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.

UC3842B, UC3843B series are high performance fixed frequency current mode controllers. These devices are specifically designed for off-line and DC-DC converter applications, providing designers with a cost-effective solution with minimal external components. These ICs feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, a high gain error amplifier, a current sense comparator, and a high current totem pole output suitable for driving power MOSFETs. Additionally, protection features are included, including input and reference undervoltage lockouts each with hysteresis, cycle-by-cycle current limit, programmable output dead time, and a latch for single-pulse metering. These devices are available in 8-pin dual inline plug-in and surface mount (SO-8) plastic encapsulation and 14-pin plastic surface mount (SO-14) encapsulation. The SO-14 encapsulation has separate power and ground pins for the totem pole output stage. The UCX842B has a UVLO threshold of 16 V (on) and 10 V (off), making it ideal for offline converters. The UCX843B is designed for low-voltage applications with UVLO thresholds of 8.5 V (on) and 7.6 V (off).