Need TI's help to review TI regulator switching power design!

Hello Huy,

Thanks for reaching out!   This particular forum is dedicated to questions about our integrated load switches, I will move your post to the DC/DC forum so the correct people can see and respond to your post. 

From the load switch perspective, I see you are generating 1.8V and 2.5V twice.  You might be able to reduce cost and size if you use a single DC/DC converter to generate each voltage, and then use a load switch downstream to turn the multiple rails on or off as required by the system. 

TPS22912C can deliver up to 2A

TPS22963C can deliver up to 3A

Best Regards,

Adam Hoover

Load Switch Applications

Do you have a local FAE that you work with?  They can help you with a schematic review.

If not, this is the proper place for one.  I would suggest renaming your post title with the part numbers in question.  Some are LDOs, which are supported in the linear regulator forum.

The TPS62140 and 3x TPS62160s look good.  But what are you trying to accomplish with the diode from PG to EN?  

As well, how is the FSW pin connected on the TPS62140?

I can look at you TPS54521 schematic.  If you supply the schematic only, I will look for obvious errors and unusually large or small component values.  If you want me to check the component values, you will need to supply the design criteria and any equations used to determine the component values.  Let me know how you want to proceed.

Hi Chris,

I don't have local FAE. So, I would like to need your help.

Yes, in the design there are TPS74801 is LDO. I will move this schematic to linear regulator forum.

About your question on diode from PG to EN, I need the PG signal is LOW when Enable is Low.

About TPS62140, I have option to pull low or high this pin. You can see the FSW_1V2_FPGA signal is pull low to GND through resistor R10 (220Ohm) by default for the switching frequency = 2.5 MHz.

By they way, can you please help any body can review the TPS54320, TPS53316 and TPS53310 which is really new for me .

Thank you very much.

Best Regards,

Huy

Hi John,

I would like to need your help review the component value, especially the compensation circuit. Can you please let me know what the equation do you need?

By the way, can you please forward this schematic to some body that can help me review the TPS54320, TPS53316 and TPS53310 which is really new for me.

Thank you very much,

Best Regards,

Huy

The TPS62140A device holds PG low when EN is low.  Otherwise, the diode and those RCs would work.  The TPS62150A 1A device also does this, in case you wanted to change the TPS62160 to that one.

You need to connect FSW to Vout or PG at startup, per the D/S.  Just make sure this is accomplished in your system.

Whatever design equations were used, just forward them to me.  It is the only way I can verify them.   TPS54320, TPS53316 and TPS53310 belong to the HPS group.  Lets see if someone responds.  If not I will try to forward this post to someone who can help.

Hi John,

Please help someone can help review the TPS54320, TPS53316 and TPS53310.

Thank you very much in advance.

Best Regards,

Huy

Hi John,

Have you forward my schematic section  TPS54320, TPS53316 and TPS53310 to anyone in HPS group yet? Please help me soon. The project is urgent.

Thank you and Best Regards,

Huy

I have forwarded this post.

Also I looked at the TPS54521 schematic.  Without design equations, I cannot verify all the component values, but I can make some general comments.

You have a feed forward cap C59.  It is probably not useful for electrolytic output capacitors and 1.5 V output.  You can leave a placeholder for it if you want.  The inductor current rating may be on the low side.  We generally recommend the inductor to be rated for the current limit of the IC.  The TPS54521 does have hiccup current limit though, so there is some inherent protection.  in the compensation, C64 looks a little low and C63 looks a little high.  I would have to see the calculations to verify it though.

Thank you very for your feedback John,

Could you please send me the result soon on TPS54320, TPS53316 and TPS53310 when you have review feedback from your friends?

Best Regards,

Huy

They should respond via this forum.