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RT7220B是供反激式電源使用的高性能同步整流控制器,它通過檢測MOSFET漏極電壓決定同步整流開關的工作狀態,可將關斷過程的死區時間縮減至最小以提高效率,支援工作在電流連續模式、電流不連續模式和准諧振模式,可在3.3V~13V的輸出電壓範圍內工作。RT7220B內建高耐壓線性穩壓器,可在輸出電壓很低時提供足夠的MOSFET驅動電壓。它在輕載時以節能模式工作,可將工作電流降低至160μA以下,進入節能模式的時間點是通過對MOSFET門極驅動脈衝的計數來確定的。
適用於反激式電源的低側同步整流,支援CCM/DCM/准諧振模式
適合3.3V~13V輸出使用
正常模式下電流消耗低於1.2mA(不包括驅動器消耗)
節能模式下電流消耗低於160μA
輸出電壓低於5V時由內建高壓LDO為驅動電路供電
用自我調整跟蹤控制優化效率
最高工作頻率:180kHz
保護特性►柵極驅動器有6V電壓限制►啟動前柵極驅動器輸出維持低電平狀態►可選最短時長保護►可選同步整流最短關斷時間►VG快速關斷(總延時低於50ns)
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