Hi,
We are using a MP3398A to drive a 2 strings backlight. For some reason, with PWM higher than 20%, the VOUT is rising up to OVP and the IC shutdown after a few ms. He can see the LED turn on and then off quickly.
At the moment where the VOUT rise, The LED voltage starts to rise.
All signal point behavior are perfectly normal.
Changing the frequency seem to change the behavior.
Any idea?
CH1 (Yellow) = MOSFET GATE
CH2 (Blue) = Dimming PWM
CH3 (Purple) = Vout
CH4 (Green) = VLED1