TPSM82913: schematic review, especially input & output capacitors

Noriyuki Takahashi

Part Number: TPSM82913

Hi team,

Could you review two schematic as below? Especially, could you review the input and output capacitors? There are concerns that capacitor value cosiderign DC-bias can't meet device recommendation.

Designator	Quantity	Value	PartNumber	Manufacturer
C15, C39	6	10 uF	08053D106KAT4A	KYOCERA AVX
C16, C40	2	2200 pF	04023C222JAT2A	KYOCERA AVX
C17, C18, C19, C41, C42, C43	16	22 uF	C2012X7S1A226M125AC	TDK Corporation

Regards,

Noriyuki Takahashi

over 1 year ago

0 Yuchang Zhang over 1 year ago

TI__Mastermind 18510 points

will review and give feedback tomorrow.

Yuchang

0 Yuchang Zhang over 1 year ago in reply to Yuchang Zhang

TI__Mastermind 18510 points

Noriyuki -san,

1, Recommend to reserve one more 10uf cap at input side.

2, Recommend Feedback loop back after output caps of second stage (at least 3x22uf cap), for current design, which should be after feedthrough capacitor.

3, remind Ferrite bead following the spec or P/N recommended in datasheet.

Yuchang

0 Noriyuki Takahashi over 1 year ago in reply to Yuchang Zhang

TI__Genius 10950 points

Yuchang,

Yuchang Zhang said:
2, Recommend Feedback loop back after output caps of second stage (at least 3x22uf cap), for current design, which should be after feedthrough capacitor.

Sorry, but I am not sure what this mean. What should they chagne from their schematic?

Regards,

Noriyuki Takahashi

0 Shuai Fan over 1 year ago in reply to Noriyuki Takahashi

TI__Genius 13451 points

Hi Noriyuki

Yuchang is in holiday,will give you feedback next week

Shuai

+1 Yuchang Zhang over 1 year ago

TI__Mastermind 18510 points

Noriyuki -san,

For customer's application, 3x22uf output capacitors is recommended for second L-C stage.

Due to customer using feedthrough capacitor for second L-C stage, my recommendation is to put feedback line back from C46 for U11.

For U7, also recommend to add 2*22uf before feedback line of second L-C stage. customer could put C21/C24 before feedthrough cap(FC1 FC2) instead of adding more caps as well.

Yuchang

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TPSM82913: schematic review, especially input & output capacitors