LM3697: Can LM3697 support 2s10p 26mA screen

Hi Jaden,

LM3697 can support up to 40V and 30mA per LED string.

BR

Patrick

Hi Patrick,

I noticed the datasheet mentioned the maximum regulation current is around 22mA, rather 30mA. Is it because the test condition is 20mA full scale?

Best Regards,

Jaden Yue

Hi Jaden,

Yes, your understanding is correct. This spec is used to describe the current accuracy, so its range is related to the programmed full-scale current.

BR

Patrick

Hi Patrick,

Can you help clarify is there any function difference/impact if we set the Auto-Headroom enable vs Auto-Headroom disable? I checked the different value of 0x02 and 0x12, the LEDK voltage will be different.

Best Regards,

Jaden Yue

Hi Jaden,

The headroom voltage is to ensure the current sink could be capable of expect current.

So if you disable the auto-headroom, the IC will force the headroom voltage to a larger value to make sure the current could be regulated accurately.

If you enable this function, then IC will determine the headroom voltage according to the LED current, thus will reduce the power loss on current sink itself.

BR

Patrick