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我正在设计一个带L5973D开关稳压器的电路,以提供3.8v,并且面临着一个特殊的问题。该电路符合数据表中的设计参考,并提供反馈电阻以提供3.8v输出(10K和4.7K)。最初,我得到3.8v。但是在保持电路连接的同时,它每10分钟左右开始大约10mV。此外,关闭电路然后备份不会导致它再次提供3.8v。想知道发生了什么......
以上来自于谷歌翻译 以下为原文 I am designing a circuit with a L5973D switching regulator to provide 3.8v and am facing a peculiar problem. The circuit is as per the design reference in the datasheet and the feedback resistors are given to provide 3.8v output (10K and 4.7K). Initially, I get 3.8v. But while leaving the circuit connected, it starts inching up about 10mV every 10 minutes or so. Furthermore, powering down the circuit and then back up does not cause it to provide 3.8v again. Wondering what's going on.... |
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4个回答
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嗨,
为了更好地理解,你可以告诉我: 1)5973的输出电流是多少?它会明显升温吗? 2)关闭后:等待一段时间再测量一次吗? 3)反馈电阻:它们是什么类型的? CFR,MFR?你可以用较低的tempco类型替换并重复吗? 问候 以上来自于谷歌翻译 以下为原文 Hi, To better understand could you let me know: 1) What is the output current from the 5973? Is it heating up significantly? 2) After you turn off: do you wait for some time before measuring again? 3) The feed back resistors: what type are they? CFR, MFR? Could you substirute with a lower tempco type and repeat? Regards |
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还有一个问题:应用场景是什么?
以上来自于谷歌翻译 以下为原文 And one more query: what is the application scenario? |
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嗨,
根据我过去在开关模式电源方面的经验,在进行这些设计时需要遵循几个关键点。 1.确保所有电阻均为1%类型,这限制了温度变化,从而限制了输出变化的变化。 2.确保切换点的轨道尽可能靠近线圈,并且不会增加线圈的电阻。 3.输出电容需要具有低ESR类型 希望有些帮助。 以上来自于谷歌翻译 以下为原文 Hi , out of my past experience in switch mode power supplies there is a couple of key points to follow when doing these designs. 1. Ensure all resistors are 1% type, this limits the the change over temperature which in turn will limit the output change variations. 2. ensure the the track from the switching point is close as possible to the coil and does not add resistance to the coil. 3. output capacitors need to have a low ESR type hope some of this helps. |
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嗨,
我对此设备有关于输入电压的问题。数据表显示它可以处理高达35V的输入和40V的最大值。如果供电电源缓慢上升,这一切都很好。然而,如果输入电压处于20V或更高的电压,那么芯片似乎真正地将它的顶部吹得高低。我认为这是因为设备的浪涌电流。在我试图抑制这种浪涌电流时,我使用了与输入功率串联的5欧姆8毫米光盘NTC。这通过吹掉外部TANT帽和令人困惑的芯片引起了一个全新的问题。有任何想法吗? 问候 以上来自于谷歌翻译 以下为原文 Hi, I have a question on this device regarding the input voltage. The data sheet says it can handle up to 35V input and 40V max. This is all good if the the power supplied is ramped up slowly. However if the input voltage is at a instance of 20V or more the chip seems to literally blow its top of. i presume this is because the inrush current to the device. In my attempt to curb this inrush current i used a 5ohm 8mm disc NTC in series with the input power. This caused a whole new problem by blowing the external TANT caps and the chip which confusing. any ideas? regards |
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