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TPS55340: TPS55340 not stable Output ripple at 400mA current

Part Number: TPS55340

Hi all,

Customer found TPS55340 not stable when output current is more than 400mA.

Input voltage is 3.7V, output voltage is 19V. Any suggestion of improving heavy load response? Thanks.

Figure 1 shematic

FIgure 2 output current 

Figure 3 output current cycle