Mosfet problems

[Luciano]

Hi Nick,

Use a Logic level PowerMOS transistor BUK101-50DL or BUK101-50GL.
The BUK101 has built-in overload protection against short circuit load.

(Logic level = You can drive it directly with an I/O of the PIC).

Datasheets:
http://www.nxp.com/acrobat_download/...101-50DL_1.pdf
http://www.nxp.com/acrobat_download/...101-50GL_1.pdf

Best regards,

Luciano


(Click to enlarge the picture)

[Agent36]

Hi,
Thanks for the info on the mosfets, I will try and find a stockist in the uk. My usual stockists RS and RAPID dont seem to hold them.

Kind regards Nick

[Luciano]

Hi Nick,

www.conrad.com (Select UK flag)

BUK 101-50 GL
Part no.: 157996
£4.69

Note that the BUK100-50GL will also work. (13.5 A)
Part no.: 157988
£1.50

BUK100-50GL Datasheet:
http://www.nxp.com/acrobat_download/...100-50GL_1.pdf

* * *

Make sure you don't buy the "GS" version because the input
it is not logic level 5V.

Best regards,

Luciano

EDIT:

See this link:
http://www.donberg.ie/descript/b/buk_101-50gl.htm

[Agent36]

Hi Luciano,
Thanks for taking the time to post the links to that website, I was just about to get a copy of Every day practical electronics out and check the listings for a stockist of those fets, you have saved me the trouble. I will be ordering a few to test in my application. Out of interest what frequency would be best for DC motor control? At present I have set the HPWM frequency to 7000Hz to remove the noise from the motor windings. I am sure that I have read somewhere that the frequency of the mark to space ratio has a direct effect on the torque and efficiency of the motor.

Thanks for your help. Kind regards Nick