LED恒流驅動應用-L5973系列應用討論

ST L5973AD 定頻500KHz
ST L5973D 定頻250KHz

我用L5973D做恒流輸出0.35A,陽極BUCK-BOOST回路,輸入電壓8V-24V,輸出9V-15V.發現該芯片很容易震蕩,工作不穩定,發熱比較嚴重.后經過調整輸出電流波形已基本穩定,但IC發熱仍嚴重,不知道有沒有曾經做過的朋友能不吝賜教.謝謝!
PS.附件的文檔是原理圖和12VDC輸入時9V,12V,15V輸出的電流波形.現在的工作狀態基本正常,但IC仍有近60多度的溫升.

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yzx82322

LV.1

2007-09-19 09:18

自己頂一下,有沒有用這塊芯片做過恒流BUCK-BOOST的高手出來指導一下.
順便把波形圖重新貼一下,這次加入了OUT腳的輸出波形.
12Vin-9Vout-Iout waveform

500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/57/864521190164567.jpg');}" onmousewheel="return imgzoom(this);">
12Vin-9Vout-PinOUT waveform

500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/57/864521190164578.jpg');}" onmousewheel="return imgzoom(this);">
12Vin-12Vout-Iout waveform

500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/57/864521190164625.jpg');}" onmousewheel="return imgzoom(this);">
12Vin-12Vout-PinOUT waveform

500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/57/864521190164648.jpg');}" onmousewheel="return imgzoom(this);">
12Vin-15Vout-Iout waveform

500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/57/864521190164670.jpg');}" onmousewheel="return imgzoom(this);">
12Vin-15Vout-PinOUT waveform

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yzx82322

LV.1

2007-09-20 12:06

@yzx82322

自己頂一下,有沒有用這塊芯片做過恒流BUCK-BOOST的高手出來指導一下.順便把波形圖重新貼一下,這次加入了OUT腳的輸出波形.12Vin-9Vout-Ioutwaveform[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/57/864521190164567.jpg');}"onmousewheel="returnimgzoom(this);">12Vin-9Vout-PinOUTwaveform[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/57/864521190164578.jpg');}"onmousewheel="returnimgzoom(this);">12Vin-12Vout-Ioutwaveform[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/57/864521190164625.jpg');}"onmousewheel="returnimgzoom(this);">12Vin-12Vout-PinOUTwaveform[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/57/864521190164648.jpg');}"onmousewheel="returnimgzoom(this);">12Vin-15Vout-Ioutwaveform[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/57/864521190164670.jpg');}"onmousewheel="returnimgzoom(this);">12Vin-15Vout-PinOUTwaveform[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/57/864521190164697.jpg');}"onmousewheel="returnimgzoom(this);">

有人做過的么?我頂.

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