| 摘要 |
Systems and methods for hysteretically controlling Light Emitting Diodes (LEDs) in a high voltage environment. An example system includes a plurality of LEDs and a circuit electrically coupled to the plurality of LEDs. The circuit hysteretically controls an input voltage supplied to the plurality of LEDs based on an input voltage and a pulse width modulation signal, when the input voltage is greater than 18 volts. The circuit includes an N-Channel or P-Channel MOSFET switch for switching on and off the input voltage supplied to the plurality of LEDs, a hysteretic controller for generating a hysteretic control signal, and a subcircuit for controlling operation of the MOSFET switch based on the generated hysteretic control signal. The subcircuit maintains an acceptable voltage differential between a gate and a source of the MOSFET switch based on the generated hysteretic control signal and the input voltage.
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