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A dimmable and power-compensated AC direct LED driver with high efficiency for lighting applications is presented. A Source-Coupled Pair (SCP) is adopted to realize the soft self-commutating. There is no additional sensing or control circuitry, which lower the system power dissipation. A pulse-width modulation (PWM) dimming technique is applied in regulating the LED's brightness. Furthermore, the...
A multi-mode control strategy for primary-side regulation (PSR) system is presented. The idea uses four mode control strategy to improve the efficiency under variety load conditions. In addition, the usual peak current control mode is replaced by voltage control mode under standby condition. By this way, the pulse width of drive signal can be reduced regardless of the leading edge blanking time in...
A constant average output current flyback LED driver without auxiliary windings, opto-couplers or output voltage feedback resistors is proposed. A novel on-chip feedback method through parasitic capacitor of the power MOS to detect demagnetizing time of the magnetizing inductor is used in the driver. The proposed scheme reduces the cost and improves the compaction of flyback LED drivers. The driver...
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