Hi guys,
My customer has the following question:
I have a question about open channels on the LP8556 backlight driver. We are currently using the –E11 version (see page 3)
which enables 3 channels but has a max boost output voltage set to 21V. We use the preconfigured version as-is and do not have a software
driver enabled to be able to change the register settings.
We need to raise the max boost voltage and I tried the -E02 version on a board – it worked and solved the issue I was having. But this configuration
enables all 6 channels on the device. We only use three, our backlight is 7S3P – three strings of 7 LEDs in series – so we only have three channels
hooked up, the other three are open.
The part is obviously able to figure this out and still function properly since it is working on the board I modified, but are there any reliability or other
issues that I have to worry about if we switched to using the -E02 version in this configuration? Does having three enabled open channels have any
negative consequences?
Thanks,
Brian