max531 能输出5v电压基准吗

TLV61220输出电压为5V时,输出电流能达到75mA吗 - 电源管理 - 德州仪器在线技术支持社区
TLV61220输出电压为5V时,输出电流能达到75mA吗
发表于2年前
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我按照&a href=&.cn/product/cn/TLV61220& target=&extwin&>TLV61220&/a>技术手册的典型电路搭好电路,输入电压为3.7V,没接负载时输出为5V,当接100欧负载时,输出电压就降为3V,这是什么问题,该怎么解决?&/p>&div style=&clear:&>&/div>" />
TLV61220输出电压为5V时,输出电流能达到75mA吗
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我按照技术手册的典型电路搭好电路,输入电压为3.7V,没接负载时输出为5V,当接100欧负载时,输出电压就降为3V,这是什么问题,该怎么解决?
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榜眼23283分
你的现象很像是过载了,你可以适当调小一点负载,看看是否工作正常。
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榜眼23283分
至于功率,你可以参考datasheet上的图3,如图。
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我要接的负载是传感器,这个传感器必须是5V供电,电流是75mA, 看图表3tlv61220能够输出能够满足75mA的,但是按典型电路接好后,在接传感器,测的输出端的电压就不是5V了,是3V左右
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榜眼23283分
看图3具体值也不好说,不过存在小于75ma的可能性,而且实验条件有所不同,包括电感不同等也会造成有区别。
不过你可以把输入电压适量调高些可以调到4V以上,看能否起来。
用稍轻的负载看看是否能正常输出。
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我们的电感是3.3uH,负载是200欧,当输入电压是3.7V输出是2.98V,输入电压是4V时,输出是3.3V。这个数据和负载是100欧的时候相近。
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探花5560分
这个你可以说试试加一个电压反馈电路来稳定输出电压的。。。
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谢谢大家,我们的电路好用了,之前是因为用面包板搭的电路,芯片与元件之间的距离较远,从新排布使它们连接紧密后就好使了。
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榜眼33056分
解决了就好,感谢分享
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探花5030分
多半是由于反馈没有接好,或者过流保护。
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你好,我想问问是由于器件排布的原因吗?我在面包板上搭建的,想测试好后再加到PCB板上,可是面包板上测试时,输出总比输入电压小。怎么才能测试成功勒?
You have posted to a forum that requires a moderator to approve posts before they are publicly available.如何输入正5V,输出正负12V? - 电源管理 - 德州仪器在线技术支持社区
如何输入正5V,输出正负12V?
发表于2年前
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本人大学生一枚,正在做课程设计,需要做实物,需要用到正负12V,但手里只有正5V电源。&/p>
&p>我知道有个芯片&a href=&.cn/product/cn/DCV010512& target=&extwin&>DCV010512&/a>可以搞定,但奈何datasheet全英文(英语太难看懂有木有),网上关于此芯片使用的电路几乎查不到。&/p>
&p>故再次发帖求教肿么办才好咧?大神快现身好吧。Thank you&/p>&div style=&clear:&>&/div>" />
如何输入正5V,输出正负12V?
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本人大学生一枚,正在做课程设计,需要做实物,需要用到正负12V,但手里只有正5V电源。
我知道有个芯片可以搞定,但奈何datasheet全英文(英语太难看懂有木有),网上关于此芯片使用的电路几乎查不到。
故再次发帖求教肿么办才好咧?大神快现身好吧。Thank you
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我主要是想要看这个芯片外围怎么连接,请各位前辈帮帮忙
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买个小DC/DC电源模块。
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榜眼23283分
您好,应该是吧,可以输出两路,谢谢
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榜眼23283分
我建议你参考的datasheet上Figure 11.具体参数,输入侧1脚 2脚之间接2.2uF的瓷片电容,5脚6脚,5脚7脚,之间接1uF的瓷片电容,8脚 14脚悬空。因为我也没用过这个芯片,希望你可以反馈下你的实验结果,谢谢。欢迎补充和指正。
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榜眼22540分
这个module是隔离型的
像这个图,把Vout2接输出侧的地,最下面的那个引脚就是-12V了。
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举人1070分
如果不想用模块,非要自己设计,你这个芯片可以找点资料里的电路图试验起来
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举人1005分
来自郭天祥的书《新概念51单片机C语言教程.入门、提高、开发》的P122
我以前也遇到过同样的问题,解决方案是用来输出+-12V,作为放大器的电源。
在输入4.3V左右的情况下,的2,6脚,输出+8.5,-8.2V。楼主可以参考一下。
或者用,7812(输出+12v),和7912(输出-12v)。
方案(百度文库的资料):
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这芯片实际就是个电源模块。
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直接买个5V转正负12V的电源。
或者买2个电源,一个是5V转12V,另一个是5V转-12V。
或者买隔离的电源,再处理下接地,接成正负12V的形式。
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你的电流有啥要求啊!
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举人1005分
如果你的课程设计重点不是这个电源,找厂家要个模组样品来用最简单。。。
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举人1070分
参考下极性反转芯片ICL7660,该芯片工作电压范围1.5V-10V,用两个芯片串起来得到-12V。
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举人1005分
这要看正负12V的电流有多少,电流不大的话用电荷泵也是较好的选择。
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大学生英语还差?
再一点,正负电压变换这个电路,在模拟电路这本书里边都有介绍.
用运放都能做出来.
单电压变正负电压的电路.
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