A 198-ns/V VO-hopping reconfigurable RGB LED driver with automatic ΔVO detection and quasi-constant-frequency predictive peak current control

摘要

A CMOS RGB LED driver is presented, using cost-effective, single-converter, reconfigurable structure to bias RGB color LEDs accurately and adaptively. Automatic ΔVO detection and fast VO-hopping techniques are proposed, achieving 198-ns/V VO-hopping speed on 0.35µm CMOS. This is at least one order faster than the state-of-arts. While predictive peak current control and burst-mode operation are employed for robust operation, switching frequency is still stabilized around 1MHz by an adaptive off-timer for switching noise spectrum control. The driver consumes 8.6 times less headroom power than its fixed-output counterparts.