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Tool/software:
Hi,
Please help to review schematic, thanks
Vin 12V,
Vout1 1.8V 0.5A,
Vout2 1.1V 3A,
Vout3 3.3V 0.1A,
Vout4 disable
Hi Sir,
From the schematic, the resistor (R68=100kohm), it means that the target switching frequency in theory is 1.761MHz and the target switching cycle is around 568ns. If we take 1.1Vout rail as an example, the typical Vin=12V. Thus the HS on time need to support 52ns in theory. However, you can find from our EC table that tonmin max value is 150ns. It will be a limitation for the lower duty cycle. We would recommend you can re-design the switching frequency to achieve lower duty cycle (max Vin to lowest Vout). After re-design the switching frequency, you can double check your inductor, Cout and compensation components value.
Thank you.
BRs
Lucia