M
[email protected]
- Jan 1, 1970
- 0
I have a circuit where I need about 300ma at 10v regulated and a raw
voltage of about 19v that I can feed to the input of the LM317T.
I know for the regulator to do it's job, you need around 3v or so
higher at it's input but I always wanted to know....
Other than the heat generated from the voltage drop, is there any
reason NOT to feed an excessive voltage to the input, as long as the
317 can take it and everything is seemingly alright?
Or is it better design practice to put in a series resistor and drop
the input voltage to a lower level?
Is there a maximum limit on input voltage or is just a factor of what
the 317 can dissipate in heat?
I have the 19v because I just happened to have a transformer that is
"more than I need"......don't want to buy another one.
voltage of about 19v that I can feed to the input of the LM317T.
I know for the regulator to do it's job, you need around 3v or so
higher at it's input but I always wanted to know....
Other than the heat generated from the voltage drop, is there any
reason NOT to feed an excessive voltage to the input, as long as the
317 can take it and everything is seemingly alright?
Or is it better design practice to put in a series resistor and drop
the input voltage to a lower level?
Is there a maximum limit on input voltage or is just a factor of what
the 317 can dissipate in heat?
I have the 19v because I just happened to have a transformer that is
"more than I need"......don't want to buy another one.