TPS25740A design issue

Kuo Nowal

Expert 2315 points

Other Parts Discussed in Thread: PMP11451, PMP11455, TPS25740A

Hi Sir,

Currently we design Type-C PD Adapter and reference PMP11451,

Modify PMP11455 5V, 9V, 15V use TPS25740A, but test only 5V, 8.8V no output 15V,

CLT1 5.9K >> 9.7K

CLT2 6.65K >>7.5K

over 8 years ago

0 Eric Wright over 8 years ago

TI__Mastermind 42795 points

On the AC-DC converter, what is the value for R10?

TPS25740A can support 5V, 9V, and 15V but not 12V. If the AC/DC outputs 12V upon request, the TPS25740A will see that as UV (for 15V request) or OV for 9V request. It might be easier to set R10 to zero ohm and then size R5/R6 to get 9V (CTL2 low) and 15V (both CTL1 and CTL2 low).

0 Kuo Nowal over 8 years ago in reply to Eric Wright

Expert 2315 points

Hi Sir,

Sorry, correct 5V, 9V, 15V, and R10 is 10 ohm.

0 Kuo Nowal over 8 years ago in reply to Eric Wright

Expert 2315 points

Hi Sir,

Can provide R5, R6, R10 value if we design 5V, 9V, 15V, thanks.

0 Eric Wright over 8 years ago in reply to Kuo Nowal

TI__Mastermind 42795 points

Hi Kuo,

It is OK for R10 = 10 ohms. Please set R6 = 12.4k and R5 = 8.25k. By the way, did you see the design spreadsheet tool on the web (http://www.ti.com/lit/zip/slvc659)? It can help you calculate these values and I've shown an example below:

0 Kuo Nowal over 8 years ago in reply to Eric Wright

Expert 2315 points

Hi Sir,

Got it, thanks for your support.

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TPS25740A design issue