Calculating current with Vref pin (a4982, a4988, a5984) Good morning.
I recently burn one of my stepper driver and I want to make sure that my calculations are correct.
a4982, a4988, a5984 stepper drivers have the same equation to calculate max current with VREF pin:
ItripMAX = VREF / (8×RS)
Questions:
One stepper driver have 2 bridges with RS = 0.05ohm for each, so i supose put in equation 0.05 or 0.1 ohm ?
Stepper motor can handle 2A of current, this means that ItripMAX shouldn’t cross 1A (because there are 2 bridges) ?
P.S I put 0.65V on VREF
https://reprap.org/forum/read.php?160,821843,821843#msg-821843
Thu, 25 Apr 2019 19:59:53 -0400Phorum 5.2.23https://reprap.org/forum/read.php?160,821843,821917#msg-821917Re: Calculating current with Vref pin (a4982, a4988, a5984)
https://reprap.org/forum/read.php?160,821843,821917#msg-821917
o_lampeStepper Motors, Servo Motors, DC MotorsSat, 12 May 2018 02:54:42 -0400https://reprap.org/forum/read.php?160,821843,821851#msg-821851Re: Calculating current with Vref pin (a4982, a4988, a5984)
https://reprap.org/forum/read.php?160,821843,821851#msg-821851
I have 1.7A motors and stepper driver that i burned (a4982) can handle up to 2A according to doc.
My mistake. :)

Anyway from which current I should use heat sink on stepper drivers ?
Maybe he can handle up to 2A but he needs heat sink above X amount of current ?]]>asrtStepper Motors, Servo Motors, DC MotorsFri, 11 May 2018 04:08:16 -0400https://reprap.org/forum/read.php?160,821843,821848#msg-821848Re: Calculating current with Vref pin (a4982, a4988, a5984)
https://reprap.org/forum/read.php?160,821843,821848#msg-821848
You don't have to half the values or such.

0.65V means 1.65A, which is fine for the stepper, but probably too much for the driver.]]>o_lampeStepper Motors, Servo Motors, DC MotorsFri, 11 May 2018 03:12:42 -0400https://reprap.org/forum/read.php?160,821843,821843#msg-821843Calculating current with Vref pin (a4982, a4988, a5984)
https://reprap.org/forum/read.php?160,821843,821843#msg-821843
I recently burn one of my stepper driver and I want to make sure that my calculations are correct.
a4982, a4988, a5984 stepper drivers have the same equation to calculate max current with VREF pin:

ItripMAX = VREF / (8×RS)

Questions:
One stepper driver have 2 bridges with RS = 0.05ohm for each, so i supose put in equation 0.05 or 0.1 ohm ?
Stepper motor can handle 2A of current, this means that ItripMAX shouldn’t cross 1A (because there are 2 bridges) ?

P.S I put 0.65V on VREF]]>asrtStepper Motors, Servo Motors, DC MotorsFri, 11 May 2018 01:26:50 -0400