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Ron H

Ron H

Joined Apr 14, 2005
7,063
Audioguru said:
The 50uA to 100uA current for the ADJ pin reduces the output voltage about 0.15V so the actual output voltage is 24.02V (plus and minus a small tolerance).
Click to expand...
Actually, the ADJ pin current flows out of the pin, so it causes the output voltage to be higher than calculated, not lower.
 
Audioguru

Audioguru

Joined Dec 20, 2007
11,248
Lightfire said:
why in it use 630 ohms and not 57.1 (7..2-1.25/10.42)
Click to expand...
What is 10.42?
If the 130 ohm resistor in the first schematic is 120 ohms then its current is 10.42mA, not 10.42A. 10.42mA is 0.01042A.

Then the second resistor value is (7.2V - 1.25)/0.01042A= 571 ohms.
But since the first resistor is 130 ohms then the second resistor is 630 ohms.
 

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