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L6565 IC – (SMD Package) – Quasi-Resonant SMPS Controller IC

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Description

The L6565 is a Quasi-Resonant SMPS (Switched-Mode Power Supply) Controller IC produced by STMicroelectronics. It is designed to drive power supplies that require high efficiency and low electromagnetic interference (EMI). The quasi-resonant topology (QR) enables efficient operation at high frequencies, making the L6565 ideal for designing power supplies that need to operate with low losses and reduced electromagnetic noise.

Features

  • Quasi-Resonant Operation: Minimizes switching losses and reduces EMI by utilizing a quasi-resonant approach, where the switch transitions occur at zero voltage (ZVS) or near zero voltage (ZVZCS) conditions.
  • Integrated MOSFET Driver: Includes a high-voltage MOSFET driver, simplifying the design and reducing the need for external components.
  • Flexible PWM Control: Offers Pulse Width Modulation (PWM) control to adjust the duty cycle, enabling efficient regulation of the output voltage.
  • Adjustable Switching Frequency: The IC can operate at a wide range of switching frequencies, depending on the application requirements.
  • Low Start-Up Current: Designed for low power consumption during the start-up phase, improving overall energy efficiency.
  • Integrated Protection Features: Includes built-in protection mechanisms like overvoltage, overcurrent, and thermal shutdown, providing increased reliability and safety for the power supply.
  • High Efficiency: The quasi-resonant operation significantly improves efficiency by reducing switching losses compared to traditional hard-switching controllers.
  • SMD Package: Available in a Surface-Mount Device (SMD) package, making it easy to integrate into compact PCB designs.

Specifications

Electrical Characteristics
  • Input Voltage Range: Typically 90V to 265V AC (to cover universal input voltage ranges).
  • Output Voltage Range: The output voltage is regulated based on the application requirements, typically from 5V to 24V or higher.
  • Switching Frequency: Adjustable switching frequency typically from 50 kHz to 500 kHz depending on external components (e.g., resonant tank).
  • Low Start-Up Current: Typically 10 µA, ensuring minimal energy consumption during the start-up phase.
  • Power Efficiency: High efficiency, typically 85% to 90% depending on the application.
  • Output Regulation: Provides stable and regulated output voltage with low ripple, using a feedback mechanism.
  • Overload Protection: Built-in protection for overcurrent, overvoltage, and thermal shutdown.
Protection Features
  • Overcurrent Protection (OCP): Prevents excessive current flow that could damage components or cause thermal runaway.
  • Overvoltage Protection (OVP): Shuts down the regulator or reduces output voltage when the output exceeds safe limits.
  • Thermal Shutdown: Protects the IC from overheating by disabling operation or reducing output during thermal stress.
  • Undervoltage Lockout (UVLO): Ensures that the IC operates only when the input voltage is within the correct range.
  • Soft-Start Function: Minimizes inrush current during power-up by gradually increasing the output voltage, reducing the stress on components.

Note

* Product Images are shown for illustrative purposes only and may differ from actual product

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