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TPS54227:Vout increase when EN:Low

Guru 19575 points
Other Parts Discussed in Thread: TPS54227

When TPS54227 supplying Vin:12V and keep EN:Low, Vout is increased (rised).

(Please see below)

※Yerrow: Vin_12V / Blue :EN Low / Pink: Vout_0V~3.3V / Green : Another 1.15V line(unrelated)

If there find the reason of Vout increase(EN:Low), please let me know.

【Additional information】

・12Vin ⇒ 3.3Vout

・0.9A

・Cin: 22μF POSCAP

・Cout: 44μF ceramic (22μF×2)

・Inductor: 3.3μH (SPM6530T-3R3M)

・3.3Vout line is not connect other DC/DC and LDO.

Best regards,

Satoshi