Active clamp flyback controllers are compact for mobile power
Using an all-silicon design, Silanna Semiconductor says its SZ1101 and SZ1105 fully integrated active clamp flyback (ACF) controllers combine the simplicity of flyback controllers with high efficiency and power density of active versions.
The SZ1101 AFC is suited for designing mobile phone travel adapters, while the SZ1105 65W model is for designing compact adapters for powering notebooks, video game consoles, and multi-port wall chargers.
The SZ1101 and SZ1105 flyback PWM controllers combine an advanced adaptive digital ACF controller, a high voltage active clamp MOSFET, FET driver and a startup voltage regulator. Silanna Semiconductor claims that this “unprecedented level of integration” facilitates designing efficient, high-power-density AC/DC power adapters with low bill-of-material (BoM) cost.
Released products and evaluation boards (picture) are available now to demonstrate the controllers while achieving more than 6dB margin for EMI.
Director of marketing, Ahsan Zaman explained, “Silanna’s all-silicon design combines the simplicity of traditional flyback controllers with the efficiency and power density enabled by ACF controllers. The SZ1101 and SZ1105 reduce BoM cost not only by integrating the ACF circuit but also by enabling designers to use a lower-cost transformer, SR FET, clamp capacitor, and input filter. Our proprietary OptiMode control maximises performance on a cycle-by-cycle basis, giving the best performance under all operating conditions.”
Input voltage is 90 to 265V AC. The output port is a USB-PD 3.0 or programmable power supply (PPS).
The adapters are capable of over 25W/in3 power density and meet DoE and CoC efficiency and have no-load standby power requirements.
The SZ1101 and SZ1105 fully integrated active clamp flyback (ACF) controllers for designing high-power-density AC/DC power adapters are now qualified and in production.
Silanna Semiconductor is headquartered in San Diego, California, USA and is a privately-held semiconductor company offering DC/DC and AC/DC power converter ICs which it claims deliver best-in-class efficiency and high frequency operation, enabling customers to build end products with breakthrough power density.
It is an ISO 9001:2015 certified company, and has design centres and satellite offices in North America, Europe, Asia, and Australia.
