The NCP101X series integrates a fixed--frequency current--mode controller and a 700 V MOSFET. Housed in a PDIP--7, PDIP--7 Gull Wing, or SOT--223 package, the NCP101X offers everything needed to build a rugged and low--cost power supply, including soft--start, frequency jittering, short--circuit protection, skip--cycle, a maximum peak current setpoint and a Dynamic Self--Supply (no need for an auxiliary winding).
Unlike other monolithic solutions, the NCP101X is quiet by nature: during nominal load operation, the part switches at one of the available frequencies (65 -- 100 -- 130 kHz). When the current setpoint falls below a given value, e.g. the output power demand diminishes, the IC automatically enters the so--called skip--cycle mode and provides excellent efficiency at light loads. Because this occurs at typically 1/4 of the maximum peak value, no acoustic noise takes place. As a result, standby power is reduced to the minimum without acoustic noise generation.

FEATUREs
• Built--in 700 V MOSFET with Typical RDSon of 11 Ω and 22 Ω
• Large Creepage Distance Between High--Voltage Pins
• Current--Mode Fixed Frequency Operation: 65 kHz – 100 kHz -- 130 kHz
• Skip--Cycle Operation at Low Peak Currents Only: No Acoustic Noise!
• Dynamic Self--Supply, No Need for an Auxiliary Winding
• Internal 1.0 ms Soft--Start
• Latched Overvoltage Protection with Auxiliary Winding Operation
• Frequency Jittering for Better EMI Signature
• Auto--Recovery Internal Output Short--Circuit Protection
• Below 100 mW Standby Power if Auxiliary Winding is Used
• Internal Temperature Shutdown
• Direct Optocoupler Connection
• SPICE Models Available for TRANsient Analysis
• These are Pb--Free and Halide--Free Devices

Typical Applications
• Low Power AC/DC Adapters for Chargers
• Auxiliary Power Supplies (USB, Appliances,TVs, etc.)