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嗨,我想用8MHZ的PIC18F4523控制电压调节器(LT3080)。我想为上述调节器产生一个相当精确的控制电压(2mV步骤)。我想出了两个可能的解决方案,并且希望你能帮助我决定哪一个是最好的。解决方案离子1)使用PWM信号+ RC滤波器+电压跟随器。如果我选择这种方法,PWM频率是最有效的?我需要Op Amp吗?解决方案2)使用直流(像MCP4922)+电压跟随器。如果我选择这种方法,我必须处理什么类型的问题?我真的很想听听你的意见!关于弗朗西斯科C
以上来自于百度翻译 以下为原文 Hi, I want to control a voltage regulator (LT3080) using a PIC18F4523 running at 8MHZ. I would like to generate a control voltage, for the above regulator, that is reasonably accurate (2mV steps). I came up with two possible solutions and would like you to help me to decide which one is the best. Solution 1) Use a PWM signal + RC filter + voltage follower. If I choose this method what PWM frequency is most effective? And do I need a very precice Op Amp? Solution 2) Use a D.A.C. (like MCP4922) + voltage follower. If I choose this method what are the kind of issue I have to take care-of? I would really like to hear you opinion! Regards Francesco C |
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4个回答
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我用一个18F2553(更好的ADC分辨率读取)和一个I2C DAC做了SimiIAR。
以上来自于百度翻译 以下为原文 I made something simiilar using a 18F2553 (better ADC resolution for reading) and an I2C DAC as you state. |
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我经常使用DAC方法来调整开关模式VReg的输出。我通常使用MCP4725(内部VRef)或MCP4726(外部VRef),因为我喜欢它的小尺寸和在它的EEPROM中存储默认启动值的能力。他三个电阻(VREG反馈分频器和DAC & GT;反馈引脚),以获得我想要的范围!-)而且,您不需要具有DAC的电压跟随器,因为所有DAC的报价都有缓冲输出,所以两种方法具有相似的组件计数。
以上来自于百度翻译 以下为原文 I often use the DAC method for adjusting the output of switchmode VReg's. I usually use the MCP4725 (internal VRef) or MCP4726 (external VRef), as I like it's small size and ability to store a default startup value in it's EEPROM. The only difficulty I have encountered is calculating the values of the three resistors (VReg feedback divider and DAC->feedback pin) to get the range I want! ;-) Also, you don't need a voltage follower with the DAC, as all DAC's quoted have buffered outputs, so both methods have similar component count. |
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这两种解决方案都是可能的。你也可以有一个PWM控制降压/升压转换器。吨的选择。你的设计参数是什么?输入电压输入电流(最大)输出电压(范围)输出电流(MAX)分辨率(2MV右?)期望的复杂性水平(定性问题,我知道)期望成本(?)我会回答这些问题,因为您在解决方案方面可能受到限制,并且了解这一点很有用。我还建议您在Dave设计一个MCU控制的台式电源时,观看EEVblog#221-实验室电源设计-第1部分和EEVblog#222-实验室电源设计-第2部分(以及本系列中的其他视频)。上升。设计合理。
以上来自于百度翻译 以下为原文 Both solutions are possible. You could also have a PWM controlled buck/boost converter. Tonnes of options. What are your design parameters?
I'd also recommend you watching EEVblog #221 - Lab Power Supply Design - Part 1 and EEVblog #222 - Lab Power Supply Design - Part 2 (and other videos in the series) as Dave designs an MCU controlled bench top power supply. Reasonably good design. |
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嗨,谢谢大家。所以这两种设计都同样适合这项任务。所以我掷硬币,D.A.C.设计获胜。谢谢大家。Francesco C.
以上来自于百度翻译 以下为原文 Hi, thank you to all. So both type of design are equally good for the task. So I tossed the coin and....the D.A.C. design wins. Thank s everybody. Francesco C |
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