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Old 27th September 2003, 01:22 PM   #111
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I am still wondering if there is a reason you don't want to use the error amp in the SG3524 to control the pulse duration. You might as well just use a multivibrator like a '555 in this application if not.
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Old 28th September 2003, 09:02 AM   #112
MaXiZ is offline MaXiZ  Italy
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Subwo1...
What maybe the reason for which if i connect a real load (a power amp for example) the voltage goes quicly down? From +/-42V to 0.5-1V???
I don't think that's normal...
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Old 28th September 2003, 01:10 PM   #113
MaXiZ is offline MaXiZ  Italy
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Quote:
I am still wondering if there is a reason you don't want to use the error amp in the SG3524 to control the pulse duration. You might as well just use a multivibrator like a '555 in this application if not.
Ok explain me how i should modify my schematic to make this!
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Old 28th September 2003, 02:53 PM   #114
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actually maybe for Image6a.jpg R7=R8=R9=R10=0 & R5=R6=10 UP TO 100ohm.
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Old 28th September 2003, 05:30 PM   #115
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Quote:
Originally posted by MaXiZ

Ok explain me how i should modify my schematic to make this!
and perhaps you would like to use the current sense on the LM3524 next. At any rate, here's how to control the pulse width using the error amp.

voici:
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File Type: jpg image6a copy.jpg (52.3 KB, 447 views)
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Old 28th September 2003, 09:30 PM   #116
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and what about this?
Click the image to open in full size.
And 2.5V mean that i should regulate the trimer to have 2.5V ad pin1?
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Old 29th September 2003, 05:04 AM   #117
subwo1 is offline subwo1  United States
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What the 2.5V means is that is what you see there when the circuit is regulating correctly after adjusting the potentiometer jackinnj showed you in his circuit. You adjust the potentiometer to get the 37.5V on the B+ output.

The picture you just showed shows the current limit resistor and how it is used. It goes between the sources of the power mosfets and ground.
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Old 29th September 2003, 05:47 AM   #118
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Hi all
if it's caraudio PS then GND primary & secondary must be "ISOLATED" & voltage feedback better be isolated too by opto device.
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Old 29th September 2003, 04:29 PM   #119
MaXiZ is offline MaXiZ  Italy
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Quote:
if it's caraudio PS then GND primary & secondary must be "ISOLATED" & voltage feedback better be isolated too by opto device.
Do u mean this?
R12 and A4N35 section?
OR what do u suggest to Isolate Primary GND and Secondary GND?
Click the image to open in full size.
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Old 30th September 2003, 04:31 AM   #120
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this design have 12vGND & 37v GND is ok.
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