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Old 1st February 2010, 08:13 PM   #1791
wheezer is offline wheezer  United States
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Would it be possible to get the schematic of a working version good for around 20Vin and just the CCS portion?
Thanks,
W
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Old 1st February 2010, 08:22 PM   #1792
Salas is offline Salas  Greece
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What exactly? Positive side V1.0? What current?
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Old 1st February 2010, 10:32 PM   #1793
wheezer is offline wheezer  United States
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Ooooops...me bad.
Positive rail and about 400mA.
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W
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Old 1st February 2010, 10:58 PM   #1794
Salas is offline Salas  Greece
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9 to 13Vout it can be good for, with 20Vin. Is that OK? Also is the load less than the 400mA CCS you specified?
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Old 1st February 2010, 11:02 PM   #1795
wheezer is offline wheezer  United States
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Quote:
Originally Posted by Salas View Post
9 to 13Vout it can be good for, with 20Vin. Is that OK?
Perfect
Quote:
Also is the load less than the 400mA CCS you specified?
No.

Thanks,
W
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Old 2nd February 2010, 02:44 AM   #1796
Salas is offline Salas  Greece
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Use a LEDS CCS V1.0 schematic. You just need to use low R1 for a current at least +20% of your (substantial) 400mA load. Depending on your LED Vf you must have 5W loudspeaker crossover style sandcast resistors maybe 3R3 or 4R3. The voltage across them divided by their value will give you the actual running current. Use 3K3 trimmer in the Vref, adequate sinking, and you will be ready.
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Old 2nd February 2010, 06:21 PM   #1797
wheezer is offline wheezer  United States
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Salas,
Thank you very much for the detail and specifics for my application.
It took a bit of time to find this; I assume this is V1.0:
The simplistic Salas low voltage shunt regulator
Thank You,
W
Attached Files
File Type: pdf 37vshunt.pdf (10.3 KB, 174 views)
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Old 2nd February 2010, 07:11 PM   #1798
Salas is offline Salas  Greece
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As in your pdf is the Leds controlled CCS which is more helpful with the resistor values for the current range you asked for. The trimmer goes where the Zener is. Follow post #1796 above for your needs.
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Old 3rd February 2010, 01:55 PM   #1799
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Salas,
Since IRFP240 is in back order, what is the best direct replacement for IRFP240 and IRFP9240?

Thank you.
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Old 3rd February 2010, 02:53 PM   #1800
Salas is offline Salas  Greece
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IRFP140 and IRFP9140
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