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LP8867-Q1: Enable/Disable signal rail LEDs on the go

Bobby Chen
Prodigy 30 points
Part Number: LP8867-Q1
Other Parts Discussed in Thread: LP8863-Q1

Hi, 

My design goal with LP8867 is to be able to enable or disable individual LED rails on the go, with fault signal properly functioned. I have following design idea and would like some feedback:

- To disable a rail LEDn, disconnect the rail without tying OUTn to GND, and send a 10us reset signal to EN pin to clear the fault. 

- To enable a rail LEDn, connect the rail and send 500us reset signal to EN pin. 

- My questions is that not tying OUTn to GND is against the datasheet but I'm not sure if it creates a real problem in the long run.

Let me know if there is any concerns with this design or if you have better suggestions.

Thanks,

Borui

  • 0
    TI__Genius 15776 points

    Hi Borui,

    It's a good idea.

    First, I want to ask the application and the project you want to use LP8867.

    Second, if you use the device as you say,I think it can works.But when you disconnect the string the voltage of boost output will reach the max value you set.if switch is too frequent,I think it's harmful to device. 

    Third, if you want to control individual channel, i recommend you to use LP8863-Q1.