MT7203是(shi)一款連續導(dao)通模(mo)式的降壓(ya)型LED恒(heng)流驅動芯片(pian)。在輸入(ru)電(dian)壓(ya)高于LED電(dian)壓(ya)時，能(neng)有(you)效驅動一顆或多顆串聯的LED。MT7203支(zhi)持(chi)6V～40V的輸入(ru)電(dian)壓(ya)，輸出電(dian)流可調，最高可達(da)800mA。

MT7203內置功(gong)率(lv)開關管和一個(ge)(ge)高(gao)端(duan)電(dian)(dian)(dian)流(liu)檢(jian)測(ce)電(dian)(dian)(dian)路，可通過(guo)外(wai)部電(dian)(dian)(dian)阻設置LED平均(jun)電(dian)(dian)(dian)流(liu)，并(bing)通過(guo)ADJ引(yin)腳(jiao)(jiao)(jiao)接收(shou)模擬調(diao)光和PWM調(diao)光信(xin)號。芯片內置PWM濾波電(dian)(dian)(dian)路，該(gai)電(dian)(dian)(dian)路能(neng)通過(guo)控制電(dian)(dian)(dian)流(liu)的上(shang)升沿從而實現(xian)軟(ruan)啟動。軟(ruan)啟動的時間可通過(guo)在ADJ引(yin)腳(jiao)(jiao)(jiao)與地之(zhi)間增加一個(ge)(ge)外(wai)部電(dian)(dian)(dian)容來延(yan)長。當ADJ引(yin)腳(jiao)(jiao)(jiao)電(dian)(dian)(dian)壓低于(yu)0.2V時，功(gong)率(lv)開關管截止，MT7203將(jiang)進入極低工作電(dian)(dian)(dian)流(liu)的待機(ji)狀態。

• 極少的外圍器件

• 高達800mA的(de)恒電流輸(shu)出

• 單一(yi)引腳(jiao)實現開/關、模擬(ni)調光和(he)PWM調光

• 內含PWM濾波器

• 良好線性調整率

• 降低EMI的抖頻技術

• 寬(kuan)輸(shu)入電壓范圍：6V～40V

• 最大(da)1MHz開(kai)關(guan)頻率

• LED開路保護

• 輸(shu)出電流精(jing)度(du)：±5%

• SOT23-5封裝