4.1.3 MODE and EN Pins

The TPS62260 features a power-save mode to improve efficiency at low output powers, but it is not needed in this application. By connecting the U2 MODE pin to VIN, this feature is disabled, and the device operates permanently in PWM mode.

All three LED driver circuits are connected to a common enable signal (NET_EN) that allows the MSP430 MCU to completely enable and disable the power stages if necessary. A pulldown resistor is used for the TPS62260 enable signal. This pulldown resistor causes all LEDs to switch off after the supply voltage is applied to the EVM. The MSP430 MCU activates the LEDs and avoid flashing LEDs during startup.