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| sg3532j psu |
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| m3vuv:
Hi all,im looking for some help,i was going to try and build a psu using a lm723,instead i just brought a sg3532j ic,it looks better as the current sense needs only 80mv as oposed to the 600mv of the 72,the issue i have is i cant find a schematic,any ideas?,cheers m3vuv. |
| m3vuv:
I was just looking,would the attached schematic work if i played with the current sense resistor values to suit?,looking at the datasheets for the 723 ic and the sg ic the pinouts are pretty much identicle!. regards m3vuv,ps the sg chip was quite expensive so dont want to fry it! |
| m3vuv:
well to give you a clearer pic of what i have and am trying to do,i have 10x 2n3773 pass transistors to use in place of the 3055's also a mc342p over voltage ic,the crowbar part etc is no probs,ive used the schematic i posted in the last thread before and had r8 switched between 120 ohm and 10k,that gave me 2 ranges going from about 3v low to about 28v high,in that one i used 6x pass transistors,the current foldback range didnt start untill about 5 amps,the 723 needs .6v to go into current foldback,the sg 80mv,im trying to build a psu that goes from about 3v to 30v say in 2 ranges and current limits from say 300ma to 30a,againe in say a high and low range,basicaly using the cct attached but with my own mods to it and using the sg ic,i see no reason why its not doable,my transfo is good for about 60a and my bridge rectifier is good for 180a,regards m3vuv. |
| m3vuv:
didnt realise i was asking the imposible!,im supprised!! |
| David Hess:
The SG3532 is an improved LM723 but not a drop in replacement. |
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