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RT7740是改善了效率表现的多模态反激式开关电源PWM控制器,其中使用了立锜专有的智能抖频(SmartJitterTM)技术,具有节能模式EMI辐射水平低的特性,同时消除了频率抖动对输出纹波的影响。它具有多种控制模式,可工作在连续导通模式、非连续导通模式和谷底切换的非连续导通模式,效率高,性能好。RT7740将电流模式PWM控制技术应用于反激式转换器中,同时还具有各种可调保护特性如延迟补偿机制、输出过压保护、外围过热保护、大电容Brown-in/Brown-out保护等,可被使用于要求性价比高、体积紧凑、电压范围宽的AC/DC应用中,其封装形式为SOT-23-6。建议的接面温度范围为-40°C至125°C,而环境温度范围则为-40°C至85°C。
使用立锜专有的SmartJitterTM技术►降低了开关电源的EMI辐射►消除了频率抖动导致的输出电压纹波
工作于连续导通模式、非连续导通模式和谷底切换的非连续导通模式
超低启动电流(< 3μA )
精确的过流保护
可调线路补偿
可调输出过压保护
可调外围过热保护
可调大电容Brown-in/Brown-out保护
200mA/-300mA驱动能力
高噪声抑制能力
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