david_samtel said:you can't use LM317 for your application since the output power current range of LM317 max is only 1.5A
You may use LM317 TO3 package. But you need to confirm that to regulate the device will require a 3volts margin voltage. Mean if you need 12 volts, the device should be supplied with 15 volts minimum. Too the capacity of TO3 package is 3 amps maximum. If you need more power, you may use a current boost circuit mentioned in the datasheet of LM317. Cheersandrie_20 said:can i use the LM317 to control output power of my 100W SMPS (12Vdc, 8.5A)?