AnsweredAssumed Answered

L6474 overtemperature

Question asked by Ma Ser on May 28, 2018
Latest reply on Jun 4, 2018 by Enrico Poli


i'm using the steval 3d printer board as prototype for my project, i need to use NEMA 23 motors and hold in torque for some time (even hours).

after 1 or 2 minutes the l6474 return overtemperature error, and remove the power from the motor.

i note this:

l6474 ia about 70-80°C 

the bootstrap circuit overheat until 120°c, in particular the capacitor C_FLY is 125 deagrees.


i set this parameters:

TON_MIN = 4 us
TOFF_MIN = 21 us
TOFF_FAST = 10 us
FAST_STEP = 16 us
TSW = 44 us


but the temperature don't change.


can you help me?


Thanks in advance