Power chip

The NCV1072/NCP1075 products integrate a fixed frequency current mode controller with 670 V MOSFETs. Using PDIP-7 or SOT-223 encapsulation, the NCV1072/5 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). Unlike other monolithic solutions, the NCV1072/5 are noise-free: during normal load operation, when switching 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 low 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.

The NCP1365 offers a novel approach to output power levels of a few watts above 20 W in general power supply flyback applications. Thanks to a new approach, this new controller eliminates the need for an auxiliary feedback circuit (typically an optocoupler and TL431 reference) while achieving excellent line and load regulation. The NCP1365 operates in a valley-lock quasi-resonant peak current control mode at high loads to provide high energy efficiency. When auxiliary side power starts to disappear, the controller will automatically adjust the duty cycle, then at lower loads, the controller goes into pulse frequency modulation with a fixed peak current via valley switching survey. This technique allows output regulation to be maintained under small dummy loads. Valley lockout in the first 4 valleys prevents valley skipping operation, then solid switching at lower loads provides high energy efficiency.

Low Power Economical BiCMOS Current Mode PWM 8-TSSOP -40 to 85

BiCMOS PFC/PWM Combo Controller 20-SOIC -40 to 85

Buck - Switching Regulator - IC - Positive or Negative - Adjustable (Programmable) - 0.8V (1.8V-3.3V-5V) - 1 - Output - 500mA - 16-WFDFN - Exposed Pad