MT7201C+是一款連(lian)續導(dao)通模式的(de)降壓(ya)(ya)型LED恒(heng)流(liu)驅動芯片。在輸入電(dian)(dian)壓(ya)(ya)高(gao)于LED電(dian)(dian)壓(ya)(ya)時，能有效(xiao)地驅動一顆或多(duo)顆串聯的(de)LED。MT7201C+支(zhi)持6V~50V的(de)輸入電(dian)(dian)壓(ya)(ya)，輸出(chu)電(dian)(dian)流(liu)可(ke)(ke)調，最(zui)高(gao)可(ke)(ke)達(da)1.2A。

MT7201C+內置功(gong)率開關管和一(yi)個高端電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)檢(jian)測電(dian)(dian)(dian)(dian)(dian)路，可通(tong)過(guo)外部電(dian)(dian)(dian)(dian)(dian)阻設置LED平均電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)，并通(tong)過(guo)ADJ引腳(jiao)(jiao)接收模擬調(diao)光和PWM調(diao)光信號。芯片(pian)內置PWM濾波電(dian)(dian)(dian)(dian)(dian)路，該電(dian)(dian)(dian)(dian)(dian)路能通(tong)過(guo)控制電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)的上升沿(yan)從而實現軟啟(qi)動。軟啟(qi)動的時(shi)間可通(tong)過(guo)在(zai)ADJ引腳(jiao)(jiao)與地(di)之間增加一(yi)個外部電(dian)(dian)(dian)(dian)(dian)容來延(yan)長。當(dang)ADJ引腳(jiao)(jiao)電(dian)(dian)(dian)(dian)(dian)壓低于0.2V時(shi)，功(gong)率開關管截(jie)止，MT7201C+將進入(ru)極低工作電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)的待機狀態。

• 極少的外圍器件

• 高達1.2A的恒電流輸(shu)出

• 單(dan)一(yi)引腳實現開/關(guan)、模擬調光和PWM調光

• 內含PWM濾波器

• 降低(di)EMI的抖頻技術

• 效率高達97%

• 寬輸(shu)入電壓范(fan)圍(wei)：6V~50V

• 最大1MHz開關頻率

• LED開路保護

• 輸(shu)出電流精度：±5%

• SOT89-5封裝