| 摘要 |
<p>A LED driver circuit includes a pulse width modulator and at least one voltage/current control circuit. The pulse width modulator includes an input coupled to receive a DC supply signal, an output for providing a modulated DC supply signal, and a feedback input operable to receive a feedback signal, the feedback signal operable to indicate the input load impedance of the LED device. The pulse width modulator is operable to control the pulse width of modulation applied to the DC supply signal depending upon the LED device input load impedance as it is detected by the feedback signal. The at least one voltage/current control circuit includes an input coupled to receive the modulated DC supply signal and an output for providing a regulated LED supply signal to the LED device.</p> |
