I am trying to operate the LP8864EVM module in standalone evaluation mode, but I am running into some issues. My goal is to light up the LEDs using an external voltage source and PWM signal. The changes made to the circuit were: placing R20 - 10kohm, removing R19.
I applied 12Vdc for Vdd and 3.3Vpp/400Hz pwm signal but the LEDs are not lighting up. Vboost is stable at 43V when the pwm signal is disconnected but starts to decay when the pwm signal is connected.
The module worked with the software.
Are there any steps I am missing or doing incorrectly?
