Description: This combination IC integrates power factor correc...
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.
<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