About 74HC595 + ULN2803 Multiplexing 16x8 12v load

Other Hardware LEDs and Multiplexing
1

The following image is what i want to do:
http://dl.dropbox.com/u/1398533/SECOND_SKIN_TEST/uln2803Qs1.PNG

but unfortunately " ULN2803 " can't do this.

ULN2803 are common ground but i want to separate each ground,

any suggestion~~~~~!!

Thanks all Duino's.

2

If you wan't PNP darlingtons arrays you might try to get the Allegro's 2981 or the M54580P (that lacks the protection diodes).

3

Thanks pgmartin :slight_smile:

I look up datasheet that each output of current "500 mA output source current capability" it means each channel 500ma or total of ch?

thanks all.. :slight_smile:

4

I have no direct experience with this particular IC, but I'd guess is 500mA for the total.

5

No it is 500mA per channel BUT the total switched at any one instant is about 650mA due to power dissipation limits on the package.

6

Grumpy_Mike:
No it is 500mA per channel BUT the total switched at any one instant is about 650mA due to power dissipation limits on the package.

This is a much better explanation.

7

Thanks pgmartin & Grumpy_Mike.. :slight_smile: i got it