SZ1131 Flyback PWM Controller with Integrated Active Clamp Circuit Product Brief
The device provides the ease-of-design of a simple flyback controller with all the benefits of an ACF design, including recycling of the leakage inductance energy of the flyback transformer and limiting the primary FET drain voltage spike during the turn-off events. Employing Silanna's OptiMode™ digital control architecture, the SZ1131 adjusts its 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.
Furthermore, the switching frequency is confined within a tight frequency band for simplified EMI filtering. In addition, adaptive digital control of the active clamp operation enables near ZVS turn-on of the primary FET and clamps the drain voltage during the turn-off, further improving efficiency and reducing EMI.
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. The SZ1131 is well suited for high efficiency and high-power density AC/DC power adapters. The device is designed for up to 65 W output power for universal AC input and 100W output power with front-end PFC support, including USB-PD and PPS applications.
The SZ1131 is available in a space saving 16-pin SOIC package.
●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
■< 20 mW System No Load Power Consumption
■Up to 146 kHz Switching Frequency Operation
■OptiMode™ Cycle-by-Cycle Adaptive Digital Control
■Self-tuning Valley Mode Switching (VMS)
■Advanced QR VMS for > 6dB EMI Margin
■Tight Switching Frequency Regulation for Improved Input EMI Filter Utilization
■Multi-Mode Operation (Burst Mode, QR, VMS)
■OTP, OVP, OCP, OPP, OSCP, TSP Protections
■Up to 65 W Output Power for Universal AC Input
■100W+ Output Power with Front-End PFC
■16-pin SOIC Package
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[ High Power Density AC/DC Power Supplies ][ High Efficiency Power Adapters ][ USB-PD/QC AC/DC Power Adapters ][ Battery Chargers for Mobile Devices ] |
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Datasheet |
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Please see the document for details |
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SOIC |
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English Chinese Chinese and English Japanese |
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2021/09/08 |
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Ver. 1.0 |
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503 KB |
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