Shutdown of the UC1842 can be accomplished by two methods either raise pin 3 above 1 V or pull pin 1 below a voltage two diode drops above ground. Either method causses the output of the PWM comparator to be high (refer to block diagram). The PWM

打印最高分和学号,编程打印某班一门课成绩的最高分及其学号-pint the highest score and number