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Old 5th October 2003, 08:28 PM   #21
BrianGT is offline BrianGT  United States
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Here is the schematic that I drew up for the negative version:
Click the image to open in full size.

Does this look correct?

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Old 5th October 2003, 08:30 PM   #22
BrianGT is offline BrianGT  United States
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Here is a the schematic that I drew up for the positive version:
Click the image to open in full size.

Note: These are intended for +/- 15v

I posted this for comparison with the negative schematic.

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Old 5th October 2003, 08:40 PM   #23
andy_c is offline andy_c  United States
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Hi Brian,

Looks like pins 4 and 7 of the AD825 need to be swapped on the negative version. So pin 4 should be connected to the negative output of the negative regulator, with pin 7 grounded.
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Old 5th October 2003, 08:40 PM   #24
BrianGT is offline BrianGT  United States
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Should these two schematics work? They will be about 1" from the actual ICs that they will be regulating, on the same doublesided pcb.

Also, would there be any problems having the +5, +15 and -15 right next to each other? They take up a 3" x 2.1" space for all 3.

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Old 5th October 2003, 08:53 PM   #25
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a 100 nF at the inputpin on the prereg would help......
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Old 5th October 2003, 09:02 PM   #26
BrianGT is offline BrianGT  United States
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Quote:
Originally posted by andy_c
Hi Brian,

Looks like pins 4 and 7 of the AD825 need to be swapped on the negative version. So pin 4 should be connected to the negative output of the negative regulator, with pin 7 grounded.
Thanks, it should be fixed now in the pictures

Anything else?

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Old 5th October 2003, 09:12 PM   #27
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Gentlemen, you are dissecting problem to the " subatomal " plain, and I ask you what is your realy problem ?
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Old 5th October 2003, 09:12 PM   #28
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Brian, check one more time the pre reglator. The regulator should be connected to ground not Vout. The schematics should look EXACTLY the same except for flipped polarities of all parts and pin 7 to gnd and 4 Vout.
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Old 5th October 2003, 09:26 PM   #29
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Default Re: Re: another jung super regulator pcb layout

Quote:
Originally posted by BrianGT

I also made the traces a bit fatter (20mils -> 30 mils), and increased the sizes of the pads for the regulator and mosfet, in order to handle heat dissipation better.
I'll guess you regulator won't handle more than 1 A?

For 35 um copper
Signal traces 15 mils at least, 30 mils good

Power traces 40-100 mils or as much as fits.

Maybe the resistor from ADJ to Vout should be a lower value. Datasheets recommend 220 Ohms, 220-330 Ohms is good.
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Old 5th October 2003, 10:02 PM   #30
BrianGT is offline BrianGT  United States
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Default Re: Re: Re: another jung super regulator pcb layout

Quote:
Originally posted by peranders
Brian, check one more time the pre reglator. The regulator should be connected to ground not Vout. The schematics should look EXACTLY the same except for flipped polarities of all parts and pin 7 to gnd and 4 Vout.

I'll guess you regulator won't handle more than 1 A?

For 35 um copper
Signal traces 15 mils at least, 30 mils good

Power traces 40-100 mils or as much as fits.

Maybe the resistor from ADJ to Vout should be a lower value. Datasheets recommend 220 Ohms, 220-330 Ohms is good.
You are wrong about the regulator connection.

The regulators will be on the pcb with the dac. The 5v one will just be powering the +5 analog side of the dac. The +/- 15v regs will be powering 6 x OPA627BP.

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