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h-bridge help

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phobos

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I am havening ruble finding a H-bridge ic that can handle the amps to run a 14.4v drill motor. I would prefer to be able to get free samples. Thanks for any help.
 

petrv

New Member
If you cannot find an integrated h-bridge for your needs (high current) you can build one from 4 N-channel MOSFETs and a H-bridge mosfet driver IC like for example HIP4082 (Intersil - they have also appnotes for using this IC). This way you are mainly limited by current the MOSFETs are able to handle.
 

phobos

New Member
I don't know the current is rite now I'm trying to find out the cost, I have vary little money for these protect.
 

petrv

New Member
you cannot design your h-bridge without knowing the current. You should know both normal operating current of the motor and also the stall curent (which can be significantly higher). You can try to measure it if you don't know the current.
 

manymany

New Member
I am a newbie...

Hi..

I wanted to post a new thread but cannot cos I'm new here, so hope you don't mind i post here?

I am using this L293 H-bridge to drive my DCmotor. From the attachment, lets say my circuit is similar to that, the left motor. The ENABLE pin 1 is on, and i've PWM of 30% on, 70% off, into pin 2. The inverted 30% off, 70% on into pin 7. The 2nd attachment shows my outputs (are they wrong? should they be mirror image?).

But I do not understand how this works. The DC motor only rotates when either 1-0 or 0-1 at the 2 outputs? And whether its 1-0 or 0-1 determines its direction of rotation?

If the 2 waveforms are mirror images, then the motor rotates in direction A for 30%, then rotates in opposite direction for 70%, and so on?
 

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