Other Parts Discussed in Thread: AM3352
My customer have some issues when using TPS65217 to power for AM3352. there is a strange sign that Vsys drop down abnormally when power on vac.
Below capture is shown below;
Ch1 is SYS waveform powered by 5Vdc. Drop down to 1V in 80ms.
Ch2 is LDO2 output.
Ch3 is LDO1 output.
1. Checking from the circuit schematic diagram, what would cause VSYS power on abnormally?
2.According to our datasheet block diagram, I see customer connect VINLDO directly to VSYS. Why LDO1/2 react different voltage waveforms in below capture?
3. If VINLDO has input voltage(ignore actual connect to SYS), would LDO1/2 has regular output?