Hi team,
I'd like to set the output current to 0mA.
the bellow conditions, about several mA is output.
UDIM : 3V(High)
IADJ : 0V(Low)
I assume this is because of switching if Vin is present, but is there any way to set it to 0mA?
BR,
Kengo.
Hi Kengo,
The TPS92641 device is designed to provide precision dimming control for LED drivers, and it does have the capability to achieve true-zero LED current operation. This is achieved through the use of the IADJ terminal, which is the input of analog dimming control voltage.
When the voltage at the IADJ terminal is set to 0V, the device should theoretically operate at true zero average current level. However, even in this condition, there will be a certain amount of LED current passing through the LEDs, even though the average inductor current is well-regulated at the 0-A set-point. (TPS9264x Synchronous Buck Controllers for Precision Dimming LED Drivers datasheet - Page 13)
Also, true zero LED current dimming can be achieved by installing R11 in place to offset the zero LED current point. (User's Guide for the TPS92641EVM - Page 5)
Therefore, to achieve 0mA output current, you should ensure that the IADJ terminal is set to 0V and that R11 is installed. However, please note that due to the
nature of the device, there may still be a small amount of current passing through the LEDs.
