PWM to mosfet - using isolator or ? - Page 2 - diyAudio
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Old 15th January 2005, 08:13 PM   #11
Gerlu is offline Gerlu  Mexico
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Default Re: pwm

Thanks for the replies

Quote:
Originally posted by raypsi
Your schematic shows 2 grounds, ya?
Yup, 1 power ground and 1 signal ground. But .. why using isolator Both the grounds will be connected at a single point after all.

Quote:
Originally posted by sivan_and
If u are looking for a step down conv,,,Try a single chip solution like MAX 724.
Or SG3524 (both o/p added for max duty cycle.and IR2110 or any high side driver.
Single chip solution is good .. but .. ..
SG3525 featuring soft-start ..
Yup, I think I need a high side driver


Quote:
Originally posted by sivan_and
Even the outputs can be connected directly to MOSFEt w/o isolator,if u r using SG3524 or TL494.Since the IC output transistors collectors and emitters are easily accessible,can be configured freely...
Really !!!?!! Can you show me ?
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Old 16th January 2005, 12:14 AM   #12
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might want to look at this thread
http://www.diyaudio.com/forums/showt...888#post240888
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Old 16th January 2005, 03:03 AM   #13
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A rough schematic...Exact working values will be posted as soon as i get to my home....
Attached Files
File Type: zip driving high side mosfet.zip (50.9 KB, 50 views)
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Old 16th January 2005, 07:52 AM   #14
Gerlu is offline Gerlu  Mexico
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Kind of different but it helps


@sivan_and
SG3524 huh .. umm .. I see the difference .. Will think about it, and thanks Waiting for your next schematic ya
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Old 16th January 2005, 09:51 AM   #15
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I would appreciate the particular application needs.
Minimum and Max i/p voltage.
Load Current and output voltage.
Type of load..etc
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Old 16th January 2005, 04:44 PM   #16
Gerlu is offline Gerlu  Mexico
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Still not figure out the application for it yet, +/- 12V should be useful. Just try to build some converter myself. And to gain some experiences with it.

Input voltage is +25V .. might need zener diode or diode here.
Output voltage is -12V (require soft start ?). +12V is ok too.
Resistive load 15ohm. So, load current = 0.8A.
Mosfet p-channel IRF9540 ?

The values above are not fixed.
Vi = 12V Vo = 5V R = 10 ohm or 15 ohm
are fine too.

And, thanks for your responces
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