I have a project that has as 3W (using 500mA) Led and an I2C sensor at the end of a cable, and I need 6 wires for it. (4 to the I2C sensor) and 2 for the led.
I’m using the PT4115 CC led driver CI, but LED- is not GND, so I need two wires from the driver to the led at the end of the cable.
But I want to use a 5 wire cable, to use standard micro USB 5 pin connectors to connect this cable to the control box.
I’m searching for another led driver PWM capable IC that has a common GND at the led cathode, so I can share the same GND pin I use for I2c, but so far no luck...
Does anyone know of any SOP pwm capable led driver ic for a 3W led that has a commom gnd?
Or a way to get around this, in a power efficient way?
My Vin for the led driver is a 7.4V battery, and an attiny85 at 5V controls it’s pwm and the i2c sensor (proximity sensor).
I actually did find and tested a CN5711 IC (but in a separate module, not in my circuit) that has a common GND, but it heats a lot at 500-600mA...
The PT4115 with the proper inductor stays cool with no need for heatsinks... my enclosure space is limited in hight, so a heatsink is a problem if needed...