Apparatus amd method to provide a hybrid linear/switching current source, such as for high-efficiency, wide dimming range light emitting diode (LED) backlighting
作者： Walter P. M. Gurr
DOI:
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摘要: A hybrid power supply (200) provides powers to a load (208), such as light emitting diode (LED) backlight display, using pulse width modulation (PWM) enable signal control activation of linear (202) and switching (204). During an initial part active portion duty cycle the PWM signal, is activated (208) with constant current. remainder deactivated (204) provide current (208). bias voltage may be provided LED during inactive signal. The combines high efficiency smooth dimming at low luminance supply.
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