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steper motor driver l297/l298

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blazes16

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i am following the l297 datasheet https://pdf1.alldatasheet.com/datasheet-pdf/view/22436/STMICROELECTRONICS/L297.html and the design in this link https://reprap.org/mediawiki/images/a/ab/Cache-2910951388_0e05a5c7cc.jpg to design a stepper motor driver. i understood all about the functions of the l297 and l298 current chopper, the pin 16 OSC and the other function but I do not understand why there should be a 47Kohm resistor in between the connection of the l297 pin 5 and 8 and the l298 pin 6 and 11 which is the connection between the INH1 to EN1 and INH2 to EN2 as seen in the schematic. can someone explain to me the purpose of the resistor please.
 

I don't see why those resistors should be there. I made several L297/L298 stepper motor controllers for my desktop CNC machine and **broken link removed**. Scroll to the bottom to see the schematic I used for the final version.
 

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sorry. my mistake. there is not any need for the resistor. my problem is actually the stepper motor is not moving after i send pulse and direction and the l298 heats up so fast.
 

Well, there could be a lot of reasons for the motor not turning when you send a pulse. Is it wired correctly? Are you sending it pulses too fast (if you try to make it turn too fast without slowly ramping up the speed, it can stall)?

You need to put a heat sink on the L298, because as you said it gets very hot. It doesn't have to be a fancy heat sink, though; I just bolted on a large piece of aluminum trim channel onto each of the L298's on my stepper motor controllers and that was enough to keep the heat minimal.
 

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thank you. i tried to slowly ramp the speed up and it works. can i know why you used a noise filter on the CW/CCW pin, ENABLE pin and the CLOCK pin? are you using PIC mcu to control the speed?
 


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