taos
Newbie level 2
l7805 power supply
Hi to all!!!
I have made a board with a microchip (16f876) and a power mosfet IRF3205.
The mosfet drives a 3 A motor using a 24 V DC source. I'm using the PWM output from the PIC (0-5V) to adjust the mosfet from 0-24V. This speed control runs ok, but I'm using a L7805 to convert 24V to 5V to the PIC microcontroller. The IRF3205 is cold but the L7805 is very HOT!!!!. I know that the L7805 can only drive 1A of current but my 2 questions are:
if the mosfet is driven the motor, why the L7805 is hot? (could be hot the IRF3205...)
how can I get cold the L7805?
Thanks for your help, this is my first post.
Regards
Hi to all!!!
I have made a board with a microchip (16f876) and a power mosfet IRF3205.
The mosfet drives a 3 A motor using a 24 V DC source. I'm using the PWM output from the PIC (0-5V) to adjust the mosfet from 0-24V. This speed control runs ok, but I'm using a L7805 to convert 24V to 5V to the PIC microcontroller. The IRF3205 is cold but the L7805 is very HOT!!!!. I know that the L7805 can only drive 1A of current but my 2 questions are:
if the mosfet is driven the motor, why the L7805 is hot? (could be hot the IRF3205...)
how can I get cold the L7805?
Thanks for your help, this is my first post.
Regards