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雙聯雙控開關的接線方法
(1)看雙聯雙控開關的導線顏色:比如火線是紅色的;零線是藍色的;而來回線是綠色的。
(2)雙聯雙控開關的接線過程:用一個雙控開關的中間接線柱去連接到火線,再然后將另一個雙控開關的中間接線柱連接到燈頭,再連接來回線,就是將兩條綠色的導線任意連接上下兩個接線柱,而零線則直接連接到燈頭的另一個觸點就可以了,非常簡單。
1FT 6031-4AK71-3EG1 的內部電路由基準電壓產生電路、振蕩電路、間歇期調整電路、兩個誤差放大器、脈寬調制比較器以及輸出電路等組成。
TL494引腳圖:
其中:
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4腳為間歇期調理,其上加0~3.3V電壓時可使截止時間從2%線懷變化到100%;
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8、9腳和11、10腳分別為TL494內部兩個末級輸出三極管集電極和發射極;
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13腳為輸出控制端,該腳接地時為并聯單端輸出方式,接14腳時為推挽輸出方式;
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15、16腳是誤差放大器II的反相和同相輸入端。
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TL494主要特征:
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集成了全部的脈寬調制電路。
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片內置線性鋸齒波振蕩器,外置振蕩元件僅兩個(一個電阻和一個電容)。
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內置誤差放大器。
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內止5V參考基準電壓源。
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可調整死區時間。
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內置功率晶體管可提供500mA的驅動能力。
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推或拉兩種輸出方式。
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