Discussion in "Project Doubts" started by    vipinpathakg    May 27, 2015.
Wed May 27 2015, 04:25 PM
#1
UDN2981 IC is not available in local market. please tell me about best alternative for this IC to drive 7x5 LED Dotmatrix.
Thu May 28 2015, 04:53 AM
#2
[Topic moved to Electronics forum]
Thu May 28 2015, 05:06 AM
#3
UDN2981 is an 8-channel driver which can source current required to drive the load. Now If you are looking for an alternative then you can either use a constant current driver and connect it to driver LED matrix or you can use MOSFETs to driver your LEDs.

Alternatively if you can make changes to your design then you can also use ULN2803 on cathode side and 5V on the source side. But this will have big impact on hardware + software.
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Fri May 29 2015, 09:05 PM
#4


UDN2981 IC is not available in local market. please tell me about best alternative for this IC to drive 7x5 LED Dotmatrix.

vipinpathakg


This type of "high side driver" is quite uncommon.
If the UDN2981 IC is not available in your local market
the alternatives probably aren't either.
You could replace each gate with drivers made using individual
transistors.
Take a look at this page for an outline of the principles and problems.
http://jeelabs.org/2012/11/12/high-side-switching/


I notice the project you ask about runs the LEDs from 5volts.
That would only need a single PNP transistor per 'gate'.


[ Edited Tue Jun 02 2015, 08:41 PM ]
 vipinpathakg like this.

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