Hi Team,
There is a good new that we DIN TPS54232
And there have one thing need your support!
Please help check this SCH, THX
Hi Ruby,
After discuss with customer , we have updated SCH & refer to attachment (L datasheet )!
And Io= 1.6AA
1.Please help check this SCH, THX
2.Cause this case need design power sequence , how could I design & calculate THX
Hi Kygo
Sorry for the delay. Here are my comments:
1. For the input cap, I would recommend to use 22uF + 0.1uF.
2. For the power sequence, would you please tell me the detailed requirement? Power sequence can be realized by PG pin and EN pin (use the PG signal of the master device to control the EN pin of the slaver device) or SS pin and EN pin. (EN sets the threshold voltage and SS sets the soft start time after EN enabling the device)
3. The inductor is a little bit large. Is there any special concern for the large inductor? I would recommend to choose KIND=0.35 as is expressed in the datasheet.
4. For the output cap, is TPS54232 supply for CPU? Does the load requires low ripple? I see the Cout is rather big.
5. If you change the inductor value, please also change the compensation value. You can refer to the webench to do the design.
If there is any question, please let me know.
Thanks.
Ruby
Hi Ruby
Thanks for your help! I will discuss with customer
Before that I'm calculating the startup time, can you help me confirm whether my calculation is correct?
TPS54232 after get Vcc5V will need 9.28mS (4mS+5.28mS) to give Vcc3V3
(4mS=C21*0.8/2u)
(T=R*C= R9*C18=5.28mS for EN pin)
Hi Kygo
Please refer to the picture below, just use resistive voltage divider for EN pin, and use the cap for SS pin. Because when you calculate the rise time for EN, it is not only the Vin to charge the cap, but also current source within the IC will also charge the IC. I am afraid that (T=R*C= R9*C18=5.28mS for EN pin) is not correct. See the highlighted block below. Thanks.
BR
Ruby
