topic Re: MC34844 Current Mirror Error Reduction in Other NXP Products

MC34844 Current Mirror Error Reduction

elizabeth_lee — Tue, 25 Aug 2020 20:42:23 GMT

I'm trying to drive 4 strings of LEDs at near-constant current using the MC34844. Is it possible to improve the current mirror error on the MC34844 from the +/-2% on the datasheet?

For instance, connecting 2 channels to each string of LEDs to 'average out' the error? Or adding peripheral current sense feedback?

Or are there any recommendations on driving 4 strings of LEDs, near-constant current, adjustable from 0-30mA?

Thanks!

Re: MC34844 Current Mirror Error Reduction

guoweisun — Thu, 27 Aug 2020 01:17:24 GMT

Please get note that the current error accuracy is fixed inside of IC,you can't modify!

Re: MC34844 Current Mirror Error Reduction

elizabeth_lee — Thu, 27 Aug 2020 17:39:41 GMT

Thanks for the reply! Is there no external circuitry I can design to reduce the error?