MT7201C是一款連續導通模式的(de)降壓型LED恒(heng)流驅動芯片。在(zai)輸(shu)入(ru)電(dian)壓高于LED電(dian)壓時，能有效(xiao)驅動一顆或多(duo)顆串聯(lian)的(de)LED。MT7201C支(zhi)持6V～40V的(de)輸(shu)入(ru)電(dian)壓，輸(shu)出(chu)電(dian)流可調(diao)，最(zui)高可達1A。

MT7201C內(nei)置(zhi)功(gong)率開關管和(he)一個(ge)(ge)高端電(dian)(dian)(dian)流檢測電(dian)(dian)(dian)路(lu)，可通(tong)過外(wai)部電(dian)(dian)(dian)阻(zu)設置(zhi)LED平(ping)均電(dian)(dian)(dian)流，并通(tong)過ADJ引腳接收模擬調(diao)光和(he)PWM調(diao)光信號。芯片內(nei)置(zhi)PWM濾(lv)波電(dian)(dian)(dian)路(lu)，該電(dian)(dian)(dian)路(lu)能通(tong)過控制電(dian)(dian)(dian)流的上升沿從而實現軟啟動。軟啟動的時(shi)間可通(tong)過在ADJ引腳與地之間增加一個(ge)(ge)外(wai)部電(dian)(dian)(dian)容來延長。當ADJ引腳電(dian)(dian)(dian)壓(ya)低于0.2V時(shi)，功(gong)率開關管截止(zhi)，MT7201C將進(jin)入極低工作(zuo)電(dian)(dian)(dian)流的待機狀態。

• 極少的外圍器件

• 高達(da)1A的恒電流(liu)輸出

• 單一引腳實現(xian)開/關、模擬調光和PWM調光

• 內含PWM濾波器

• 良好線性調整率

• 降低EMI的抖頻技(ji)術(shu)

• 效率高達97%

• 寬輸入電壓(ya)范(fan)圍：6V～40V

• 最(zui)大(da)1MHz開關(guan)頻率

• LED開路保護

• 輸出電(dian)流精(jing)度(du)：±5%

• SOT89-5封裝