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We are running into an issue in our board where we are using LP87334D as PMIC and TPS563210 as pre regulator.
TPS563210 is giving high voltage and high ripple at no load. As per our design we know that it will go to Eco-Mode below 0.25A load but even in that case converter should give regulated output with reduced switching frequency. But as per the web bench simulations it is showing that frequency can be somewhere in 2KHz range for 1mA of load but surprisingly what we are getting is 21Hz and as ripple is very high voltage is going above 6V and this stops LP87334D to power up. Please see the waveform attached as well as schematic.
Can you please help us in this issue during no load. I feel there is no requirement of minimum load for this converter.
Hi Ranjith,
Thanks for reaching out! Could you please help capture waveforms of SW and IL ?
And Could you please tell me why C162 is added?
BRs
Zixu
Hi Ranjith,
Could you please also share your layout as well?
And could you please help measure the magnitude of output voltage ripple as well as DC value of output voltage? Since it is not quite clear to see magnitude of output voltage ripple from uploaded figure.
BRs
Zixu