NCP1343 Series

Quasi-Resonant Flyback Controller with Power Excursion Mode

Catalog

Quasi-Resonant Flyback Controller with Power Excursion Mode

Part	Package / Case	Package / Case	Package / Case [x]	Package / Case [y]	Topology	Output Isolation	Control Features	Voltage - Start Up	Fault Protection	Mounting Type	Supplier Device Package	Internal Switch(s)	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Operating Temperature [Min]	Operating Temperature [Max]	Frequency - Switching	Duty Cycle	Voltage - Breakdown
ON Semiconductor NCP1343BADBDEAD1R2G	10-SOP	9 PC Pad	0.154 in	3.9 mm	Flyback	Isolated	EN Soft Start	17 V	Current Limiting Over Load Over Temperature Over Voltage Short Circuit	Surface Mount	9-SOIC		28 V	9 V	-40 °C	125 ¯C	500 kHz
ON Semiconductor NCP1343ENAAEBBD1R2G	10-SOP	9 PC Pad	0.154 in	3.9 mm	Flyback	Isolated	Frequency Control Soft Start	17 V	Current Limiting Over Load Over Temperature Over Voltage Short Circuit	Surface Mount	9-SOIC		28 V	9 V	-40 °C	125 ¯C	500 kHz	75 %	700 V

Catalog

Quasi-Resonant Flyback Controller with Power Excursion Mode

Key Features

• Power Excursion Mode (PEM)

• Minimum Peak Current Modulation for Rapid Frequency Foldback (RFF)

• Integrated HV Startup with Brownout Protection

• Valley Switching Operation with Valley Lockout

• Quiet-Skip Technology

Description

The NCP1343 is a highly integrated quasi−resonant flyback controller suitable for designing high−performance off−line power converters. It features a proprietary valley−lockout circuitry, ensuring stable valley switching. This system works down to the 6th valley and transitions to frequency foldback mode to reduce switching losses. As the load decreases further, the NCP1343 enters quiet−skip mode to manage the power delivery while minimizing acoustic noise. Additionally, the NCP1343 integrates power excursion mode (PEM) to minimize transformer size in designs requiring high transient load capability.