LM358: lm358

vvn

Prodigy 50 points

Part Number: LM358

Im trying to convert 5V pwm signal with duty cycle 50%, frequency 100Hz to average voltage.

Can someone suggest a circuit solution?

over 1 year ago

0 kai klaas69 over 1 year ago

Guru 140200 points

Hi Vvn,

with a RC low pass filter? Or two or three cascaded RC low pass filters?

Kai

0 vvn over 1 year ago in reply to kai klaas69

Prodigy 50 points

i found RC filter, also some solution with LM358. Could you pls suggest a solution with minimum ripple

0 kai klaas69 over 1 year ago in reply to vvn

Guru 140200 points

Hi Vvn,

decreasing the ripple of a low pass filters means to increase the settling time at the same time. So you would need to specify the settling time first

Kai

0 vvn over 1 year ago in reply to kai klaas69

Prodigy 50 points

Hi Kai

Do you have any sample circuit?

0 Caro Walter over 1 year ago in reply to vvn

TI__Genius 17637 points

Hey Vvn,

I believe this all about circuits article should help with the issue:

Low-Pass Filter a PWM Signal into an Analog Voltage

It discusses the previously mentioned trade offs by Kai.

All the best,
Carolina

Amplifiers

Amplifiers forum

LM358: lm358

Low-Pass Filter a PWM Signal into an Analog Voltage