STMicroelectronics L6566B Multi-Mode Controller

The L6566B is a versatile and advanced multi-mode controller designed by STMicroelectronics, tailored for high-performance switch-mode power supplies (SMPS). This state-of-the-art controller is particularly suitable for applications such as adapters, LCD and PDP TV sets, and all SMPS up to a few hundred watts. The L6566B stands out with its ability to drive both low-side and high-side MOSFETs, providing design flexibility and efficiency.

One of the key features of the L6566B is its multi-mode operation, which includes quasi-resonant (QR) Zero-Voltage Switching (ZVS) at high power levels, and transition-mode (TM) at lower power levels. This capability allows for optimal efficiency across a wide range of loads, which is crucial for energy-saving applications and compliance with energy efficiency standards such as Energy Star or the European Code of Conduct (CoC).

The controller integrates a high-voltage startup circuit that ensures a reliable start-up sequence and reduces the number of external components required. Moreover, the L6566B provides several protection features to enhance system reliability. These include over-voltage, over-load, and over-temperature protections, as well as a brownout detector and a programmable soft-start function to prevent inrush current during startup.

Another remarkable feature is the burst-mode operation, which enables the power supply to achieve very low input power consumption at no-load or light-load conditions, thus ensuring low standby power consumption. The L6566B also supports the implementation of power factor correction (PFC) circuits, either as a standalone PFC controller or in combination with a downstream PWM controller, to create a highly efficient PFC+PWM controller system.

For designers looking for a robust and efficient solution for their SMPS designs, the L6566B from STMicroelectronics offers a compelling blend of features, performance, and reliability. Its versatility and energy-saving capabilities make it an excellent choice for a wide range of power supply applications.