Analysis of PWM + RC Circuit

Circuit Simulation and Analysis

When designing the PWM wave RC filter circuit, the time constant should be determined according to the response time requirement, and the RC time constant should be far greater than the PWM period. The RC charge/discharge time constant should be equal as much as possible. In addition, the RC parameters should be determined according to the voltage precision requirements.

Output voltage = PWM Voltage * duty cycle

For example, 1.49 v = 5 V * 30%

When analyzing the amplitude frequency response, the circuit should contain an AC signal source.