TCPP01-M12 FLT fault indicator

RMas · ‎2023-01-05

I'd like to add an LED indicator to the FLT pin so it sinks current when it becomes active low. The LED anaode would be tide high with a resistor in series. The spec sheet says this pin has a resistance of 250Ohms when active. How much current can this pin sink and is approach a suitable way to achieve this?

Peter BENSCH · ‎2023-01-05

As you will have seen, the maximum current in pin FLT/ is not specified in the data sheet.

However, since this is a logic output that is normally working on a pull-up of 10k, you can probably assume an applicable current of 1mA, which is a bit low for most LEDs. Therefore, it maybe makes sense to drive the LED with an amplifier, e.g. a single-gate logic gate, a pnp BJT or a logic level p-channel FET.

Does it answer your question?

Regards

/Peter

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