This combination IC integrates power factor correction (PFC) and quasi-resonant flyback functionality necessary to implement a compact and highly efficient Switched Mode Power Supply for an adapter application.The PFC stage exhibits near-unity power factor while operating in a Critical Conduction Mode (CrM) with a maximum frequency clamp. The circuit incorporates all the features necessary for building a robust and compact PFC stage while minimizing the number of external components.The quasi-resonant current-mode flyback stage features a proprietary valley-lockout circuitry, ensuring stable valley switching. This system works down to the 4th valley and toggles to a frequency foldback mode with a minimum frequency clamp beyond the 4th valley to eliminate audible noise. Skip mode operation allows excellent efficiency in light load conditions while consuming very low standby power consumption.
●Features | | Benefits
●---|---|---
● | | | | |
● <10mW No Load Standby Performance
●| |
● Lowest no load performance
● High Voltage Startup Circuit and Active Input Filter Capacitor Discharge Circuitry
●| |
● Eliminates the need for an external HV startup circuit and X2 resistors.
● High Voltage Line Voltage Detector
●| |
● Optimize performance based on 110 v or 220 V ac mains
● Integrated High Voltage Switch Disconnects PFC Feedback Resistor Divider
●| |
● Reduces no load standby power
● Fault Input for Severe Fault Conditions
●| |
● Enhanced protection capability
● Bi-Level Line-Dependent Output Voltage
●| |
● Optimized system with different input voltages
● Boost Diode Short-Circuit Protection
●| |
● Enhanced protection features
● Adjustable PFC Disable Threshold Based on Output Power
●| |
● Optimized system to improve efficiency
● Frequency Foldback with Minimum Frequency Clamp
●| |
● Enhanced efficiency at light and no load
● Minimum Frequency Clamp
●| |
● Eliminates audible noise
● Valley Switching Operation with Valley-Lockout
●| |
● Noise free operation
●PFC
●| |
●QR Flyback Controller
●| |
