采用SA7527的LED驅動電源方案,此類方案已大批量生產,品質穩定.
優點:
1)高功率因數:0.95以上
2)低諧波:15%以下
3)高效率
缺點:
1)后級輸出紋波大,但對LED沒有影響,如客人有要求,后級可采用DC TO DC的方案.
2)成本比低功率因數的電源略高.
我公司內置的變壓器與骨架已經開出來,配套IC銷售!
具體規格見此貼:http://bbs.dianyuan.com/topic/416018
高功率因數的LED驅動電源,含PCB
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功率因數與諧波測試:
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24V/350MA 應用:
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24V/750MA 應用
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24V/1A 恒壓應用:
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24V/2A 恒壓應用:
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24V/2A 恒壓應用:
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24V/1.5A 應用
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12LED 350mA 輸出
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20LED 350mA
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1A 50V 輸出,采用三極管恒流,會有溫漂!
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@lxq8453
你好!我想找一個10V400mA的LED驅動電路能給一個便宜的方案,我看你們設計的用3個431設計的恒流驅動設計很新穎,不知道效果怎么樣?煩請告知小弟學習學習!
3led 350mA 跟你的參數基本相同,只需改一下恒流電流即可!
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@szevwell
3led350mA跟你的參數基本相同,只需改一下恒流電流即可![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/60/487871197854802.jpg');}"onmousewheel="returnimgzoom(this);">
用3個431恒流肯定沒問題,只是對前面兩個431的精度一致性要求高,這樣做出來的產品,基本上沒有溫飄!TVS350可用上面電路的阻容替代.
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12V 2A 紅綠燈應用方案,供參考!
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@szevwell
12V2A紅綠燈應用方案,供參考![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/60/487871197857353.jpg');}"onmousewheel="returnimgzoom(this);">
非常感謝你!我先搭個電路試驗一下!
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@szevwell
12V2A紅綠燈應用方案,供參考![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/60/487871197857353.jpg');}"onmousewheel="returnimgzoom(this);">
szevwell 兄:你好!看了你的電路很感興趣,不知有沒有可能一個電源分兩路恒流輸出呢?比如說我做個24V/7A的單輸出的恒流開關電源,如何實現分兩路3.5A恒流輸出呢?
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@szevwell
24V/350MA應用:[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/60/487871197597049.jpg');}"onmousewheel="returnimgzoom(this);">
你這個工作在什么模式下,是不是在DCM呢?如果是我認變壓變比可能再修改一下比較好
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