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High Efficiency - Low Cost LED Dimming

From ON Semiconductor L.L.C.

This circuit can be thought of as having two separate
portions. There is a LED management portion and there is
a dimmer management and PWM Signal portion.
The LED management portion charges the output
capacitor to a "DC" state. The dimmer management portion
provides loading current for an SCR in a dimmer and
provides a gate voltage to the series pass MOSFET.

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