TPS2117: "IMAX,PLS" of Absolute Maximum Ratings

Hi Dice,

It can support 6.4A for 1ms considering there is no current for 98% of pulse duration.

Regards 

Kunal Goel

Hi Kunal,
Thank you for your reply.

I am looking for the cause of the TPS2117 failure.
I have sent the waveform in a private message, so could you please take a look?

Best regards,
Dice-K

Hi Kunal,

Have you seen the private message?
Can you give us your opinion?

Best regards,
Dice-K

Hi Dice-K,

I have replied there.

Hi Kunal,
Thank you for your reply.

I still can't decide if there are any problems with this usage.
I think that CH4 is the current that is charging the two 47uF output capacitors via the TPS2117, but is this incorrect?

Best regards,
Dice-K

Hi Dice,

Is it possible to reduce that current? I dont see major risk. But can  try to reduce that current.

Hi Kunal,
Thank you for your support.

When switching VOUT from VIN1 to VIN2, this current flows.
Is there a way to prevent this?
Is this current normal and does it not lead to a breakdown?

Best regards,
Dice-K

Hi Dice,

Is it possible to probe input current and both input voltages in same experiment?

Regards

Kunal Goel

Hi Kunal,
Thank you for your support.

I have measured the input voltage and input current of VIN1.

I have sent the waveforms in a private message.

Do I also need to measure the VIN2 side at the same time and get the waveforms when switching from VIN1 to VIN2?

Best regards,
Dice-K

Hi Kunal,

When I first enquired, I told you that the current generated by switching the TPS2117 was large.
However, on investigation, I found that switching the power supply of the TPS2117 caused the switching waveform of the TPS61020 in the downstream stage to become abnormal, causing the current to increase.
Because this increased current flows via the TPS2117, I sent you the waveform on June 27th.

For that reason, I would like to know whether the current and voltage flowing through the TPS2117, rather than the input current and voltage when the TPS2117 is switching, is this the cause of the failure?
Would it be possible to make a judgment from the waveform from June 27th?
Please contact me if you do not have enough measured waveforms, etc.

Best regards,
Dice-K

Hi Dice,

Is it possible to isolate load from tps2116 ? This will tell if load is drawing pulse current?

Regards 

Kunal Goel

Hi Kunal,
Thank you for your support.

I think the strange pulses will probably stop if I remove the load.

The waveform sent in the private message shows that the TPS2117 input current is 800mA at 20msec and the output current is 6A at 80usec.
This does not exceed 6.4A with a 1msec pulse as stated in the data sheet, so I think it's fine. What do you think?

Best regards,
Dice-K