The NCP1340 is a highly integrated quasi−resonant flyback controller suitable for designing high−performance off−line power converters. With an integrated active X2 capacitor discharge feature, the NCP1340 can enable no−load power consumption below 30 mW. The quasi−resonant current−mode flyback stage features a proprietary valley−lockout circuitry, ensuring stable valley switching. This system works down to the 6th valley and transitions to a frequency foldback mode to reduce switching losses. As the load decreases further, the NCP1340 enters quiet−skip mode to manage the power delivery. To help ensure converter ruggedness, the NCP1340 implements several key protective features such as internal brownout detection, a non−dissipative Over Power Protection (OPP) for constant maximum output power regardless of input voltage, a latched over voltage and NTC−ready over temperature protection through a dedicated pin, and line removal detection to safely discharge the X2 capacitors when the line is removed.
●Features | | Benefits
●---|---|---
● | | | | |
● QR Frequency Jittering
●| |
● Reduces EMI Signature
● New Quiet-Skip Technology
●| |
● Ensures Operation Outside Audible Range
● Integrated HV Startup with Brownout Protection
●| |
● Provides an efficient power-on source and protects agaisnts drops in input mains voltage
● Valley Switching Operation with Valley Lockout
●| |
● Maximizing the efficiency over the entire power range
● Integrated X2 Capacitor Discharge Capability
●| |
● Eliminates the need for a X2 resistors
● NTC Compatible Fault Pin
●| |
● Extra protection against high temperature or other fault conditions
● High Drive Capability: -500 mA / +800 mA
●| |
● Enables faster switching of primary-side MOSFET
● Latch input for OVP and OTP implementations
●| |
● Simple implementation of required protection functions
