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来源：百度知道 编辑：UC知道 时间：2024/05/10 09:11:22
Shutdown Options (See Block diagram, front page) Since both the compensation and soft–start terminals (Pins 9 and 8) have current source pull–ups, either can readily accept a pull–down signal which only has to sink a maximum of 100 mA to turn off the outputs. This is subject to the added requirement of discharging whatever external capacitance may be attached to these pins. An alternate approach is the use of the shutdown circuitry of Pin 10 which has been improved to enhance the available shutdown options. Activating this circuit by applying a positive signal on Pin 10 performs two functions: the PWM latch is immediately set providing the fastest turn–off signal to the outputs; and a 150 mA current sink begins to discharge the external soft–start capacitor. If the shutdown command is short, the PWM signal is terminated without significant discharge of the soft–start capacitor, thus, allowing, for example, a convenient implementation of pulse–by–pulse current limiting. Holding Pin 10 h

我来试试。
关机选项（请查看最前页框图）： 由于补偿端子和软开始端子（管脚9和管脚8）都有电流源拉升，所以二者中的任一端子都可以接受一个下拉信号从而关闭输出——这个下拉信号只需下拉最多100mA即可。这依赖于额外的连接到这些管脚上的电容进行放电。另外一种方法是使用管脚10上的关机电路，这一电路已被改进以增强可用的关机选项。在管脚10上加上一个正信号激活这一电路，可以实现两个功能：PWM（脉宽调制）锁立即在输出中产生最快速度的关闭信号，同时一个150mA的吸入电流开始让外接软开始电容器放电。如果关机命令很短促，PWM（脉宽调制）信号终结时外接软开始电容器放电并不多，因此，举个例子，可以实现一种方便的方式，来产生脉冲式限流。否则，管脚10高电平保持较长时间则会导致外接电容器彻底放电，而在释放后（取消管脚10的高电平，我认为是这个意思），重新开始一个慢速启动。当发现噪声拾取停止正常运行时，管脚10（电平）不应当继续浮动。

Shutdown Options (See Block diagram, front page) Since both the compensation and soft–start terminals (Pins 9 and 8) have current source pull–ups, either can readily accept a pull–down signal which only has to sink a maximum of 100 mA to turn off the outputs. This is subject to the added requirement of discharging whatever external capacitance may be attached to these pins. An alternate approach is the use of the shutdown circuitry of Pin 10 which has been improved to enhance the available shutdown options. Activating this circuit by applying a positive signal on Pi