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TPS54332: ECO模式下,后接LDO(BD3570),纹波过大接近300mv,导致MLCC电容啸叫

Part Number: TPS54332

↑  当前原理图

↑ 当前Layout

↑ 有参照WEBENCH® POWER DESIGNER  值修改过,未有改善

↑ 未接负载 

↑ 接上LDO(BD3570)低负载,未测负载电流 

↑ LDO 另接150mA负载后