SZ1200 140W

The latest addition to Silanna’s family of CO₂ Smart Power™ technologies addresses the ultimate power management challenge facing engineers by simplifying design and improving performance while meeting environmental sustainability goals through more efficient energy use. 

The SZ1200 active clamp flyback (ACF) integrates adaptive digital PWM control with ultra-high-voltage (UHV) components comprising a 700 V primary GaN FET, X capacitor (X-Cap) discharge circuit, active clamp driver and start-up regulator.

It simplifies the design of high-efficiency, high-power-density power supplies, USB-PD/QC AC/DC adapters, and battery charging applications. It achieves this by combining the ease of use of a traditional flyback controller with the advantages of Active Clamp Flyback (ACF) technology.

Key benefits of the SZ1200 ACF controller:

• Improved efficiency: Recovers leakage inductance energy from the flyback transformer, reducing overall power loss.
• Reduced voltage stress: Limits primary FET drain voltage spikes during turn-off, improving reliability and component lifespan.
• Simplified design: Easier to implement compared to discrete ACF solutions, saving design time and effort.

Target applications:

• High-efficiency power supplies.
• High-power-density power supplies.
• USB-PD/QC AC/DC adapters.
• Battery chargers.

Overall, the SZ1200 ACF controller offers a compelling solution for engineers seeking to design high-performance power supplies with improved efficiency and simplified design.

• High-frequency ‘CO₂ Smart Power’ ACF controller
• Configurable high-switching-frequency operation (up to 250 kHz)
• Integrated 700 V GaN primary FET
• Integrated UHV X-cap discharge circuit, active clamp driver and start-up regulator
• Over 93% efficiency at low line
• Flat efficiency across universal input voltage (90 – 265 Vac) and loading conditions
• CCM for increased peak power delivery and better utilization of transformer core in universal input applications
• QR valley mode switching and boosting for low EMI and near-ZVS operation
• OptiMode™ cycle-by-cycle adaptive digital control
• Regulated burst-mode
• Self-tuning valley detection
• OTP, OVP, OCP, OPP, OSCP among various other protections
• Very low system no-load power consumption
• Space-saving 37-pin 8 mm X 7 mm QFN Package