  • Hi Yuya,

    1. Yes, the value listed in Maximum Driver Short-Circuit Current and Driver Overvoltage and Overcurrent Protection sections are matched.

     

    2. Yes, I think so.

     

    3. Figure 2 describes the driver output short-circuit current test method, if there are common mode voltage( -7V to +12V) injected to the bus pins, you will see the short-circuit current. If not, the bus state will follow the input signal.

     

    4. Yes, you could find it in the datasheet (P10):

     

    5. I think if thermal shutdown appears, the supply current will decrease a lot.

     

     

    Regards,

    Neil

Reply
  • Hi Yuya,

    1. Yes, the value listed in Maximum Driver Short-Circuit Current and Driver Overvoltage and Overcurrent Protection sections are matched.

     

    2. Yes, I think so.

     

    3. Figure 2 describes the driver output short-circuit current test method, if there are common mode voltage( -7V to +12V) injected to the bus pins, you will see the short-circuit current. If not, the bus state will follow the input signal.

     

    4. Yes, you could find it in the datasheet (P10):

     

    5. I think if thermal shutdown appears, the supply current will decrease a lot.

     

     

    Regards,

    Neil

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