TPS54218
For my DC/DC converter to generete 3.3V from 5V, I applied TPS54218 referenced the schematic shown in the User's Guide (SLVU331, Figure 16) with the following modification.
My circuit shows starlike output voltage, rampup to around 2.5V and stay there for about tens of mili-seconds (sometimes a couple of minutes), then go up to 3.3V.
Are there anyone who have the same phenomenon as above? Could someone tell me why this happens?
<Modified devices from the original circuit stated in Fig.16.>
R3:11.5kohm
C1:10uF
C4:5600pF
C5:68pF
R7: 10kohm
R8+R6:31.1kohm,
C8,C9: 47uF each
C7: 0.015uF
EN: at Vin > 4.1V
