STMicroelectronics L6564TDTR - PFC Controller IC

The L6564TDTR from STMicroelectronics is a highly integrated Power Factor Correction (PFC) controller IC, specifically designed for use in boost pre-regulator circuits. This advanced controller is part of the L656x family and is intended for applications within the realm of switch-mode power supplies (SMPS), such as those found in televisions, monitors, servers, and high-efficiency power adapters.

Utilizing a proprietary multi-mode operation called Transition Mode (TM), the L6564TDTR is capable of delivering optimal efficiency across a wide range of load conditions. This is achieved by seamlessly transitioning between different operational modes, such as DCM (Discontinuous Conduction Mode) at light loads, CCM (Continuous Conduction Mode) at heavy loads, and a special CRM (Critical Conduction Mode) that helps to minimize the switching losses and maximize efficiency.

One of the standout features of this controller is its ability to provide near-unity power factor correction. This is essential for meeting the stringent regulatory requirements for harmonic correction in AC-DC converters. The L6564TDTR ensures that energy is used efficiently, reducing waste and saving costs in the long term. Additionally, the IC incorporates an extremely precise adjustable output overvoltage protection, safeguarding the system from potentially damaging voltage spikes.

The L6564TDTR also boasts a low (<70µA) start-up current and a very low (<4mA) quiescent current, which further enhances its efficiency profile. Its integrated high-voltage startup source ensures a quick and reliable start, while the totem-pole output stage, capable of driving a power MOSFET or IGBT, is designed to provide high current capability with minimal delay.

For design flexibility, the L6564TDTR comes in a compact SO-8 package and offers a range of features such as an enable function, a current sense filter, and protections against feedback loop failure, overcurrent, and overvoltage. All these features make the L6564TDTR an excellent choice for designers looking to create power supplies with high efficiency, low THD (Total Harmonic Distortion), and robust protection features.