请问一下UCC28711或UCC28740的应用,能否应用在下列的参数设计
FLYBACK
VIN:90~480VAC
VOUT:12V / 5A / 60W
用WEBENCH输入以上参数验证,得到下列回覆
Can't find suitable FET for the design. Try reducing load current.
Output Power is beyond the recommended limit.
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请问一下UCC28711或UCC28740的应用,能否应用在下列的参数设计
FLYBACK
VIN:90~480VAC
VOUT:12V / 5A / 60W
用WEBENCH输入以上参数验证,得到下列回覆
Can't find suitable FET for the design. Try reducing load current.
Output Power is beyond the recommended limit.
Hi
这类芯片是700V启动开关, 并且需要留一定Buffer的。480VAC等效678V, 但是加上反激开关关闭时的凸波,会超过规格。
而Webench设置的电压是480Vdc, 480VAC肯定是超过规格的。
如果你的应用超过480V, 一样可以用UCC28740系列,但是就不能用Webench,具体设计可参照如下:http://www.ti.com/lit/ug/tidu412a/tidu412a.pdf
我看Webench设置的电压范围是 85VAC~480VAC
用到480VAC是希望能够做三相输入,如下列你们TI的设计
http://www.ti.com/tool/PMP30164
.
因为我的输出负载需求比较大,用Webench验证被告知
Can't find suitable FET for the design. Try reducing load current.
Output Power is beyond the recommended limit.
.
但看了你们TI Designs有设计在100W、200W的方案
规格书上也没有建议的功率限制
http://www.ti.com/tool/TIDA-00701
http://www.ti.com/tool/PMP10816
.
所以我需求的参数规格有办法用UCC28711或UCC28740做设计吗?
谢谢~
.
参考TI员工的建议,你需求的是可以用UCC28740做的,但无法用WEBENCH输入参数进行设计。