This paper introduces a loop controller which is composed of the voltage-driven pulse width modulation control integrated circuit TL494 as the core component and a simple filter circuit and an RC discharge circuit. It can convert the pulse width changing signal into a DC signal which changes in proportion to the pulse width, thereby realizing closed-loop single-loop control. TL494 is a voltage-driven pulse width modulation control integrated circuit produced by Texas Instruments, USA, and is mainly used in various switching power supplies. This paper introduces how it, together with the corresponding input and output circuits, constitutes a single-loop controller.
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