Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
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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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