Hi everyone, I'm coming back for advice,

I think I improved a bit since I last came here, I normally have everything wired right, but the only "problem I have is choosing the right capacitor for the HT350-1 circuit I'm just not sure tantrum is the way to go, advice on alternatives ? the datasheet of the H7350 advice to use polarized Capacitor but these tantrum are big !

anyway thanks guys !

 

Hi everyone, I'm coming back for advice,

I think I improved a bit since I last came here, I normally have everything wired right, but the only "problem I have is choosing the right capacitor for the HT350-1 circuit I'm just not sure tantrum is the way to go, advice on alternatives ? the datasheet of the H7350 advice to use polarized Capacitor but these tantrum are big !

anyway thanks guys !

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The data sheet does not seem to talk about the type of output capacitor (the 10uf) or what the ESR range should be. Other LDO regulator chips do talk about this because they use a PNP-like pass transistor which is a design made for LDO applications but subject to possible oscillations with the wrong output capacitor value and/or ESR range.

Perhaps you can consult another LDO part number and read about this on their data sheet if you can not find a better data sheet or application notes. Alternately if you can change the part itself to a different part number, you can look at the data sheet for that and use that as a guide.

The typical cap used there is an electrolytic with a certain ESR range.

 

I will just suggest some improvements in schema, you can divide the circuit in different section as per operations. See I also made the schema in Easyeda For my class D amplifier. I used different sections here. And here you are using C3 esp which may have a onboard antenna, remove the ground plane from PCB where antenna is placed.

 

Your board shows two components U3 and U5 which are not shown in the schematic.
What voltage and case size did you choose for the tantalum? A 10v, 10uf tantalum should be available in a case A.
You know that Easy Eda allows you to select the case size?

 

U3 and U5 are the small bypass capacitors for the three terminal regulator. They should both be mounted CLOSE to the regulator terminals. The filter capacitors can be farther away from the regulator. So I would exchange the positions of C2 and U5 on the schematic, and then put both U3 and U5 much closer to U2 on the PCB layout. That will provide the benefit, also, of moving the polarized capacitors farther from the heat generated by U2, a series LINEAR voltage regulator.