原边反馈

Si-Power

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原边控制六级能效恒压/恒流系列产品

SP2639AF是一款性能优异的原边反馈控制电路，应用于小功率AC/DC充电器与适配器。控制电路使用原边采样技术进行精确的恒流、恒压控制，可以省去一般应用中的光耦与TL431。\n\n       在恒流模式下，输出电流可由CS引脚外接的采样电阻RCS设定。在恒压模式下，芯片的多种工作模式可以保证较高的整体转换效率。\n\n       此外，芯片内置线缆压降补偿，由此取得良好的负载调整率。SP2639AF在恒流模式下工作于PFM状态，在恒压模式下工作于PWM+PFM状态，轻载时降频工作。SP2639AF工作电流很低，能够实现小于75mW待机功耗的应用方案。\n\n       SP2639A • 全电压范围内具有很高的恒压精度、恒流精度\n• 内置650V功率管\n• 使用原边反馈控制，可省去光耦与TL431\n• 可调节设定的恒流值与输出功率\n• 内置原边反馈恒流控制\n• 内建自适应峰值电流控制\n• 内建原边电感补偿\n• 具有良好的动态响应\n• 多模式控制方式提高工作效率\n• 全电压范围（85~264V）输入时待机功耗小于75mW;

Si-Power

硅动力

12-Bit Parallel Input Voltage Output DAC with Internal Reference

DESCRIPTION The WM2639 is a 12-bit voltage output, resistor string, digital-to-analogue converter. A hardware controlled power down mode is provided that reduces current consumption to 10nA. The device has been designed to interface efficiently to industry standard microprocessors and DSPs. FEAT

文件：342.3 Kbytes 页数：10 Pages

WolfsonWolfson Microelectronics plc

欧胜欧胜微电子股份有限公司

12-Bit Parallel Input Voltage Output DAC with Internal Reference

DESCRIPTION The WM2639 is a 12-bit voltage output, resistor string, digital-to-analogue converter. A hardware controlled power down mode is provided that reduces current consumption to 10nA. The device has been designed to interface efficiently to industry standard microprocessors and DSPs. FEAT

文件：342.3 Kbytes 页数：10 Pages

WolfsonWolfson Microelectronics plc

欧胜欧胜微电子股份有限公司

12-Bit Parallel Input Voltage Output DAC with Internal Reference

DESCRIPTION The WM2639 is a 12-bit voltage output, resistor string, digital-to-analogue converter. A hardware controlled power down mode is provided that reduces current consumption to 10nA. The device has been designed to interface efficiently to industry standard microprocessors and DSPs. FEAT

文件：342.3 Kbytes 页数：10 Pages

WolfsonWolfson Microelectronics plc

欧胜欧胜微电子股份有限公司