Power chip

The NCP1076A and NCP1076B products integrate a fixed frequency current mode controller with 700 V MOSFETs. It has two different pin outputs, adopts very common PDIP™7 encapsulation, highly integrated, including soft start, frequency dithering, short circuit protection, skip cycle, maximum peak current set point, slope compensation and dynamic self-power supply ( No auxiliary winding required). Unlike other monolithic solutions, the NCP1076A and NCP1076B are noiseless: during normal load operation, the part switches at a usable frequency (65 or 100 kHz). When the demand for output power disappears, the IC automatically enters frequency foldback mode, providing excellent 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. AC input line voltage detection prevents severe runaway under low input voltage conditions (brownout) as well as over high input line (AC line overvoltage protection). This also enables the overpower protection to compensate for any internal delays at high input voltage conditions, optimizing the maximum output current capability. 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.

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.

Current Mode Push-Pull PWM with Programmable Slope Compensation, 3.5ms Soft-Start, 12.5/8.3 UVLO, -40°C to 85°C

Programmable Off-Line PWM Controller 18-PDIP -40 to 85