FSEZ1317A: Primary-Side-Regulation PWM Controller with MOSFET Integrated with improved EMI performance

This third-generation Primary-Side-Regulation (PSR) and highly integrated PWM controller provides several features to enhance the performance of low-power flyback converters.The proprietary topology, TRUECURRENT®, of the FSEZ1317A enables precise CC regulation and simplified circuit design for battery-charger applications. A lower-cost, smaller, and lighter charger results, compared to conventional designs or a linear transformer.

To minimize standby power consumption, the proprietary green mode provides off-time modulation to linearly decrease PWM frequency under light-load conditions. Green mode assists the power supply in meeting power conservation requirements.

By using the FSEZ1317A, a charger can be implemented with few external components and minimized cost.

Features

• Low Standby Power Under 30mW
• High-Voltage Startup
• Few External Components
• Constant-Voltage (CV) and Constant-Current (CC) Control without Secondary-Feedback Circuitry
• Green-Mode: Linearly Decreasing PWM Frequency
• Fixed PWM Frequency at 50kHz with Frequency Hopping to Solve EMI Problem
• Cable Compensation in CV Mode
• Peak-Current-Mode Control in CV Mode
• Cycle-by-Cycle Current Limiting
• V_DD Over-Voltage Protection with Auto Restart
• V_DD Under-Voltage Lockout (UVLO)
• Gate Output Maximum Voltage Clamped at 15V
• Fixed Over-Temperature Protection with Auto Restart
• Available in the 7-Lead SOP Package

Application Notes