Power chip

Product Overview The NCP1568 is a highly integrated AC-DC PWM controller for implementing an Active Clamp Flyback topology. The NCP1568 uses a proprietary frequency conversion algorithm to achieve zero-voltage switching (ZVS) of MOSFETs under various line and load conditions. The ZVS function enables high frequency operation, increasing the power density of the power converter while achieving high energy efficiency. Integrates a high-voltage start-up circuit, a powerful low-side driver, and a 5-V logic-level driver for active-clamp FETs, including SJ FETs and GaN FETs. The NCP1568 is suitable for a variety of applications including AC-DC adapters, industrial, telecom, lighting and other applications with important power density requirements.

The NCP1071 integrates a fixed frequency current mode controller and 700 V MOSFETs. Using PDIP-7 or SOT-223 encapsulation, the NCP1071 offers a high level of integration including soft-start, frequency dithering, short-circuit protection, cycle skipping, maximum peak current set point, slope compensation, and dynamic self-power supply (no auxiliary winding required) . Unlike other monolithic solutions, the NCP1071 is noiseless: during normal load operation, it switches at one of the available frequencies (65, 100, 130 kHz). When the demand for output power disappears, the IC will automatically enter frequency foldback mode, providing excellent energy efficiency at light loads. When power demand decreases further, it enters skip mode, reducing standby power consumption to no-load conditions. Protection features include: timers to detect overload or short circuit events, overvoltage protection with automatic recovery, and AC input line voltage detection. To improve standby performance, connecting an auxiliary winding stops DSS operation, helping to reduce input power consumption on the high line to less than 50 mW.