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.