Hello friends.
Here's my setup. I have a regulated switching power supply that provides 12VDC @ max of 10A. I connect the LM338 to it with 120 ref. resistor and 340 ohm Adj-Gnd pins of the LM. The output voltage is well regulated and stable (5V), however when I connect my 100 watt 100Ohm adjustable resistor and play around with the resistance (going all the way down to 1 ohm), I never get more than 1.5 amps of output without high voltage drop and never get beyond 2 Amps without voltage drop of whole 4 volts. When I short I get 2.1 amps @ 1.02 volts.
How come does the data sheet state that it can supply up to 7A peak when I can't even get descent 5. I have good heat sink on the LM and ok to touch at all times.
Please help. Thanks!!
Here's my setup. I have a regulated switching power supply that provides 12VDC @ max of 10A. I connect the LM338 to it with 120 ref. resistor and 340 ohm Adj-Gnd pins of the LM. The output voltage is well regulated and stable (5V), however when I connect my 100 watt 100Ohm adjustable resistor and play around with the resistance (going all the way down to 1 ohm), I never get more than 1.5 amps of output without high voltage drop and never get beyond 2 Amps without voltage drop of whole 4 volts. When I short I get 2.1 amps @ 1.02 volts.
How come does the data sheet state that it can supply up to 7A peak when I can't even get descent 5. I have good heat sink on the LM and ok to touch at all times.
Please help. Thanks!!