L6563TR Integrated Circuits (ICs)

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The STMicroelectronics L6563TR is an advanced peak current mode controller designed for limited power factor correction (PFC) applications, including SMPSs with synchronous rectification. The device is designed to operate in any application that requires AC/DC power conversion. It features an integrated galvanically-isolated TRIAC dimming controller, a comparison voltage generator, and a fault protection system.

The primary application of the L6563TR is in the majority of power supplies that require PFC such as switch-mode power supplies (SMPSs) for X-ray and medical systems, broad band power amplifiers, power supplies for industrial applications, lighting ballast controllers and smart power systems. Its other advantages include low stand-by power, high efficiency and low total harmonic distortion (THD).

The device offers a single three-phase operation and the possibility of implementing a maximum peak current mode control PFC. The L6563TR operates in primary-side control PFC or boundary conduction mode (BCM) which requires only a single current transformer. It combines an optimized PFC control loop with an autonomous extended dimming control loop in order to form a closed loop system. The L6563TR contains an innovative pulse-width demodulation (PWD) technique for measuring the voltage at the rectifier bridge, providing for an enhanced steady-state accuracy.

The L6563TR\'s operating principle is based on its current loop system. The internal error amplifier compares the average output voltage of the power supply to the reference voltage, then outputs a current to the primary side of the power transformer. The magnitude of the current is proportional to the error voltage and adjusts the PFC converter output voltage to the desired level. Furthermore, the controller derives two reference of half rectified full wave voltage waveforms, referenced to the AC line, to generate two monotonically decreasing current references that can drive it and ensure proper operating conditions are met. This current reference is compared with the current cmd and the difference is amplified by VAC. The output of the current loop is the command signal VQ which is compared to the voltage AQ to generate the starting angle θ of the synchronous rectification cycle.

The TRIAC dimming controller enables smooth dimming control and current-source driving of the TRIAC. The dimming controller can detect the TRIAC turn-on instant with better accuracy than traditional zero-crossing circuits. The maximum conduction current through the TRIAC is limited to achieve a soft dimming effect from the TRIAC

The main advantages of the L6563TR are high efficiency, low total harmonic distortion, fast startup and shutdown, high precision peak current control and a wide range of operating power ranges. The device\'s small form factor, integrated galvanically-isolated TRIAC dimming controller and comparison voltage generator, and fault protection system are beneficial as well.

Overall, the STMicroelectronics L6563TR is an advanced peak current mode controller designed for limited power factor correction (PFC) applications. Its primary application is in the majority of power supplies that require PFC such as switch-mode power supplies (SMPSs) and it features high efficiency, low total harmonic distortion (THD), fast startup and shutdown, and high precision peak current control. Finally, it has a wide range of operating power ranges, a small form factor, an integrated galvanically-isolated TRIAC dimming controller and comparison voltage generator, and a fault protection system.

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