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想请教几个TL4242驱动的应用问题：
1.TL4242 PWM的频率是多少
2.TL4242的ST引脚在应用时应该怎么连接
PWM频率貌似要由其控制的LED电流上升、下降时间决定。最大上升/下降时间40us，那么加在PWM上的频率不能超过12.5kHz。
ST用来检测没有负载电流时的状态，负载断流并且VREF电压小于25mV，ST输出low，它是个OC逻辑
