Hello there.
I am working with a adj. voltage regulator (LM338K) and here's what it says in one of the selections:
Thanks much in advance!!! Pdf of LM338K attached.
I am working with a adj. voltage regulator (LM338K) and here's what it says in one of the selections:
The question is, if I want to use a regular power transistor to control the current supplied, it needs to be placed just like in a picture, between the 240 ohm resistor and the regulator itself? Or can I just put the power transistor elsewhere in the circuit after that 240 ohm resistor.The LM138 is capable of providing extremely good load
regulation but a few precautions are needed to obtain maxi-
mum performance. The current set resistor connected be-
tween the adjustment terminal and the output terminal (usu-
ally 240Ω) should be tied directly to the output of the
regulator (case) rather than near the load. This eliminates
line drops from appearing effectively in series with the refer-
ence and degrading regulation. For example, a 15V regula-
tor with 0.05Ω resistance between the regulator and load will
have a load regulation due to line resistance of 0.05Ω xIL.If
the set resistor is connected near the load the effective line
resistance will be 0.05Ω (1 + R2/R1) or in this case, 11.5
times worse.
Figure 2 shows the effect of resistance between the regula-
tor and 240Ω set resistor. (attached)
Thanks much in advance!!! Pdf of LM338K attached.
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