TPS22990: TPS22990

Gary Chien46

Prodigy 20 points

Part Number: TPS22990

Hi Guys,

I got some problems when my system is power down.

When VIN (+5V_SBY) is around 1.6V, discharged slowly as figure, there is a spike on Vout around at 1.26V.

At this time, Von is around 0.74V. Please advise what is happening and how can I avoid this symptom.

ThanksTPS22990_5VS_SPIKE.pdf

over 5 years ago

0 Rakesh over 5 years ago

TI__Guru** 107121 points

Hi Gary,

We will get back to you early next week.

BR, Rakesh

0 Timothy Logan over 5 years ago

TI__Mastermind 36315 points

Gary,

Could you try to increase the output capacitance of the design to something like 100uF for testing here? What might be happening here is that the input is turning off suddenly and there is a reverse current condition. We generally recommend a 10:1 input-to-output capacitance ratio to prevent against conditions like this.

Power management

Power management forum

TPS22990: TPS22990