12V White LED Driver

The heart of the circuit is a string of 10 white LEDs. These are wired in series and connected to a current-regulated step-up switching power supply circuit. DC powered LED lighting circuits can vary from the trivial, with a single LED and a series resistor, to more complicated switching power supply circuits such as this project. There is a tradeoff between simplicity and circuit capabilities. This more complex circuit adds features such as a regulated light level and automatic circuit shutoff on low input voltage. The circuit also protects the LEDs from too much current when the supply rises above 12V.
12V White LED Driver - schematic

By using a high frequency switching regulator, the power loss associated with the current dropping resistors found in simpler circuits is eliminated. This offsets the power consumed by the extra active parts. This circuit can power 10 white LEDs at 24mA o

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