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Adjustable Low Drop Current Limiter 2014-03-28

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crutschow submitted a new article:

Adjustable Low Drop Current Limiter - Current limiter with max voltage drop of ~1V during normal operation, minimizing dropout voltage.

An LM317 is often used as a current limiter for a power supply but you must allow about 3V across it for normal operation which increases the required input voltage and dissipation for a given current and load voltage. This circuit is a little more complex but it can generate a voltage drop of less than a volt (about one base-emitter voltage drop) during normal operation depending upon the current limit range.

The circuit below uses a P-MOSFET as the current limit element and a PNP to detect...
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