There is no USPS pickup on Monday Feb 15th, 2016 because of President's Day. USPS orders placed after 11am EST Fri February 12th will go out Tuesday February 16. UPS orders will ship as normal.

[Motor Shield] Can I drive (2) 1.7A/phase steppers by piggybacking (3) L293Ds (total of 6 chips)?
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

[Motor Shield] Can I drive (2) 1.7A/phase steppers by piggybacking (3) L293Ds (total of 6 chips)?

by metrogdor22 on Sun Nov 11, 2012 1:42 am

I need to drive 2 of these bipolar stepper motors (3v, 1.7A/phase):
https://www.sparkfun.com/products/10846

If piggybacking 2 L293Ds yields 1.2A/phase, 2.4A total (per motor), then would piggybacking 3 yield 1.8A/phase, 3.6A total (per motor)? Assume proper heat-sinking.
metrogdor22
 
Posts: 2
Joined: Mon Aug 13, 2012 4:31 pm

Re: [Motor Shield] Can I drive (2) 1.7A/phase steppers by piggybacking (3) L293Ds (total of 6 chips)?

by adafruit_support_bill on Sun Nov 11, 2012 6:46 am

There are diminishing returns when stacking chips due to several factors - including heat dissipation. You might be better off with 2 SN754410s and a heat-sink. See the "I need more power!" section of this post: viewtopic.php?f=31&t=26873
Image

adafruit_support_bill
 
Posts: 45746
Joined: Sat Feb 07, 2009 10:11 am

Re: [Motor Shield] Can I drive (2) 1.7A/phase steppers by piggybacking (3) L293Ds (total of 6 chips)?

by metrogdor22 on Sun Nov 11, 2012 9:40 am

Thanks! I will try that, and will update this post with the results. Also, I couldn't find the heatsink on Aavid's website, so I found it on Digikey for anyone else interested:
http://www.digikey.com/product-detail/e ... -ND/228497
metrogdor22
 
Posts: 2
Joined: Mon Aug 13, 2012 4:31 pm

Please be positive and constructive with your questions and comments.