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The L6565D is a current-mode primary controller IC manufactured by STMicroelectronics. Below are the factual details about its specifications, descriptions, and features:

Specifications:

• Input Voltage Range (VCC): 8.5V to 22V
• Operating Frequency: Up to 300 kHz
• Maximum Duty Cycle: 50% (internally fixed)
• Quiescent Current (Typical): 3.5 mA
• Start-up Current (Typical): 50 µA
• Output Drive Current (Peak): 600 mA (source/sink)
• Protection Features: Overvoltage protection (OVP), brownout protection, overload protection (OLP), and latch-off on fault conditions
• Operating Temperature Range: -40°C to +150°C
• Package: SO-8

Description:

The L6565D is a high-performance PWM controller designed for offline flyback converters in quasi-resonant (QR) operation. It is optimized for efficiency in power supplies, particularly in applications requiring low standby power consumption. The IC integrates multiple protection features and operates in transition mode (TM) for improved efficiency.

Features:

• Quasi-Resonant Operation: Reduces switching losses and improves efficiency.
• Current-Mode Control: Ensures stable operation with fast dynamic response.
• Adjustable Frequency Jittering: Reduces EMI emissions.
• Line Feedforward Compensation: Improves input voltage regulation.
• Soft-Start Function: Minimizes inrush current at startup.
• Latched or Auto-Recovery Protection: Configurable fault response.
• Low Standby Power Consumption: Suitable for energy-efficient designs.

This information is based on the manufacturer's datasheet for the L6565D from STMicroelectronics.