Press Kit SZ1101 and SZ1105

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Silanna Semiconductor Fully Qualifies and Releases 33W and 65W Integrated Active Clamp Flyback Controllers in Production

All-Silicon design combines simplicity of flyback controllers with high efficiency and power density of active clamp flyback controllers. 

The SZ1101 33W version is suited for designing mobile phone travel adapters, while the SZ1105 65W version is suited for designing compact adapters for powering notebooks, video game consoles, and multi-port wall chargers.

SZ1101 PCB Front Side

SZ1101 PCB Back Side

SZ1105 PCB Front Side

SZ1105 PCB Back Side

For High Power Density AC/DC Power Adapters

The SZ1101 and SZ1105 Flyback PWM Controllers are unique in that they combine four key ACF components: an advanced adaptive digital ACF controller and three ultra-high-voltage (UHV) components – an active clamp MOSFET, an active clamp FET driver, and a start-up voltage regulator. This unprecedented level of integration facilitates designing efficient, high-power-density AC/DC power adapters with low bill-of-material (BOM) cost. 

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 maximizes performance on a cycle-by-cycle basis, giving the best performance under all operating conditions.


SZ1101 Key Specs:

  • Input: 90 – 265 VAC

  • Output: 5V/3A, 9V/3A,15V/2.2A, 20V/1.65A or (PPS) 3.3-11V/3A

  • Output Power: 33W Max

  • Output Port: USB-PD 3.0 or PPS

  • Efficiency: > 93.5% full power efficiency with an all silicon design

SZ1105 Key Specs:

  • Input: 90 – 265 VAC

  • Output: 5V/3A, 9V/3A,15V/3A, 20V/3.25A

  • Output Power: 65W Max

  • Output Port: USB-PD 3.0 or PPS

  • Efficiency: > 94% full power efficiency with an all silicon design



SZ1101 and SZ1105 Key Features:

  • Integrated ultra-high-voltage active clamp FET/ driver/startup voltage regulator

  • Advanced adaptive digital controller 

  • Tight switching frequency regulation for improved input EMI filter utilization

  • Cycle-by-cycle adaptive digital control (OptiMode   )

  • 33W and 65W output power, respectively

  • Capable of over 15W/in  and 25W/in  power density, respectively

  • 16-pin SOIC package

  • Meets DoE and CoC efficiency and no-load standby power requirements





High-power-density capabilities help designers overcome the thermal challenges of packing ever-increasing amounts of power into the small-form-factor power adapters that consumers have come to expect that also remain cool to the touch. High efficiency, or reducing power loss, is key to achieving the power density without overheating the adapter’s case. 

Released products and evaluation boards (EVBs) are now available showing industry leading efficiencies in an all-silicon solution, while achieving more than 6dB margin for Electromagnetic Interference (EMI). 

Press Contacts

Moody and Associates PR

Bill Moody:

Michelle Moody:

Phone: 214.363.3460

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High Resolution Visuals

SZ1101 Efficiency 115VAC

Four Key Components

SZ1105 PCB Back

SZ1105 PCB Front

SZ1105 PCB Front/Back Side

SZ1105 Back

SZ1101 Efficiency 230VAC

SZ1105 Efficiency 115VAC

SZ1105 Efficiency 230VAC

SZ1101/1105 Key Features

SZ1101 PCB Front/Back Side

SZ1101 PCB Front

SZ1101 PCB Back

SZ1101 Back

SZ1101 Front/SZ1105 Back

Silanna Logo Horizontal

Silanna Logo Vertical





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