Overview
The L6563ATR from STMicroelectronics is an advanced transition-mode Power Factor Correction (PFC) controller. It operates in Transition Mode (TM) and is based on the core of a standard TM PFC controller, offering improved performance and additional functionalities. 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 using a voltage-mode error amplifier and a precise internal voltage reference, with stability enhanced by a voltage feedforward function (1/V2 correction).
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (Vcc) | 10.3 | 22 | - | V |
| Turn-on Threshold (VccOn) | 11 | 12 | 13 | V |
| Turn-off Threshold (VccOff) | 8.7 | 9.5 | 10.3 | V |
| Hysteresis (Hys) | 2.3 | 2.7 | - | V |
| Start-up Current (Istart-up) | 50 | 90 | - | µA |
| Quiescent Current (Iq) | 3 | 5 | - | mA |
| Internal Reference Voltage Accuracy | - | 1.5% @ TJ = 25°C | - | % |
| Gate Driver Current (IGD) | -600/+800 | - | - | mA |
| Package | - | - | SO-14 | - |
Key Features
- Very precise adjustable output overvoltage protection and protection against feedback loop failure (latched shutdown).
- Tracking boost function to change the output voltage proportionally to the mains voltage.
- Interface for cascaded converter's PWM controller to stop the operation in case of anomalous conditions.
- Input voltage feedforward (1/V2) to improve loop stability and transient response.
- Inductor saturation detection (L6563 only).
- Remote ON/OFF control.
- Low start-up current (≤90 µA) and low quiescent current (≤5 mA).
- Totem-pole gate driver with active pull-down during UVLO, capable of 600 mA source and 800 mA sink current.
Applications
- PFC pre-regulators for high-end AC-DC adapters/chargers.
- Desktop PCs, servers, and web servers.
- IEC61000-3-2 or JEIDA-MITI compliant SMPS, in excess of 350W.
Q & A
- What is the primary function of the L6563ATR?
The L6563ATR is a current-mode Power Factor Correction (PFC) controller operating in Transition Mode (TM).
- What is the significance of the voltage feedforward function in the L6563ATR?
The voltage feedforward function (1/V2 correction) improves the stability of the loop and the transient response to sudden mains voltage changes.
- How does the tracking boost function work in the L6563ATR?
The tracking boost function allows the output voltage to be changed proportionally to the mains voltage, using the TBO pin to define the current that is sunk from the INV pin.
- What is the purpose of the inductor saturation detection feature in the L6563ATR?
The inductor saturation detection feature (available only in the L6563) stops the PFC stage in case the boost inductor saturates, enhancing safety and reliability).
- How does the remote ON/OFF control work in the L6563ATR?
The device includes disable functions suitable for remote ON/OFF control, both in master and slave configurations, using the RUN and PFC_OK pins).
- What are the key specifications of the gate driver in the L6563ATR?
The gate driver is a totem-pole output stage capable of 600 mA source and 800 mA sink current, with active pull-down during UVLO).
- What is the typical quiescent current of the L6563ATR?
The typical quiescent current is 5 mA after turn-on).
- What is the accuracy of the internal reference voltage in the L6563ATR?
The internal reference voltage accuracy is 1.5% at TJ = 25°C).
- In what package is the L6563ATR available?
The L6563ATR is available in an SO-14 package).
- What are some common applications of the L6563ATR?
