基于UCC28911型号具有初级侧稳压和恒流控制功能的高电压反激开关

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　　描述

　　The UCC28910 and UCC28911 are high-voltage flyback switchers that provide output voltage and current regulation without the use of an optical coupler. Both devices incorporate a 700-V power FET and a controller that process operating information from the flyback auxiliary winding and power FET to provide a precise output voltage and current control. The integrated high-voltage current source for startup that is switched off during device operation, and the controller current consumption is dynamically adjusted with load. Both enable the very low stand-by power consumption.

　　Control algorithms in the UCC28910 and UCC28911, combining switching frequency and peak primary current modulation, allow operating efficiencies to meet or exceed applicable standards. Discontinuous conduction mode (DCM) with valley switching is used to reduce switching losses. Built-in protection features help to keep secondary and primary component stress levels in check across the operating range. The frequency jitter helps to reduce EMI filter

　　特性

　　Constant-Voltage (CV) and Constant-Current (CC) Output Regulation Without Optical-Coupler

　　±5% Output Voltage Regulation Accuracy

　　±5% Output Current Regulation With AC Line and Primary Inductance Tolerance Compensation

　　700-V Start-Up and Smart Power Management Enables <30-mW Standby Power

　　115-kHz Maximum Switching Frequency Design for High-Power Density

　　Valley Switching and Frequency Dithering to Ease EMI Compliance

　　Thermal Shut Down

　　Low Line and Output Over-Voltage Protection

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