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③脚为控制比较放大器和误差比较放大器的公共输出端,输出时表现为或输出控制特性,也就是在两个放大器中,输出幅度大者起作用。当③脚的电平变高时,TL494送出的驱动脉冲宽度变窄;当③脚电平低时,驱动脉冲宽度变宽。④脚为死区电平控制端,从④脚加入的死区控制电压可对驱动脉冲的最大宽度进行控制,加上0～3.3 V的电压可以使截止时间从2%线性变化到100%。适当设置死区时间,使截止时间在上述线性变
③ feet for the control of the amplifier and the error amplifier compared to the public output, the output performance or output control characteristics, that is, in both amplifiers, the output amplitude of the greater effect. When the level of pin 3 becomes high, the width of the driving pulse sent by the TL494 becomes narrower. When pin 3 is low, the driving pulse width becomes wider. (4) The dead-band level control pin is used to control the maximum width of the driving pulse by adding the dead-zone control voltage from pin 4, and the voltage can be changed from 2% to 100% with the voltage of 0 ~ 3.3V. Set the dead time properly so that the deadline will change linearly above