Overview
The L6562AT is a current-mode Power Factor Correction (PFC) controller operating in Transition Mode (TM), designed and manufactured by STMicroelectronics. It retains the same pin-out as its predecessors, the L6561 and L6562, but offers improved performance. The device features a highly linear multiplier that reduces AC input current distortion, allowing for wide-range-mains operation with extremely low Total Harmonic Distortion (THD) even over a large load range. The output voltage is controlled using a voltage-mode error amplifier and an accurate internal voltage reference. The L6562AT is known for its low power consumption and includes a disable function for remote ON/OFF control, making it compliant with various energy-saving standards such as Blue Angel, EnergyStar, and Energy2000.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (Operating Range) | 10.5 - 22.5 | V |
| Turn-on Threshold | 11.7 - 13.3 | V |
| Turn-off Threshold | 9.5 - 10.5 | V |
| Start-up Current | 30 - 60 | µA |
| Quiescent Current | 2.5 - 3.9 | mA |
| Operating Supply Current | 3.5 - 5.5 | mA |
| Output Totem Pole Peak Current | -600/+800 | mA |
| Junction Temperature Operating Range | -40 to 150 | °C |
| Storage Temperature | -55 to 150 | °C |
Key Features
- Proprietary multiplier design for minimum THD
- Very accurate adjustable output overvoltage protection
- Ultra-low (30 µA) start-up current and low (2.5 mA) quiescent current
- Digital leading-edge blanking on current sense
- Disable function on E/A input for remote ON/OFF control
- 1% (@ TJ = 25 °C) internal reference voltage
- -600/+800 mA totem pole gate driver with active pull-down during UVLO and voltage clamp
- DIP-8/SO-8 packages
- Guaranteed for extreme temperature range (outdoor)
Applications
- PFC pre-regulators for IEC61000-3-2 compliant SMPS (e.g., flat TVs, monitors, desktop PCs, games)
- Street lighting applications
- Electronic ballast
Q & A
- What is the primary function of the L6562AT?
The L6562AT is a current-mode Power Factor Correction (PFC) controller operating in Transition Mode (TM).
- What are the key benefits of the proprietary multiplier design in the L6562AT?
The proprietary multiplier design reduces AC input current distortion, allowing for wide-range-mains operation with extremely low THD.
- What is the significance of the ultra-low start-up current in the L6562AT?
The ultra-low start-up current (30 µA) helps in reducing power consumption before the device turns on.
- How does the disable function on the E/A input work?
The disable function allows for remote ON/OFF control, making it easier to comply with energy-saving requirements.
- What is the role of the totem pole gate driver in the L6562AT?
The totem pole gate driver, capable of -600/+800 mA, is suitable for driving high current MOSFETs or IGBTs.
- What are the typical applications of the L6562AT?
Typical applications include PFC pre-regulators for IEC61000-3-2 compliant SMPS, street lighting, and electronic ballast.
- What are the package options available for the L6562AT?
The L6562AT is available in DIP-8 and SO-8 packages.
- How does the L6562AT handle overvoltages?
The device features an effective two-step overvoltage protection (OVP) to safely handle overvoltages during start-up or load disconnection.
- What is the internal reference voltage accuracy of the L6562AT?
The internal reference voltage has an accuracy of 1% at TJ = 25 °C.
- How does the L6562AT optimize THD?
The device includes a circuit that artificially increases the ON-time of the power switch near the line voltage zero-crossings, minimizing THD.
