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TPS1H100-Q1: current limit clarification

Part Number: TPS1H100-Q1

Hello Guys,

Good day.

Our customer would like to understand in more details the tolerance on the maximum current that he can draw from the part before the current limit will come in to effect for all device and operating corners.

In his design he have a RCL of 2.4kOhm, which gives a current limit of ~1A, can he rely on being able to draw up to 1Amp always without risk of the smart switch interrupting the current?

In the datasheet, what does it mean by "(3) external current limit accuracy is only applicable to overload conditions greater than 1.5x the current limit setting"? what is the expected behavior if he is operating at < 1.5x the current limit?

Thanks in advance!

Art

  • Art,

    The TPS1H100-Q1 is an automotive device where the majority of current limiting events deal with quick changes of impedance on the output such as short-to-ground or capacitive inrush. In general, you should set your current limit so that it is 1.5x away from your maximum nominal operating load current. If 1A is the maximum that you ever want your device to operate under non-fault conditions, the current limit should be set to 1.5A.

    The "1.5x" number refers to "soft short" conditions. These are conditions where the output impedance might have a "partial short" where the impedance decreases, but does not decrease enough to be considered an "overload". An "overload" condition is where the voltage drop over the switch itself is greater than 2.5V. In these conditions it will take 1.5x the value of the set current limit to engage and for the output current to be regulated to the set current limit (within the accuracy ranges of the device).