Overview
The L6563H is a current-mode Power Factor Correction (PFC) controller from STMicroelectronics, operating in Transition Mode (TM). It incorporates the same features as the L6563S with the additional benefit of a high voltage start-up source. This IC is particularly suited for applications that must comply with energy-saving regulations and where the PFC pre-regulator acts as the master stage.
The device features a highly linear multiplier and a special correction circuit that reduces crossover distortion of the mains current, allowing for 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, with loop stability optimized by a proprietary voltage feedforward function.
Key Specifications
| Parameter | Min | |||
|---|---|---|---|---|
| Supply Voltage (Vcc) | 10.3 | 12 | 22 | V |
| Turn-on Threshold (VccOn) | 11 | 12 | 13 | V |
| Turn-off Threshold (VccOff) | 8.7 | 9.5 | 10.3 | V |
| Hysteresis | 2.3 | 2.7 | V | |
| Start-up Current (Istart-up) | 50 | 90 | µA | |
| Quiescent Current (Iq) | 3 | 5 | mA | |
| Internal Reference Voltage Accuracy | 1% | % (at TJ = 25 °C) | ||
| Gate Driver Current | -600 | +800 | mA | |
| Junction Temperature Range | -40 | 150 | °C | |
| Storage Temperature Range | -55 | 150 | °C |
Key Features
- On-board 700 V start-up source
- Tracking boost function
- Fast “bidirectional” input voltage feedforward (1/V2 correction)
- Interface for cascaded converter's PWM controller
- Remote ON/OFF control
- Accurate adjustable output overvoltage protection
- Protection against feedback loop disconnection (latched shutdown)
- Inductor saturation protection
- Low (≤ 100 µA) start-up current
- 6 mA max. operating bias current
- 1% (at TJ = 25 °C) internal reference voltage
- -600/+800 mA totem pole gate driver with active pull-down during UVLO
Applications
- PFC pre-regulators for high-end AC-DC adapters/chargers
- Desktop PCs, servers, and web servers
- IEC61000-3-2 or JEITA-MITI compliant Switch-Mode Power Supplies (SMPS) exceeding 400 W
- SMPS for LED luminaires
Q & A
- What is the primary function of the L6563H?
The L6563H is a current-mode Power Factor Correction (PFC) controller operating in Transition Mode (TM).
- What is the significance of the high voltage start-up source in the L6563H?
The high voltage start-up source allows the IC to start up directly from the rectified mains voltage, making it suitable for applications requiring high voltage start-up.
- How does the L6563H achieve low THD?
The L6563H uses a highly linear multiplier and a special correction circuit to reduce crossover distortion of the mains current, resulting in extremely low THD.
- What is the purpose of the voltage feedforward function in the L6563H?
The voltage feedforward function (1/V2 correction) improves the loop stability and transient response to sudden mains voltage changes.
- How does the tracking boost function work?
The tracking boost function allows the output voltage to change in accordance with the mains voltage.
- What protections are included in the L6563H?
The IC includes protections such as overvoltage protection, feedback loop failure protection, inductor saturation protection, and brownout protection.
- How does the remote ON/OFF control work?
The remote ON/OFF control is managed through the PFC_OK pin, allowing the IC to be shut down or restarted based on external signals.
- What is the maximum operating temperature of the L6563H?
The junction temperature operating range is from -40 °C to 150 °C.
- What is the package type of the L6563H?
The L6563H is available in an SO-16 package.
- What are some typical applications of the L6563H?
Typical applications include PFC pre-regulators for high-end AC-DC adapters/chargers, desktop PCs, servers, and SMPS for LED luminaires.
