It’s sold in up to 3s configurations. I’d assume that 12.6v is the highest sanctioned input voltage. I haven’t made a list of QX9920 based drivers, but this is what I came up with just now:
- HX-1175b - spec’ed a few different ways, but the highest input voltage spec I’ve seen is 15v. Other listings say 8.4v.
- 16MM 8.4V 5-Mode 3A LED circuit board For 2*Cree XM-L at Lightmalls - No real spec. They might be trying to say up to 8.4v.
- Solarforce XM-L2 dropin driver at Solarforce-Sales - Spec’ed at up to 9v. My (brief) earlier look into this indicated that they skipped the (semi) “regulated” PSU section for the QX9920, so this driver is probably limited by that more than anything else.
- Patrol King - no spec, but it’s physically setup for 2s, so take that FWIW.