PWM to mosfet - using isolator or ? - Page 2

Gerlu · 15th January 2005, 09:13 PM

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 ?

davesaudio · 16th January 2005, 01:14 AM

might want to look at this thread
http://www.diyaudio.com/forums/showt...888#post240888

sivan_and · 16th January 2005, 04:03 AM

A rough schematic...Exact working values will be posted as soon as i get to my home....

Gerlu · 16th January 2005, 08:52 AM

@davesaudio
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

sivan_and · 16th January 2005, 10:51 AM

I would appreciate the particular application needs.
Minimum and Max i/p voltage.
Load Current and output voltage.
Type of load..etc

Gerlu · 16th January 2005, 05:44 PM

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

16th January 2005, 01:14 AM	#12
davesaudio diyAudio Member Join Date: Feb 2003 Location: GTA	might want to look at this thread http://www.diyaudio.com/forums/showt...888#post240888 __________________ intentionally blank

16th January 2005, 10:51 AM	#15
sivan_and diyAudio Member Join Date: Dec 2004 Location: Dxb / India	I would appreciate the particular application needs. Minimum and Max i/p voltage. Load Current and output voltage. Type of load..etc __________________ SivanandBalan

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16th January 2005, 08:52 AM	#14
Gerlu diyAudio Member Join Date: Dec 2004 Location: M.H.	@davesaudio 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

16th January 2005, 05:44 PM	#16
Gerlu diyAudio Member Join Date: Dec 2004 Location: M.H.	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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