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RT7753GCN系列产品的设计目标是与类似RT7202的控制器配合以提供一个使用USB电源传输(USB PD)协议的或可程控的电源适配器,它具备高效电源的控制架构,待机功耗极低,5V输出的待机功耗低于50mW。RT7753GCN使用诸多全新的技术来确保获得宽范围的输出电压,如(1)通过使用DMAG引脚对输出电压进行检测并调节系统的环路增益,改变不同输出电压下的过压保护阈值以实现对外部设备的保护,并且调节电流限制阈值以符合功率有限电源的安全需求;(2)具备广泛的保护特性,其中包括大电容Brown-in/Brown-out保护、VDD过压保护、输出过压/欠压保护、次级整流器短路保护和外部温度过高保护;(3)为实现恒定输出功率调节而在CS引脚连接一只电阻,可在全输入电压范围内获得精确的线路补偿;(4)具备多种保护特性以应对次级侧的元件如RT7202、分流式调节器等的失效可能带来的风险。在实际的应用中,建议将RT7753GCN与二次侧控制器RT7202共同使用以构成可靠、强壮又安全的设计,以便能面对诸如设备、电缆、插头、插座等各种可能的错误连接状况。
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