SZ1200 combines ACF Control, GaN FET, X-Cap discharge, Driver and Regulator in Single Chip
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.
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Download SZ1200 Brochures
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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.
![sz1200 ACF controller](https://powerdensity.com/wp-content/uploads/2024/02/sz1200-ACF-controller.jpg)
SZ1200 Key Features:
- 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
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