Fulfilling Customer Orders with Production Quantity of Flyback PWM Controllers with Integrated Active Clamp Circuits

San Diego, CA – September 16th, 2020 – Silanna Semiconductor, The Power Density Leader, today announced the full production release of the industry-leading expanded portfolio of Active Clamp Flyback Controllers (ACF).  Silanna Semiconductor focuses on the ultimate power management challenges with best-in-class power density and efficiency that delight customers with unprecedented BOM savings.  First announced in April 2020, Silanna Semiconductor has achieved full production release of the SZ1130 ACF PWM controllers, delivering on the customer expectations and market penetration of Active Clamp Flyback Controllers.

SZ1130 devices are ACF controllers that integrate an adaptive digital PWM controller and the following Ultra High-Voltage (UHV) components: an Active Clamp FET, Active Clamp Gate Driver, and a Startup Regulator.  This unprecedented integration level facilitates designing efficient, high-power-density adapters with low BOM cost to satisfy power-hungry mobile phones, tablets, notebooks, and video game consoles.

The SZ1130 has seen exceptional customer demand. The technical sales team has been working directly with customers’ designs demonstrating the ACF controllers, delivering over 94% efficiency with an all-silicon design and 30 W/in3 power density at 65 W for universal input AC/DC power adapters. All this, alongside the extensive AC/DC and DC/DC products, are available at the demo room at https://www.powerdensity.com.

“We were looking for an extremely powerful product that can charge our devices very quickly. We established that the SZ1130 is very dense yet can handle up to 65 W of output power with quick charge applications,” said Tony Wu, Chief Technology Officer of Heytech, the Shenzhen based design house providing state-of-art power supply solutions to Major ODMs in China. “We feel confident using the SZ1130 due to the all-silicon design and 30 W/in3 power density at 65 W output power. Not only does this provide high speed, but the silicon has temperature resistant properties, which is of great importance to us.”

The device provides the ease-of-design of a simple flyback controller with all the benefits of an Active Clamp Flyback design, including recycling the leakage inductance energy of the flyback transformer and limiting the primary FET drain voltage spike during the turn-off events. Employing Silanna Semiconductor’s OptiModeTM digital control architecture, the SZ1130 adjusts the device’s mode of operation on a cycle-by-cycle basis to maintain high efficiency, low EMI, fast dynamic load regulation, and other key power supply parameters in response to varying line voltage and load. The SZ1130 is fully supported by the Silanna Semiconductor’s Asian Center of Excellence (ACE) design support center. The technical sales team and design software make the SZ1130 an easy option for customers.

“Unlike conventional ACF designs, tight tolerances of the clamp capacitor and leakage inductance values are not required for proper operation of the circuit in high volume production,” said Ahsan Zaman, Director of Marketing.  “The SZ1130 is well-suited for high efficiency and high power density AC/DC power adapters. The devices are designed for 65 W (SZ1130) output power, including USB-PD and Quick Charge applications.”

SZ1130-based AC/DC power supplies easily meet the stringent DoE and CoC efficiency and no-load standby power requirements.

Key Features:

  • Integrated UHV Active Clamp FET, Active Clamp Driver, and Start-up Regulator
  • Capable of Over 94% Efficiency
  • Flat Efficiency Across Universal (90 – 265 Vac) Input Voltage and Load
  • Up to 146 kHz Switching Frequency Operation
  • OptiMode™ Cycle-by-Cycle Adaptive Digital Control
  • Self-Tuning Valley Mode Switching (VMS)
  • Multi-Mode Operation (Burst Mode, QR, VMS)
  • > 6dB EMI Margin
  • OTP, OVP, OCP, OPP, and Output Short Circuit Protections
  • < 50 mW No Load Power Consumption
  • 65 W Output Power
  • 16-pin SOIC Package


  • High Power Density AC/DC Power Supplies
  • High-Efficiency Power Adapters
  • USB-PD/QC AC/DC Power Adapters
  • Battery Chargers for Mobile Devices

Availability and Pricing:

Sample information and live demonstrations are available at https://www.powerdensity.com. For pricing inquiries, contact sales@silanna.com.

About Silanna Semiconductor: The Power Density Leader. Delivering on the ultimate Power Management challenge of best-in-class power density and efficiency performance that delights customers with unprecedented BOM savings. Silanna Semiconductor’s AC/DC and DC/DC power converter ICs are driving key innovations in Travel Adapters, Laptop Adapters, Appliance Power, Smart Metering, Computing, Lighting, Industrial Power, and Display Power utilizing the latest digital and analog control and device technologies. In addition to our global engineering sales force, customers are supported by regional design centers and online tools. ‘Power Density Hero’ is an online design tool where customers input their power needs and instantly receive a complete design, schematic, and ‘Bill of Materials’ (BOM). The Asian Center of Excellence (ACE) has a dedicated team of power system engineers to support our customers in their application specific design needs. Silanna Semiconductor, headquartered in San Diego, CA, is a privately-held semiconductor company, and has global facilities supporting customers with design centers and offices in North America, Europe, Asia, and Australia.

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Press Kit

https://www.powerdensity.com/presskit-sz1110-sz1130 “Less than a year ago, we launched the SZ1101, the world’s first fully integrated Active Clamp Flyback Controller, to an incredible customer and industry response,” said Mark Drucker, CEO of Silanna Semiconductor.  “This expansion into higher power and smaller form factors speaks to our core power density leadership.  Silanna Semiconductor delivers AC/DC solutions with the highest Power Density and Efficiency while simultaneously delivering the greatest value and reduced BOM costs.”