Can we replace the output filter capacitor 330uf to 220uf and 22uf to 10uf.
Secondly it is necessary to use 1uf and 100nf both the bus pins.
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Can we replace the output filter capacitor 330uf to 220uf and 22uf to 10uf.
Secondly it is necessary to use 1uf and 100nf both the bus pins.
Hi,
We do not need 330uF on output, and 22uF is not necessary but need to meet total caps value for output.
Regards,
Ansel
1.what will be total output caps value for output filter.
2.it is necessary to use 1uf and 100nf both the BUS pins
3. as we need min 6v divider ckt for enable pin so please provide the calculation or resistor value for min 6v.
4. the two AL-cap we are using in the ckt one in input another one in output value what about the ESR value of them ?
5.Please suggest NTC part
6.while converting to the port c to port A what will be value of the resistor for pull -up and with which power supply we are giving pull up
7. output switching capacitor DCR Value range.
Hi,
Please refer 858 EVM for your reference.
https://www.ti.com/tool/TPS25858Q1EVM-140?keyMatch=&tisearch=search-everything&usecase=partmatches
Regards,
Ansel
Hi,
Please find the below comments.
1.what will be total output caps value for output filter.
[Refer to EVM]
2.it is necessary to use 1uf and 100nf both the BUS pins
[It might be helpful for MEI, you can reserved both]
3. as we need min 6v divider ckt for enable pin so please provide the calculation or resistor value for min 6v.
[Refer to datasheet-10.3.1]
4. the two AL-cap we are using in the ckt one in input another one in output value what about the ESR value of them ?
5.Please suggest NTC part
[Refer to EVM]
6.while converting to the port c to port A what will be value of the resistor for pull -up and with which power supply we are giving pull up
[CCx pull-down with 5.1k]
7. output switching capacitor DCR Value range.
[Refer to EVM]
Ansel
In EVM total value of output capacitor is 396uF so can i use 10uF in place of 22uf so total value be 270uF AND 3 Capacitor of 10uF so it will be 300uF. is it Ok.
in the above reply what MEI ?
For output inductor DCR we are using 4.7uH.DCR 7Mohm.
Regards,
ATUL KUMAR SINGH
Hi,
Sorry for mistake, it is EMI. In EVM, the total caps are 3x22uF. (https://www.ti.com/lit/ug/slvuc19/slvuc19.pdf?ts=1624630143868&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FTPS25858-Q1)
Regards,
Ansel
Hi,
I Saw EVM ckt but my question is 300uf at output filter is enough or not.
and secondly about the DCR value of the output inductor.
Basically what is used in the EVM i aware of it bnut my question is what we are using is it enough for your solution.
Hi,
It does not need 300uF, 3x22uF is fine or a little bigger. DCR is related to efficiency, it is not related for TPS25858 design.
Ansel
My question is 270uf i am using in place of 330uf so it is ok or you want me to not to use any 330uf or either 270uf.
and in place of 22uf*3 i want to use 10uf*3 is it feasible. so my total value will be 270uf+10uf*3= 300uf.
can you tell me clearly what are the value required for the output filter as per EVM we need 330uf+3*22uF= 396uf.
so please clearly tell me about this.
I know but as per our prev experience in thermal we are getting device reseted with more DCR value of the inductor so what will be enough
Hi,
Why is need 330uF??? Please follow EVM design, ok? For output caps only have 2x33uF on output.
Ansel