Power Amplifier - Electronic Circuits Projects Diagrams Free

Ermir · 5th November 2003, 10:34 PM

Hello everyone.
I'm building a power amplifier but I need some help with that.
Power Supply input +-30V

The PA is supposed to drive a motor and the output of it must be as below:
Output
--------
+-25V
5 A
125 W

I also need a preamplifier so the motor will not have all the 25 volt imediately. On the top of the motor is a heavy load so it has to rotate slowly (ramp) till it reaches the 25 V in 1 sec.

Any idea what to use for the power amplifier?
I was using a HC2000H from RCA but I couldn't find the datasheet for that so I can't use it anymore.

Thanks in advance.

motion · 6th November 2003, 01:45 AM

Instead of using a linear PA, you should consider using a PWM mode circuit.

The LMD18245 is an example device that I can think of at the moment. The LMD18245 is rated below your requirement but there are other similar drivers out there that should fit your needs.

Ermir · 6th November 2003, 07:40 AM

Thanx for replying. I checked it and also some other controllers that were in that page, but none of them would meet the specifications.
If you have any other idea, please let me know.

Cheers.

Ermir · 11th November 2003, 08:58 AM

So no one can help me?

motion · 11th November 2003, 11:23 AM

Go visit the IRF site and see if any of the modules fits your needs.

http://www.irf.com/

http://www.irf.com/whats-new/nr030722.html

You can also try ST-Micro site:

http://www.st.com/stonline/books/ascii/docs/1373.htm

To get higher current, you can try connecting the L6203 in parallel.

With the power level you're looking for, discrete devices are more common.

Ermir · 11th November 2003, 11:33 AM

Thanx for the links. I found another IC that can do the job. MSK 2541. Is a dual high power op-amp.http://www.mskennedy.com

Have fun.

David Creel · 17th November 2003, 04:03 AM

I have a data sheet for the HC2000H. Let me know if you would like a copy.

Quote:

Originally Posted by Ermir

Hello everyone.
I'm building a power amplifier but I need some help with that.
Power Supply input +-30V

The PA is supposed to drive a motor and the output of it must be as below:
Output
--------
+-25V
5 A
125 W

I also need a preamplifier so the motor will not have all the 25 volt imediately. On the top of the motor is a heavy load so it has to rotate slowly (ramp) till it reaches the 25 V in 1 sec.

Any idea what to use for the power amplifier?
I was using a HC2000H from RCA but I couldn't find the datasheet for that so I can't use it anymore.

Thanks in advance.

Ermir · 17th November 2003, 08:03 AM

Well, I would like to have a copy of the datasheet. I've been looking all the net but no results, till now. I guess the IC is too old.

Thanx.

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5th November 2003, 10:34 PM	(permalink)
Ermir	Power Amplifier Hello everyone. I'm building a power amplifier but I need some help with that. Power Supply input +-30V The PA is supposed to drive a motor and the output of it must be as below: Output -------- +-25V 5 A 125 W I also need a preamplifier so the motor will not have all the 25 volt imediately. On the top of the motor is a heavy load so it has to rotate slowly (ramp) till it reaches the 25 V in 1 sec. Any idea what to use for the power amplifier? I was using a HC2000H from RCA but I couldn't find the datasheet for that so I can't use it anymore. Thanks in advance. __________________ Life is short. Make the best of it!

6th November 2003, 01:45 AM	(permalink)
motion	Instead of using a linear PA, you should consider using a PWM mode circuit. The LMD18245 is an example device that I can think of at the moment. The LMD18245 is rated below your requirement but there are other similar drivers out there that should fit your needs. __________________ "Having to do with Motion Control"

6th November 2003, 07:40 AM	(permalink)
Ermir	Thanx Thanx for replying. I checked it and also some other controllers that were in that page, but none of them would meet the specifications. If you have any other idea, please let me know. Cheers. __________________ Life is short. Make the best of it!

11th November 2003, 08:58 AM	(permalink)
Ermir	So no one can help me? __________________ Life is short. Make the best of it!

11th November 2003, 11:23 AM	(permalink)
motion	Go visit the IRF site and see if any of the modules fits your needs. http://www.irf.com/ http://www.irf.com/whats-new/nr030722.html You can also try ST-Micro site: http://www.st.com/stonline/books/ascii/docs/1373.htm To get higher current, you can try connecting the L6203 in parallel. With the power level you're looking for, discrete devices are more common. __________________ "Having to do with Motion Control"

11th November 2003, 11:33 AM	(permalink)
Ermir	Thanx for the links. I found another IC that can do the job. MSK 2541. Is a dual high power op-amp.http://www.mskennedy.com Have fun. __________________ Life is short. Make the best of it!

17th November 2003, 08:03 AM	(permalink)
Ermir	Well, I would like to have a copy of the datasheet. I've been looking all the net but no results, till now. I guess the IC is too old. Thanx. __________________ Life is short. Make the best of it!