Overview
The L6562ATD, produced by STMicroelectronics, is a current-mode Power Factor Correction (PFC) controller operating in Transition Mode (TM). This device is pin-to-pin compatible with its predecessors, the L6561 and L6562, and offers improved performance. It is designed to enhance the efficiency and compliance of power supply systems, particularly in applications requiring high power factor and low total harmonic distortion (THD).
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 10.3 | - | 22 | V |
| Start-up Current | - | - | 70 µA | - |
| Quiescent Current | - | - | 4 mA | - |
| Operating Temperature Range | -40 | - | 150 | °C |
| Gate Driver Output Current | -600 | - | +800 | mA |
| Internal Reference Voltage | 2.465 | 2.5 | 2.535 | V |
| Package Style | - | - | SO-8, DIP-8 | - |
Key Features
- Realised in BCD Technology
- Transition-Mode Control of PFC Pre-regulators
- Proprietary Multiplier design for minimum THD of AC input Current
- Very Precise Adjustable output overvoltage Protection
- Ultra-Low (≤70 µA) Start-up Current and Low (≤4 mA) Quiescent Current
- Extended IC Supply Voltage Range
- On-chip Filter on Current Sense
- Disable Function for remote ON/OFF control
- 1% (@ Tj = 25 °C) Internal Reference Voltage
- Totem-pole Gate Driver with UVLO Pull-down and Voltage Clamp
Applications
- PFC Pre-regulators for IEC61000-3-2 compliant SMPS (TV, Desktop PC, Monitor) up to 300W
- High-end AC-DC Adapters/Chargers
- Entry-level Server and Web Server power supplies
Q & A
- What is the operating mode of the L6562ATD?
The L6562ATD operates in Transition Mode (TM) as a current-mode PFC controller.
- What are the key benefits of the proprietary multiplier design in the L6562ATD?
The proprietary multiplier design minimizes the THD of the AC input current, allowing for wide-range-mains operation with extremely low THD.
- What is the typical quiescent current of the L6562ATD?
The quiescent current is typically ≤4 mA.
- What is the maximum supply voltage for the L6562ATD?
The maximum supply voltage is 22 V.
- What types of packages are available for the L6562ATD?
The device is available in SO-8 and DIP-8 packages.
- How does the L6562ATD handle overvoltages?
The device features a two-step overvoltage protection (OVP) mechanism to safely handle overvoltages during start-up or load disconnection.
- What is the purpose of the on-chip filter on the current sense input?
The on-chip filter helps in reducing noise and improving the accuracy of the current sensing.
- What are the typical applications of the L6562ATD?
Typical applications include PFC pre-regulators for IEC61000-3-2 compliant SMPS, high-end AC-DC adapters/chargers, and entry-level server and web server power supplies.
- How does the L6562ATD optimize THD near the zero-crossings of the line voltage?
The device includes a special circuit that forces the PFC pre-regulator to process more energy near the line voltage zero-crossings, reducing the conduction dead-angle and thus minimizing THD.
- What is the significance of the internal reference voltage in the L6562ATD?
The internal reference voltage is precise (1% @ Tj = 25 °C), which helps in maintaining stable output voltage control.
