Overview
The L6563S is a current-mode Power Factor Correction (PFC) controller designed by STMicroelectronics, operating in transition mode (TM). It offers improved performance and additional functions compared to its predecessor, the L6563. The device features a highly linear multiplier and a special correction circuit that reduces crossover distortion of the mains current, enabling wide-range-mains operation with extremely low Total Harmonic Distortion (THD) even over a large load range. The output voltage is controlled by a voltage-mode error amplifier and an accurate internal voltage reference. The IC also includes various protection functions and interface capabilities for cascaded converters, making it suitable for high-power applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| IC Supply Voltage (Vcc) | 10.3 to 22.5 | V |
| Turn-on Threshold (VccOn) | 11 to 13 | V |
| Turn-off Threshold (VccOff) | 8.7 to 10.3 | V |
| Internal Reference Voltage Accuracy | 1% @ TJ = 25 °C | % |
| Start-up Current (Istart-up) | ≤ 100 µA | µA |
| Operating Bias Current | ≤ 6 mA | mA |
| Gate Driver Current | -600/+800 mA | mA |
| Junction Temperature Operating Range | -40 to 150 | °C |
| Storage Temperature | -55 to 150 | °C |
| Package | SO14 | - |
Key Features
- Tracking boost function to adjust output voltage based on mains voltage.
- Fast bidirectional input voltage feedforward (1/V2 correction) for improved line transient response.
- Interface for cascaded converter's PWM controller.
- Remote ON/OFF control capability.
- Accurate adjustable output overvoltage protection.
- Protection against feedback loop disconnection and boost inductor saturation.
- Low start-up current (≤ 100 µA) and low operating bias current (≤ 6 mA).
- Highly linear multiplier for reduced THD.
- Totem-pole gate driver with active pull-down during UVLO.
Applications
- PFC pre-regulators for high-end AC-DC adapters and chargers.
- Desktop PCs, servers, and web servers.
- IEC61000-3-2 or JEITA-MITI compliant SMPS, exceeding 400 W.
- ATX power supplies and flat screen displays.
Q & A
- What is the primary function of the L6563S?
The L6563S is a current-mode Power Factor Correction (PFC) controller operating in transition mode (TM).
- What are the key improvements over its predecessor, the L6563?
The L6563S offers improved performance, additional functions, and enhanced protection features.
- What is the significance of the tracking boost function?
The tracking boost function allows the output voltage to be adjusted based on the mains voltage, enhancing flexibility in power supply design.
- How does the L6563S handle feedback loop failures?
The device includes protection against feedback loop disconnection, which can latch the device off in case of a failure.
- What is the purpose of the remote ON/OFF control feature?
The remote ON/OFF control allows the device to be shut down or restarted remotely, useful for system management and energy saving.
- What are the thermal specifications of the L6563S?
The junction temperature operating range is -40 to 150 °C, and the storage temperature range is -55 to 150 °C.
- How does the L6563S interface with downstream converters?
The device provides an interface with the PWM controller of the DC-DC converter to manage operation and protection functions.
- What is the maximum power handling capability of the L6563S?
The L6563S can handle up to 400 W and can be extended to 450 W with appropriate airflow.
- What protection features does the L6563S include?
The device includes overvoltage protection, feedback loop failure protection, and boost inductor saturation protection.
- What is the package type of the L6563S?
The L6563S is available in an SO14 package.
