NCL30051

NCL30051 PFC and Half-Bridge Resonant Combo Controller for LED Lighting The NCL30051 is a combination of PFC and half−bridge resonant controllers optimized for off−line LED lighting solutions. This device integrates all the features needed to implement a highly efficient and small form factor LED Driver/Power Supply. It contains a critical conduction mode (CrM) power factor correction (PFC) boost controller and a half−bridge resonant controller with a built−in 600 V driver. The half−bridge stage operates at a fixed frequency, greatly simplifying the control implementations. The output (current or voltage) regulation is achieved by adjusting the PFC stage output voltage − based on a control signal generated external to the NCL30051. This device includes an enable input on the PFC feedback pin, open feedback loop protection and PFC overvoltage and undervoltage detectors. Other features included in the NCL30051 are a 600 V startup circuit and an adjustable frequency oscillator with a divide by 2 circuit to assure true symmetric duty ratio. The controllers are properly sequenced, simplifying system design. Features Voltage Mode CrM Power Factor Correction Controller PFC Open Feedback Loop Protection PFC Undervoltage Detector PFC Overvoltage Detector Half−Bridge Stage with 600 V High Side Gate Drive State Machine Ensures Proper Turn−on and Turn−off of Half−Bridge Stage Controllers are Properly Sequenced for Fault Free Operation Non−Latching Fault Management Inte...