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Old 23rd August 2011, 02:40 PM   #301
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Quote:
Originally Posted by Salas View Post
You can use down to 2u2 Zobel cap on BJT when you will inevitably do your usual Merlinesque subjective experiments. But no less than 4u7 when with MOSFET output on other regs. No bigger than 10uF in both cases do any good, rather restrict bandwidth. If there are decoupling capacitors in parallel with the reg output on circuits served, they can be changing the reg's parameters. They can be buffered with a central 100R in series at the +V input point on the client circuits PCB and hear if its better. That will form a mini RC, cutting enough interaction with the SSLV termination. Don't simply delete any of those local capacitors on digital circuits or linear op amps rails, they are usually critical for the chips.
Thanks for the tweak, I have problems to get targeted Vout +3.3V

-Tx 9VAC 1A
-Vref 1red LED + 1K trimmer, rest jumpers
-R306 27R
-Smoothing cap 4700uF 16V
-R301 12R (Vout +0.696) trimmer don't adjust the Vout is fixed +0.696V) I tried with R310 3R9 (Vout +1.57) but still trimmer don't adjust the Vout is fixed 1.57V
-Dummy load 6R8

Pic show +1.57Vout with all LEDs lit but when changed R310 to 12R the red LED don't lit
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Old 23rd August 2011, 03:00 PM   #302
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Too heavy a dummy load. Should be drawing half your CCS to 3/4 is correct. Use a 15R 2W-5W dummy to emulate ~220mA draw, set for 350ma to 450mA CCS. Check voltage drop across R301 to estimate what current you have available to use.
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Old 23rd August 2011, 04:20 PM   #303
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15R 5W dummy load
Vout +1.52V still can't adjust Vout with the trimmer
Voltage across R301 12R (+1.22V)
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Old 23rd August 2011, 04:24 PM   #304
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This way you got 100mA only. Go down 2.7R R301, keep the dummy @ 15R.
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Old 23rd August 2011, 04:50 PM   #305
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R301 2R7 (voltage across 0.81V = 300mA)
Vout 3.3V

Now YES: trimmer adjust Vout & all LEDs lit strong

Time to compare vs Trident TP stuff
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Old 23rd August 2011, 05:05 PM   #306
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Is the real circuit's constant consumption about 200mA?
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Old 23rd August 2011, 05:08 PM   #307
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Trident max Iout 100mA
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Old 23rd August 2011, 05:13 PM   #308
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You will have to know what the circuit draws without Tridents since you are about to check without them. I have read that a Buff 2 draws 410mA with Tridents on it. Anyway, keep in mind to have whatever it needs in the end +100mA in CCS reserve. If it takes 200mA for instance, you are OK with 300mA.
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Old 23rd August 2011, 05:23 PM   #309
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I lowered R301 till 2R2 so now I have 330mA, I will do the comparison vs the Trident clock regulator
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Old 23rd August 2011, 05:27 PM   #310
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I am not Russ to surely tell you what consumes how much in those modules, but I trust you will make it out in practice. Its shown that your reg works when the currents are at correct proportions, that's enough to start. Good luck.
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