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designing a pwm circuit
- Thread starter larz
- Start date
DickCappels
- Joined Aug 21, 2008
- 10,661
It looks like a well though-out design!
The output transistors might get hot -maybe better to turn around so their emitters are connected to the supply rails which would allow them to be saturated they could saturate (as well as a Darling can saturate). That might require the use of a couple of transistors to drive them.
Current limit such as in the circuit below would be a good idea.
The LM411 is apparently up to the task as far as output current and speed are concerned but its an opamp so you might have to add a little bit of hysteresis to prevent oscillation when switching output polarity.
The output transistors might get hot -maybe better to turn around so their emitters are connected to the supply rails which would allow them to be saturated they could saturate (as well as a Darling can saturate). That might require the use of a couple of transistors to drive them.
Current limit such as in the circuit below would be a good idea.
The LM411 is apparently up to the task as far as output current and speed are concerned but its an opamp so you might have to add a little bit of hysteresis to prevent oscillation when switching output polarity.
