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TMCS1100: Behaviors at Overcurrent

Takashi Onawa
Genius 13200 points
Part Number: TMCS1100

Hi Team,

Some quick questions.

When an overcurrent occurs in my customer's circuit, there is a possibility that a maximum of 60A(10ms single pulse) current may flow through the sensing part of the current sensor.

1. What happens to the VOUT when the current beyond the measurable range is input to the TMCS1100?
2. From the Single-Pulse Leadframe Capability graph, Fig 34, I understand that the TMCS1100 will not be destroyed to about 100 A for a single 10 ms pulse, is this understanding correct?

Regards,

Takashi Onawa

  • 0
    TI__Mastermind 22835 points

    Hello Takashi,

    1.  Depending on the variant, the supply, and reference supply, 60A might still be within the measurable range.  However, lets consider an example where it is not.  Lets look at the instance in which your supply is 5V, the reference is 2.5V, and the ideal output should be reference + (0.05V/A)*60A=2.5V+3V.  In this case your supply voltage limits the output. It will approach 5V, but not ever reach or exceed it. This corresponds to the swing to Vs power-supply rail, which typically is a voltage 20mV below the supply.

    2. With the EVM layout this is correct.  For smaller input traces, you may sufficiently reduce the amount of heat that can be sunk away from the lead frame, thereby making the device more susceptible to thermal damage.

  • 0 in reply to Patrick Simmons
    TI__Genius 13200 points

    Hi Patrick-san,

    Thanks,  I understood.

    Regards,

    Takashi Onawa