QUASI-RESONANT SMPS CONTROLLER The L6565 is a current-mode primary controller IC manufactured by STMicroelectronics. Below are the factual specifications, descriptions, and features from Ic-phoenix technical data files:
### **Manufacturer:**
STMicroelectronics
### **Specifications:**
- **Input Voltage Range (VCC):** 8.5V to 21V
- **Operating Frequency:** Adjustable up to 300kHz
- **Maximum Duty Cycle:** 50% (internally fixed)
- **Start-up Current:** Typically 50µA
- **Quiescent Current:** Typically 2.5mA
- **Output Drive Capability:** ±400mA (source/sink)
- **Protection Features:**
- Overvoltage protection (OVP)
- Undervoltage lockout (UVLO)
- Overcurrent protection (OCP)
- Latch-off on overload
- **Operating Temperature Range:** -40°C to +125°C
- **Package Options:** SO-8
### **Descriptions:**
The L6565 is a high-performance current-mode PWM controller designed for offline flyback converters. It is optimized for quasi-resonant (QR) operation, improving efficiency by enabling zero-voltage switching (ZVS). The IC includes advanced features for power supply control, such as frequency modulation for reduced EMI and precise power regulation.
### **Features:**
- **Quasi-Resonant Operation:** Enables zero-voltage switching for improved efficiency.
- **Current-Mode Control:** Ensures cycle-by-cycle current limiting.
- **Adjustable Frequency:** Up to 300kHz for flexible design.
- **Line Feedforward Compensation:** Improves input voltage regulation.
- **Soft-Start Function:** Reduces inrush current at startup.
- **Latched Shutdown:** Protects against overloads and faults.
- **Low Power Consumption:** Optimized for energy-efficient applications.
This information is based on the manufacturer's datasheet and technical documentation.
