TPS65400: TPS65400

Hi Michael!

Could please tell us the output current you need?

Shuai

both 1A

both 1A

Hi Michael!

You can set Vref as 0.85V and 0.9V by programming. By this way, you can connect Vout pin to Vfb pin directly. 

Besides the Vfb divider, there are other resistor and capacitor in the converter. Such as compensation parameters Rcomp and Ccomp, the output capacitor. 

These parameters are all determined by switching frequency, Input voltage.

Could you please clarify your requirements?

Shuai

the input is 12VDC. 

Can the Vfb set up individually for each output?  

Hi Michael!

Vref can be programmed individually, from 0.6V-1.87V.

Suggested parameters:

   L=0.68uH, Rcomp=10kohm, Ccomp=15nF, Cout=2*22uF(10V).

Shuai

do you have recommended 0.68uH inductor? 

There is a writing error. Not 0.68uH, 6.8uH.

You can search in www.we-online.com/.../start.php

It should be 6.8uH

do we need an additional 0.1uF for Cout? 

yes

can i use PGOOD from first TPS65400 to enable second TPS64400 CE

If you have a lot of other questions, you can summary these together. I will reply a summary answer.

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PG can be used to enable CE of second device. You need to pull up PG to VDD with a resistor.

based on Figure 8-13 from TPS65400 datasheet. there are Rc, Cc and Croll. so the Cc is 15nf? Rc is the 10K? what about the Croll?

what is the function of 0ohm on the TPS65400 EVAL board between CB and capacitors? 

does I2C programmer need I2CALERT signal? if not can i leave I2CALERT pin open?

Keep the position for that if customer want to slow down the turn on/off slew rate.

can this be 1/16W in 0402 package? 

the TPS65400 datasheet states that the external programmer needs to connect CE of TPS65400 (datasheet Page 24). the Evaluation board doesn't connect the CE over J13. can you please advise? 

It determined by the value of resistor.

can you please answer this question? 

the TPS65400 datasheet states that the external programmer needs to connect CE of TPS65400 (datasheet Page 24). the Evaluation board doesn't connect the CE over J13. can you please advise? 

does I2C programmer need I2CALERT signal? if not can i leave I2CALERT pin open?