TPS56221: TPS56221 enable

Sammi Shang

Part Number: TPS56221

Dear team,

Customer find that when use TPS56221, they pull down EN to GND first, then float, the IC did not work. Vin is on all the time, and also add a ss capacitor 33nF beside EN.

Thanks.

Best regards,

Sammi

over 4 years ago

0 David_Daniels over 4 years ago

TI__Mastermind 19030 points

Sammi,

What is the voltage on the EN pin when en pin floating? If the enable pin is floating and then input voltage applied, does the device start up and regulate?

Can you share a schematic and the oscope plot of VIN, EN, BP5 and Vout when floating enable after input voltage is present.

Power management

Power management forum

TPS56221: TPS56221 enable