I have an OpAmp that has an output voltage of about 24 volt. well, this output is going to drive a motor of high current (about 1.5A with starting current of 5 A) ..
by reading the datasheet of uA741, I found that the max. o/p current is 40mA ..
Is there a suitable IC (and available commercially) that can drive this huge motor and delived the required 5A with the 24V from OpAmp ..??
Isn't the maximum voltage for a uA741 only 22 volts, also it's not a rail to rail opamp so even if run at 24 volts (higher than it's supposed to) it can't provide 24 volts output.
yeah it is 22 volt .. sorry i missed this .. ok no problem this can be solved easily i can reduce o/p voltage (over reducing motor speed) but the o/p current problem has to be solved .. so i am still asking for the driving IC ..
Most opamps including the lousy old 741 opamp have a max allowed supply of 36V.
But if you use a high power amplifier then when the voltage to the motor is 18V the heating in the amplifier is the same as the heating in the motor. 18V x 2.5A= 45W which is a lot of heat for an amplifier.
That is why Pulse-Width-Modulation is used to vary the speed of powerful motors on wheelchairs and golf carts so that the electronics stays cool.
A mosfet as a voltage follower. You'll have to deal with the fact that at low voltages the mosfet will be burning a lot of power though, especially if the motor is stalled.
What's your electronics background because doing something like this is something they cover in school.
ok i will search for speed control using PWM .. thanks alot ..
ost opamps including the lousy old 741 opamp have a max allowed supply of 36V.
But if you use a high power amplifier then when the voltage to the motor is 18V the heating in the amplifier is the same as the heating in the motor. 18V x 2.5A= 45W which is a lot of heat for an amplifier.
That is why Pulse-Width-Modulation is used to vary the speed of powerful motors on wheelchairs and golf carts so that the electronics stays cool.
oh by the way .. if u don't like to reply or answer my questions it is up to u, but if u did u shouldn't underestimate forum members in this manner !! did u understand ..?or they don't teach how to speak politely with people in ur school ..?
afesheir, I was asking what your background in electronics was, the fact that you took that personally is your own problem, leave it out of the forum, ***** at me in private mesages if you want. It was a very valid question.
I understood the question as underestimating me (they cover in schools) but anyway if u don't mean this, forget what i said and forgive my aggressive accent ..
for my background .. I am studying electronics in my faculty but my most interrest is in computer network and communications so I have some poor knowledge of electronics and that is why I participate in this board ..