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H-bridge chip selection

Posted by strikom

strikom

H-bridge chip selection
July 31, 2012 07:18AM

Registered: 11 years ago
Posts: 7

Hi, I am new with the stepper motor interfacing circuits and I was looking online and came across quite a few. I just wanted to know whether I should be aware of any issues with using an Allegro UDN2988 H-bridge chip to drive a bi-polar stepper motor using a PIC 16F84 microcontroller.

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strikom

Re: H-bridge chip selection
July 31, 2012 07:27AM

Registered: 11 years ago
Posts: 7

Correction : thats UDN 2998

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nophead

Re: H-bridge chip selection
July 31, 2012 08:14AM

Admin
Registered: 17 years ago
Posts: 7,879

It should work with a 5V PIC but it will only give full or half stepping constant voltage drive. If you are using this for a RepRap you will want microstepping and constant current drive.

It is also classed as obsolete by the manufacturer.

Edited 1 time(s). Last edit at 07/31/2012 08:15AM by nophead.

[www.hydraraptor.blogspot.com]

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strikom

Re: H-bridge chip selection
July 31, 2012 08:20AM

Registered: 11 years ago
Posts: 7

Can you please suggest any alternative ICs that i can instead

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nophead

Re: H-bridge chip selection
July 31, 2012 09:13AM

Admin
Registered: 17 years ago
Posts: 7,879

Most repraps use modern Allegro chips like A4988 but, because it is surface mount, tend to buy them ready mounted: [www.pololu.com].

Those that prefer to solder their own or want a bit more current use the Toshiba TB6560AHQ but it has some nasty power cycling requirements that most people ignore.