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PWM-to-DC-Lowpass-Calculator.php    8648 Bytes    11-04-2022 13:20:12


PWM to DC Lowpass Calculator


Online components calculator







PWM Voltage [Vpp]
(output voltage swing)
Permissible Ripple [mVpp]
 
Necessary Attenuation [dB]
 



PWM Frequency [kHz]
 
Order Lowpass [1...9]
 
Cutoff Frequency [kHz]
 



Capacitor
   
Resistor [kΩ]
Use next larger value.
Settling Time [ms]
(0.1% to 99.9% Duty Cycle)








✈ Some Design Notes



• Choose a Resistor larger than 330 Ω to avoid heavy loading of the digital output.

• When using more than one stage, an opamp buffer mayst deem useful.

• Try to increase the PWM frequency to achieve a fast settling time.

• Read this Application Note from Allegro microsystems.





Jump from 40% Duty Cycle to 80% causes the DC to rise. Tested with Arduino™. Lowpass first order. R = 15 kΩ, C = 330 nF, F = 976.5 Hz.




✈ Share your thoughts



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t1 = 6585 d

t2 = 231 ms

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