ZHCSCK8G May 2014 – October 2017 LP8860-Q1
PRODUCTION DATA.
Hybrid dimming combines both PWM and current-dimming benefits offering the best optical efficiency to drive LEDs. At higher brightness levels only the LED constant current is controlled; at lower brightness levels LED brightness is controlled by adding PWM on top of low constant current value.
Because LED optical efficacy declines with high forward current, reducing the current yields better system optical efficiency compared with conventional PWM dimming. An additional benefit of current dimming is reduced EMI compared to PWM switching. PWM dimming is used with lower brightness values to achieve a higher dimming ratio. The optimum switch point between PWM and current dimming is programmable and depends on the LED type.