NCP1901

NCP1901 Advance Information Primary Side Combination Resonant and PFC Controllers The NCP1901 is a combination of PFC and half−bridge resonant controllers optimized for off−line adapter applications. This device includes all the features needed to implement a highly efficient and small form factor adapter. It integrates a critical conduction mode (CrM) power factor correction (PFC) controller and a half−bridge controller with a built−in 600 V driver. The half−bridge stage operates at a fixed frequency. Regulation is achieved by adjusting the PFC stage output voltage. 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 NCP1901 are a 600 V startup circuit and an adjustable frequency oscillator. The controllers are properly sequenced, simplifying system design. Adjustable Half−Bridge Frequency up to 75 kHz Open Feedback Loop Protection CrM Power Factor Correction Controller PFC Undervoltage Detector PFC Overvoltage Detector Half−Bridge Controller with 600 V High Side Gate Drive State Machine Ensures Proper Turn−on and Turn−off of Half−Bridge Stage Enable Input on the PFC Feedback Pin Disables Controllers and Reduces Power Controllers are Properly Sequenced for Fault Free Operation Internal 600 V Startup Circuit This is a Pb−Free Device http://onsemi.com SO−20 WB DW SUFFIX CASE 751D SOIC−16 D SUFFIX CASE 751B MARKING DIAGRAM 16 NCP1901G AWLYWW 1 20 NCP1901 AW...