TPS65053 getting hot

I split this thread as this is a new question.

Can you post a schematic?  What are your circuit connections--where is Vin connected, where are you measuring Vout, is there a load?

Chris Glaser said:

I split this thread as this is a new question.

Ok Thank you.

Here is the schematic.

Chris Glaser said:

What are your circuit connections--where is Vin connected, where are you measuring Vout, is there a load?

i tested the circuit with no load charge in first, i mesured the output of DCDC1 converter

Vin is connected to 4.73 V

Thank you.

I'm sorry but the schematic did not attach properly.  Please retry.

i have do the same schematic like this :

0160.i-IPNC_MB_A104_20081104.pdf

Thank you.

What is your Vin?  What is the circuit doing wrong?  How much input current is it drawing?

Can you verify that the voltage on EN_33VD is stable and not changing?

Chris Glaser said:

What is your Vin?  What is the circuit doing wrong?  How much input current is it drawing?

The vin is 4.73 V , the circuit hot a lot , the circuit need  150 mA

Chris Glaser said:

Can you verify that the voltage on EN_33VD is stable and not changing?

yes EN_33VD is stableat the 4.69 V.

Let's try isolating the different parts of the IC.  First, Ohm out the input connection (PWR_VIN).  It should be high impedance.

Then, apply Vin and pull all the EN pins low and see what the input current is.  Then, try EN'ing each output, one at a time, and see when the input current kicks back up.

Chris Glaser said:

Let's try isolating the different parts of the IC.  First, Ohm out the input connection (PWR_VIN).  It should be high impedance.

Yes i have a high impedance

Chris Glaser said:

Then, apply Vin and pull all the EN pins low and see what the input current is.

the input current  is very low ~0 .

Chris Glaser said:

Then, try EN'ing each output, one at a time, and see when the input current kicks back up

I enabled only the first converter and the compenent hot a lot and i have 3.3 v in the output , the current in input is 300 mA.

I enabled only the second converter and it works well ; so i beleive that i have problem in the circuit of the first converter. but i don't know where is the problem ???!!!!

So, we have found that the problem is isolated to the first converter.  Could you send a scope capture of VINDCDC1/2, L1, and the 3.3V output, after power is applied?

Do you have anything at all attached to that output?

Hello ,

Now , i have an other problem , when i put a load charge of 10 ohm  at the output of 3.3 v , the voltage shutdown to 1.06 v.

Any idea ?

Thank you .

I am glad you were able to get it working with the new inductor.

It would be very good to run a bode plot on that rail in forced PWM mode at around 100 Ohm load.  Since you are using different component values than the datasheet recommends--4.4uH inductor, 22uF cap, and 33 pF cap--stability is a concern.

For this latest issue, first check your input current limit on your input supply.  Then, a scope capture of Vin, SW node, and Vout would be the next thing to loook at.