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

Silanna SZ1101 SZ1105

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

Silanna Semiconductor announced that its SZ1101 and SZ1105 fully integrated active clamp flyback (ACF) controllers for designing high-power-density AC/DC power adapters are now fully qualified and in production. The SZ1101 33 W version is suited for designing mobile phone travel adapters, while the SZ1105 65 W version is suited for designing compact adapters for powering notebooks, video game consoles, and multi-port wall chargers.

Silanna - SZ1101, SZ1105

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 startup voltage regulator. 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 (EVBs) are now available showing industry leading efficiencies in an all-Silicon solution, while achieving more than 6 dB margin for Electromagnetic Interference (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 maximizes performance on a cycle-by-cycle basis, giving the best performance under all operating conditions.”

The SZ1101 evaluation board; top view (left) and bottom (right)
The SZ1101 evaluation board; top view (left) and bottom (right).

Key Specs:

  • Input: 90 – 265 VAC
  • Max Output Power: 33 W (SZ1101), 65 W (SZ1105)
  • Output Port: USB-PD 3.0 or PPS
  • Efficiency: > 94% full power efficiency with an all silicon design

Key Features:

  • Integrated ultra-high-voltage active clamp FET, driver, and startup voltage regulator
  • Tight switching frequency regulation for improved input EMI filter utilization
  • Cycle-by-cycle adaptive digital control (OptiMode™)
  • Capable of over 25 W/in3 power density
  • Meets DoE and CoC efficiency and no-load standby power requirements

Availability and Pricing:

Hiccup (02) and latched (03) mode versions are available immediately for both the 33W SZ1101 and the 65 W SZ1105, and all parts feature the industry-standard 16-pin SOIC package. 10K-piece pricing is $1.06 for the SZ1101, and $1.22 for the SZ1105. USB-PD EVBs are also available.

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