Combining PWM and PFM

Status
Not open for further replies.
T

tsmitht0229

Newbie level 2
Joined
Feb 18, 2016
Messages
2
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
15
I am new to 555 timers and circuit design. I am trying to figure out a way to control the duty cycle and frequency. I need a controllable frequency from 15kHz to 60kHz and to be able to adjust the duty cycle for motor speed control. Is this possible?
 

The 555 has a 'ctl' pin. By applying a voltage, you change duty cycle. At the same time it changes frequency. If you're lucky the resulting waveform will suit your purpose.



Also check out this collection of 555 circuits.

**broken link removed**
 
Reactions: tsmitht0229

    V

    Points: 2
    Helpful Answer Positive Rating
    T

    tsmitht0229

    Points: 2
    Helpful Answer Positive Rating
The speed adjust on the motor datasheet says the PWM frequency of 15kHz-60kHz, 2.3-5VDC. So I have made a circuit to adjust duty cycle but I think I still have to adjust frequency. Is the correct?
 

If it's a DC motor then it doesn't care about frequency,
it either will be filtered (LC) or self-filtered (motor L).
 
Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…