Hi All,
I have an application that has 3 chains of LEDs. Only one chain will ever be on at once, so I was thinking of using external N channel MOSFETs, e.g. BSS138 (common source to the Rs resistor) to select which chain is selected, and use the enable pin to turn the driver on and off. I don't need PWM control.
I notice that the TPS61042 has it's own LED FET. From the block diagram the Vfb signal is directly available on an external pin. Can I bypass the internal FET (Q2 in the TPS61042 block diagram) and connect the LEDs to my FETs' drains and then connect the sources of my FETs to the FB pin?
Thanks!
Mark.