MT7990是一款基(ji)于隔離反激式恒壓(ya)(ya)開關(guan)電(dian)(dian)(dian)源控(kong)制(zhi)(zhi)器，它內部集(ji)成了恒壓(ya)(ya)控(kong)制(zhi)(zhi)模式和低(di)壓(ya)(ya)限(xian)流控(kong)制(zhi)(zhi)電(dian)(dian)(dian)路，當負載(zai)電(dian)(dian)(dian)流在限(xian)流值以內時，MT7990控(kong)制(zhi)(zhi)開關(guan)電(dian)(dian)(dian)源輸(shu)出(chu)(chu)恒定電(dian)(dian)(dian)壓(ya)(ya)；當負載(zai)增大(da)導致輸(shu)出(chu)(chu)電(dian)(dian)(dian)壓(ya)(ya)下降時，MT7990控(kong)制(zhi)(zhi)開關(guan)電(dian)(dian)(dian)源工(gong)作限(xian)定輸(shu)出(chu)(chu)電(dian)(dian)(dian)流。

根據負載(zai)的情況(kuang)（輕載(zai)、重(zhong)載(zai)等），MT7990自(zi)動調節系(xi)統進入準諧振（QRM）模(mo)式、斷續電流（DCM）模(mo)式、脈沖頻率調制(zhi)（PFM）模(mo)式和(he)(he)打嗝（Hiccup）模(mo)式等等。因(yin)此擴大(da)了(le)(le)輸出負載(zai)范圍(wei)，提高了(le)(le)效率和(he)(he)抗電磁干(gan)擾的能力。

MT7990內部集成了多重(zhong)的保護(hu)功能，比如(ru)過溫保護(hu)、過壓保護(hu)、短路保護(hu)等等，提高(gao)了可靠性。

• 啟動無需內部/外部高壓MOS
  

• 寬輸出負載范圍

• 重(zhong)載時工作在準諧振模式(shi)下(xia)降低電(dian)磁干擾

• 精準的(de)輸(shu)出(chu)電(dian)壓檢測和電(dian)纜(lan)壓降(jiang)補償

• 在恒壓調制(zhi)下響(xiang)應快速

• 恒壓調制下(xia)的低(di)紋波輸出

• 多重保護機制

• 軟啟動功能

• SOP8封裝