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负载开关IC集各种功能于一体,这些功能都有助于确保系统的稳定运行。
综合功能 |
说明 |
---|---|
过流保护 |
此功能会限制输出电流,当流向负载开关IC的电流过大时(例如,当连接VOUT引脚的负载与GND短路时),可保护系统。 |
热关断 |
当负载开关IC产生的热量超过散热能力,或者当环境温度升高导致结温过度升高时,此功能会关闭负载开关IC。 |
浪涌电流限流(转换速率控制、软启动) |
此功能在导通时缓慢升高负载开关IC的输出电压,以确保系统稳定性。 浪涌电流限流也称为转换速率控制或软启动。 |
自动放电 |
当负载开关IC关闭时,此功能会快速对连接VOUT引脚的滤波电容器进行放电,以利于供电时序。 |
欠压锁定(UVLO) |
例如,当负载开关IC的输入电压由于噪声或电池电压下降而低于阈值时,此功能会关闭其输出,以防止系统失稳。 |
反向电流阻断 | 当VOUT电压高于VIN电压时,此功能可防止负载电流从VOUT引脚反向流向VIN引脚。有两种类型的反向电流阻断:一种是仅当内部MOS传输晶体管关断时,可阻断反向电流的反向电流阻断;另一种是无论导通或关断,都会阻断反向电流的真正反向电流阻断。 |
后续页面对每种功能进行了说明。
以下链接还提供了上述功能的说明:
应用说明:Basics of Load Switch ICs
应用说明:Overcurrent Protection and Reverse Current Blocking of the Load Switch IC