Power chip

LP38691 Stable 500mA Low Dropout CMOS Linear Regulator with Ceramic Output Capacitors

The NCP1077A and NCP1077B products integrate a fixed frequency current mode controller with 700 V MOSFETs. It uses two different pin outputs of the very common PDIP™7 encapsulation, which provides a high degree 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 NCP1077A and NCP1077B 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 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. Input line voltage detection prevents severe runaway under low input voltage conditions (undervoltage) as well as over high input lines (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.

The NCP81075 is a high-performance dual-MOSFET (high-side and low-side) gate drive integrated circuit suitable for driving high-speed, high-voltage MOSFETs operating at voltages up to 180 V. The NCP81075 integrates a driver IC and a bootstrap diode with a drive capability up to 4A. High-side and low-side drivers are independently controlled with matched 3.5ns typical propagation delay. This driver is suitable for high voltage buck applications, isolated power supplies, 2-switch and active clamp forward converters. The device can also be used in solar optimizer and solar inverter applications. The part is available in SO8, 8-pin DFN and 10-pin DFN encapsulation and is fully specified from -40C to 140C.