The STMicroelectronics L6562D is a highly integrated power supply controller designed for use in offline switch-mode power supplies (SMPS). It is particularly well-suited for applications requiring high efficiency, compact design, and robust performance. The L6562D is commonly used in various applications, including adapters, chargers, and power supplies for consumer electronics, industrial equipment, and telecommunications.

## Key Features

1. High Voltage Start-Up: The L6562D can operate directly from the AC mains voltage, featuring a high-voltage start-up capability that allows it to initiate operation without the need for an external start-up resistor. This simplifies the design and reduces component count.

2. PWM Control: The device employs a pulse-width modulation (PWM) control scheme, which enables efficient regulation of output voltage and current. This control method minimizes power losses and improves overall efficiency, making it ideal for energy-sensitive applications.

3. Integrated High-Voltage Startup Circuit: The L6562D includes an integrated high-voltage startup circuit that allows for quick and efficient startup, reducing the need for additional components and enhancing reliability.

4. Frequency Jittering: The controller incorporates frequency jittering to minimize electromagnetic interference (EMI) and improve the overall performance of the power supply. This feature helps to spread the energy of the switching frequency over a wider spectrum, reducing peak emissions.

5. Over-Voltage Protection (OVP): The L6562D includes built-in over-voltage protection, which safeguards the power supply and connected loads from voltage spikes and surges. This feature is critical for ensuring the longevity and reliability of the system.

6. Under-Voltage Lockout (UVLO): The device features under-voltage lockout to prevent operation when the supply voltage is below a certain threshold, ensuring safe and reliable operation under varying conditions.

7. Thermal Shutdown: The L6562D is equipped with thermal shutdown protection, which disables the device in the event of overheating, thereby preventing damage to the circuit and ensuring safe operation.

8. Compact Package: The L6562D is available in a compact package, such as the SOIC-8, making it suitable for space-constrained applications.

## Specifications

- Supply Voltage (VCC): 10V to 30V
- Startup Voltage: 30V (typical)
- Operating Frequency: 65 kHz (fixed frequency)
- Maximum Duty Cycle: 70% (typical)
- Over-Voltage Protection (OVP) Threshold: Adjustable
- Under-Voltage Lockout (UVLO) Threshold: Adjustable
- Thermal Shutdown Temperature: 150°C (typical)
- Output Voltage Regulation: ±5% (typical)
- Package Type: Available in SOIC-8 and other compact packages.

## Applications

The L6562D is widely used in various applications, including:

- AC-DC Power Supplies: Ideal for designing efficient AC-DC converters for consumer electronics, such as televisions, computers, and chargers.
- Industrial Power Supplies: Suitable for power supplies used in industrial automation and control systems, where reliability and efficiency are paramount.
- Telecommunications Equipment: Employed in power supplies for telecom devices, ensuring reliable operation under varying load conditions.
- LED Drivers: Can be utilized in LED driver circuits for lighting applications, providing efficient power conversion and regulation.

## Conclusion

The STMicroelectronics L6562D is a versatile and efficient power supply controller that offers a range of features designed to enhance performance and reliability in offline switch-mode power supplies. Its high voltage capability, integrated protection features, and compact design make it an excellent choice for engineers looking to develop efficient power solutions for a variety of applications. For detailed information, including application notes and design resources, it is advisable to refer to the official STMicroelectronics documentation and datasheets.