drive a stepper motor by L6208

[Jo_Jo]

hello,

now i am doing a project. it is driving a stepper motor by L6208.
the datasheet of L6208 said that it can support a current 5.6A, but now, it only support 1A.well the torque is not enough. if i want a higher torque, what should i do.
P.S.:my circuit is samilar with the one supplied by the datasheet.
thank you for your useful help!

[Jo_Jo]

hello everyone
i have another question. how to confirm the value of the resistance and the capacitor on the RC PIN, thank you for your help!
here is the datasheet of L6208:http://www.st.com/stonline/books/pdf/docs/8607.pdf

[NC Cams]

The chip appears to be designed to drive a very small motor - it does not appear to be "adaptable" to anything other that what it was designed to drive.

If you need to drive 5.6 amps, you'd better find a different driver chip and plan to make an external H bridge motor driver. Perhaps a UC3637 might be configureable to do the driving and could be better suited to do what you want to do.

Another option would be to look for a different driver (UC3637 maybe) or one that could interface with an IR2184 mosfet driver. A pair of the 2184's can create an H bridge driver that, when properly confifured with IRLZ40 or IRFZ40 fets, could easily drive 5 or more amps.

There was a link somewhere on this website to an Atmel based servo amp. The device was designed by "Electronic Lives Mfg." and the schematics were offered for free download. I don't have the link anymore. The device is listed on one schematic as an "SMC3". You could easily adapt some or all of the SMC3 cirtuit to your application.