L293D Motor controller (the one from the Professional Development Board)

FrannyFranny Posts: 127
edited 2015-12-31 - 13:27:24 in Accessories
Howdy,
I noticed that motor controllers usually come with extra components and so I was wondering if it's safe to use the L293D just by itself kinda the way it's setup within the Parallax Professional Development Board?
Parallax Propeller SimpleIDE C/C++ Youtube Channel
https://www.youtube.com/channel/UCh91LUTQg1FLKB7r5yyRCHg

Comments

  • I'm thinking you are asking about the diodes that protect from inductive "kickback". The L293D includes them.
    Re-inventing the wheel is not a waste of time if, when you are done, you understand why it is round.
  • I have switched to the TI SN754410. Higher Peak Output Current (2000ma as opposed to 1200ma on the L293D) and broader operating temp range (-40c-85c as opposed to 0c-70c on the L293D, at least the TI versions). The SN754410 is also cheaper than the STM part. I just paid $1.65 at Mouser for mine. STM part was $5.12.

    Did I mention same pinout. Drop in replacement.
    Infernal Machine
  • Publison wrote: »
    I have switched to the TI SN754410. Higher Peak Output Current (2000ma as opposed to 1200ma on the L293D) and broader operating temp range (-40c-85c as opposed to 0c-70c on the L293D, at least the TI versions). The SN754410 is also cheaper than the STM part. I just paid $1.65 at Mouser for mine. STM part was $5.12.

    Did I mention same pinout. Drop in replacement.

    The SN754410 is better than I thought. I thought it topped out out at 1000ma. Mine do not say "TI" however.
    Larry

    If the grass is greener on the other side...it's time to water your lawn.
  • I'm thinking you are asking about the diodes that protect from inductive "kickback". The L293D includes them.

    So basically this chip can be used as a motor controller just by itself?
    Parallax Propeller SimpleIDE C/C++ Youtube Channel
    https://www.youtube.com/channel/UCh91LUTQg1FLKB7r5yyRCHg
  • Franny wrote: »
    I'm thinking you are asking about the diodes that protect from inductive "kickback". The L293D includes them.

    So basically this chip can be used as a motor controller just by itself?

    Yes, as long as you stay within the voltage, current, and power ratings of the chip.
    In science there is no authority. There is only experiment.
    Life is unpredictable. Eat dessert first.
  • Thanks everybody!

    PS. How do you know when to put a heat sink, what's the temp threshold?
    Parallax Propeller SimpleIDE C/C++ Youtube Channel
    https://www.youtube.com/channel/UCh91LUTQg1FLKB7r5yyRCHg
  • The formal method would be by measuring or calculating the power dissipation and basing it on the power curves on the data sheets (P 12 of my sheets).

    A less formal method is to run it and add a heat sink if it gets hot enough to shut down or put a blister on your finger tip.
    In science there is no authority. There is only experiment.
    Life is unpredictable. Eat dessert first.
  • Yeah, I always use the rule of thumb. If you can keep a thumb on it, it is okay.
    Re-inventing the wheel is not a waste of time if, when you are done, you understand why it is round.
  • The rule of thumb definitely works for me! Thanks y'all
    Parallax Propeller SimpleIDE C/C++ Youtube Channel
    https://www.youtube.com/channel/UCh91LUTQg1FLKB7r5yyRCHg
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