Is there supposed to be a voltage drop after lm317t regulator (14volt as it input)..

Papabravo

Joined Feb 24, 2006
17,646
There will be a voltage drop across the regulator. This voltage drop times the current through the regulator is converted to heat, raising the temperature of the regulator. If the load has a low impedance, then the regulator may reduce the output voltage further, so that the output power will always be less than the input power.
 

crutschow

Joined Mar 14, 2008
28,580
The minimum voltage drop is 2-3V.

If you need to have less than that, you need a LDO (Low Dropout Regulator).
 
Last edited:

DickCappels

Joined Aug 21, 2008
8,180
The National/TI specification says the recommended operating condition is when Vin = Vout + 3V to + 40V. Any outside this range and you are on your own.
 
Top