People Also Liked

From the same member

Last stress test

Posted by Jorge Pereira
5.7A current intake (1.4A per port, enough for 4 stalled LEGO PF L or Train motors)
Posted January 11, 2015
click to rate

Embed  |  1,000 views
4 comments
  • Fernando Correia
    Fernando Correia For which reason do you think you are loosing 10% at each port, each time you add another port into play??
    January 11, 2015
  • Jorge Pereira
    Jorge Pereira Efficiency. Or lack of it. The internal drivers are never linear. Even MOSFET power transistors start deviating after some threshold value. I don't know what driver circuits are used in SBrick but it seems that 3A is the magic number.
    January 11, 2015
  • Fernando Correia
    Fernando Correia Information about drivers here:
    https://social.sbrick.com/wiki/view/pageId/14/slug/hardware-and-firmware-versions
    January 11, 2015
  • Jorge Pereira
    Jorge Pereira Thanks.. The datasheet (http://www.ti.com/lit/ds/symlink/drv8835.pdf) has no charts so I can't say much more. But since they use the same as LEGO PF IR v2 and Philo made a very detailed analysis (http://www.philohome.com/pfrec/pfrec.htm) I noticed that...  more
    January 11, 2015