今天我用uc3843做 buck遇到問(wèn)題
我今日我設(shè)計(jì)了這個(gè)buck,反遺不產(chǎn)生作用,所以失敗了,請(qǐng)各位幫忙
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@mingpinky
自舉電路應(yīng)如何加?
如圖:
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@deep_thought
如圖:[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/52/1176644625.jpg');}"onmousewheel="returnimgzoom(this);">
500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/52/1176653561.jpg');}" onmousewheel="return imgzoom(this);">
紅圈的部份要不要接地?
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@mingpinky
[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/52/1176653561.jpg');}"onmousewheel="returnimgzoom(this);">紅圈的部份要不要接地?
反饋部分不對(duì),2腳始終是高電位
建議用TL431+光耦接于輸出端,UC3842的2腳接地,光耦的三極管端接1腳和地,兩端并容量為0.1uf的電容.
建議用TL431+光耦接于輸出端,UC3842的2腳接地,光耦的三極管端接1腳和地,兩端并容量為0.1uf的電容.
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@mingpinky
[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/52/1176653561.jpg');}"onmousewheel="returnimgzoom(this);">紅圈的部份要不要接地?
不用接. D2改為18V穩(wěn)壓管.
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@mingpinky
[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/52/1176653561.jpg');}"onmousewheel="returnimgzoom(this);">紅圈的部份要不要接地?
建議用3843取代3842, 7腳電源改接12V
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@藍(lán)黑
要用P溝道的MOS或者用光耦隔離驅(qū)動(dòng)
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@deep_thought
頻率電路由8腳(5V)供電,跟7腳輸入電壓無(wú)關(guān).
500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/52/1176833015.gif');}" onmousewheel="return imgzoom(this);">
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@mingpinky
[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/52/1176833015.gif');}"onmousewheel="returnimgzoom(this);">[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/52/1176833033.jpg');}"onmousewheel="returnimgzoom(this);">[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/52/1176833039.jpg');}"onmousewheel="returnimgzoom(this);">[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/52/1176833045.jpg');}"onmousewheel="returnimgzoom(this);">
我用上圖的方案,現(xiàn)在Vo可以5V,但當(dāng)Vin上升占空比下是下降,而是,有時(shí)沒(méi)有,應(yīng)如何解決?
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