ACF controller for power adapters offers high integration and efficiency

Silanna Semiconductor has released a new integrated ACF controller that will lessen the operational and no-load/standby power consumption of high-efficiency chargers and adapters while pushing down component count, BOM cost and size.

The SZ1131 ACF controller is the newest addition to its family of CO2 Smart Power technologies. These technologies meet the ultimate power management challenge confronting engineers by easing design and improving performance whilst meeting environmental sustainability goals through more efficient energy use. In the case of this controller, efficiencies of up to 95% across universal (90VAC-265VAC) input voltages and varying loads, coupled with ultra-low no-load power of less than 20mW (including USB-PD applications), significantly decrease overall energy consumption.

Mark Drucker, Silanna Semiconductor’s CEO, comments: “This device sets a new benchmark for integration and further re-enforces Silanna’s commitment to combining performance and sustainability. Chargers for smartphones and laptops are often left plugged in, even if they are only charging for a few hours at a time. By focusing on extending efficiency margins against CoC, DoE and other regulatory requirements and driving down no-load power, we allow customers to deliver best-in-industry efficiency under varying line, load and temperature conditions at the same time as minimising ‘vampire’ power.”

The new ACF controller targets high efficiency and high-power density adapters of up to 65W output power with universal input and 100W output power with PFC-support applications and includes single-port and multi-port USB-PD fast chargers. Providing the industry’s highest level of integration, the device includes an adaptive digital PWM controller, UHV active clamp FET, active clamp gate driver and startup regulator.

Supplied in a 16-pin SOIC package, the device provides protection against over-temperature, over-voltage, over-current, over-power and short circuit conditions, and transformer core saturation faults with no requirement for extra external components.