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RT7220B是供反激式电源使用的高性能同步整流控制器,它通过检测MOSFET漏极电压决定同步整流开关的工作状态,可将关断过程的死区时间缩减至最小以提高效率,支持工作在电流连续模式、电流不连续模式和准谐振模式,可在3.3V~13V的输出电压范围内工作。RT7220B内建高耐压线性稳压器,可在输出电压很低时提供足够的MOSFET驱动电压。它在轻载时以节能模式工作,可将工作电流降低至160μA以下,进入节能模式的时间点是通过对MOSFET门极驱动脉冲的计数来确定的。
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