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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 11Ω and 22Ω

? 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

? Pb?Free Packages are Available*

Typical Applications

? Low Power AC/DC Adapters for Chargers

? Auxiliary Power Supplies (USB, Appliances, TVs, etc.)