LED1202 LED Driver - Is it possible to combine 2 outputs to drive a LED with a higher current than 20 mA ? Is there anything special to consider in hardware or software if it is possible ?

SGaud.2 · ‎2021-06-30

SBEN .2 · ‎2021-07-01

Hello @SGaud.2 ,

The led outputs of LED1202 are current sinks, and it wouldn't be wise to common current sinks. Adding a Darlington array could solve your issue.

Best regards,

@SBEN .2

SGaud.2 · ‎2021-07-05

Hello,

Thanks for the reply.

I had seen some other led drivers that were currents sinks and it was possible to put them in common.

So, what is different with your device ?

I have to say that I do not plan tu use PWM dimming but only analog dimming.

Thanks

Stephane

SBEN .2 · ‎2021-07-05

Hello @SGaud.2 ,

My comment is not specific to LED1202. The issue is that it's nearly impossible to have consistent results when chaining multiple current sinks when they operate digitally (relatively low frequency PWM for example) as the phase between the sinks is generally not guaranteed to be uniform (LED1202 supports phase shifting). Otherwise, here is a screen shot from the datasheet where the current sinks are chained:

Best regards,

@SBEN .2