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L293d (+L298N) for step motor

Overheating of L293D [closed]

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As soon as I supply 5 V and 2 A to motor driver sheild(CONNECTED TO 2 stepper motor and 1 servo motor), it’s frying up my IC (L293D) . I’m not even able to upload my program, because of this heating. No idea….. Even I tried it with 5 V and 1 A. Same issue.stepper-motorservol293dshareedit  follow  flag asked yesterdaySarin1 New contributor

  • 5Without a schematic I’m assuming you connected everything wrongly so it is no wonder that the circuit doesn’t work. So show the schematic. – Bimpelrekkie yesterday
  • A warm welcome to the site. Please note that it’s not a free design house or on-line technical encyclopaedia, copied out to you on demand. People will help you take the next step if your question shows you’ve already done as much as you possibly could – which yours doesn’t, I’m afraid. Please edit your question and greatly improve it. Show your own work and own findings in considerable detail with a clear schematic, not a photo of a scribble. The schematic tool here is easy to use. The better the quality of your question, the better the quality of the answers it will attract. Again, welcome. – TonyM yesterday
  • If you have a 5 volt 100A power supply is totally separate from what the circuit CONSUMES! You can power a LED that CONSUMES 5 volt 10mA with that power supply and the power supply can deliver 99,99 Amps to other consumers! – Mats Karlsson yesterday
  • Ah, let me see. You might like to let us know if your L293D looks like L298N and have identical pinouts: raspberrypi.stackexchange.com/questions/96258/… – tlfong01 yesterday   
  • 2Does this answer your question? L293, L298 and SN754410 H-bridge drivers on low voltage power supply – Andy aka yesterday
  • If your 293D is fried, you might try 298N: (1) robu.in/…, (2) electronics.stackexchange.com/questions/510755/…. Good luck and cheers. – tlfong01 yesterday    
  • 2@tlfong01 the L298 is only barely better than the 293. Both are terrible and fully obsolete by equally available, lower loss, higher current, lower voltage alternatives. “Arsenic was not good for you? Oh, try this rat poison!” would be a comic way of recommending the 298 to someone who was disappointed about the L293D in 2020. – Marcus Müller yesterday
  • Why so many questions in L293D overheating these days o.O – Mitu Raj yesterday
  • @Marcus Müller, the OP is using L293D to drive a stepping motor. This reminds me I once used L293D and L298N to drive a bipolar stepper. I learned the tricks from an industrial grade CNC driver board, with opto couplers at the front end. I was learning stepping motor then, and I spent one hobbyist week to learn the stepping motor basics, and another week on L297 and 298. Finally I did something like the picture below: / to continue, … – tlfong01 yesterday   
  • This is the schematic. i.imgur.com/UCGCsWp.jpeg. As you can see, L297D is for logical stepping control, so I don’t need to care about power loss etc. I did use L298N then, but Vcc is 36V, and only intermittently activating two coils, so the power loss of dropping 2V Vce(sat) is no problem. And I can replace L298N with the very efficient Infineon BTN7971B in the final phase. PS – From time to time I meet users insisting to use a special dual L297 board. They don’t tell me why they must use L297. I guess they copycat or reverse engineer something, 🙂 – tlfong01 yesterday    
  • 1well, you can do that, but OP is directly talking about a motor driver shield. Also, not quite sure what one would want an L297D for logical stepping control? That’s basically one of the things modern microcontrollers have been optimized for? – Marcus Müller yesterday
  • @Marcus Müller, ah, the beauty of using L297D is that no MCU is needed, in a noisy factory shop floor. Of course nowadays we have powerful STM32, with clever CAN bus etc. But I am just a friendly hobbyist! 🙂 – tlfong01 yesterday   

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