TPS25833-Q1: Current is also change with Rimon Value

Mehmet COBAN

Part Number: TPS25833-Q1

Hello,

I am using TPS25833-Q1.

I design a basic Dual port Type-C charger. I set the Rlim value to 26.1k ohm to set the current 1.5A. And I also set the Rimon value to 4.7k ohm to make cable compansation. ( I set Rwire is equal to 100mohm. I did not use Mosfet).

An interesting thing is " Although Rlim value is stable, current is also change with Rimon value." Here is the datas that I measured:

RIMON:		4.64K ohm	4.7K ohm	12.1k ohm
RLIM:		26.1k	26.1k	26.1k

Maximum Current to make Voltage Stable on 150m ohm Cable Resistance		1.516A	1.465A	1.485A

Stable Voltage with 150m ohm Cable Resistance

4.96V

4.9897V

5.27V

Is it make sense?

Please find the schematic in the attachement. Actually, it is not my schematic but I copied every edge of it. Only differances are Rimon and Rlim values.

Regards,

Mehmet.6305.TIDM117 (7).PDF

over 2 years ago

0 Kuno Wu over 2 years ago

TI__Mastermind 18556 points

Hi Mehmet,

I have receive your question, and I will try to do some test using our EVM, and will reply to you soon.

Thanks,

Kuno.

0 Kuno Wu over 2 years ago in reply to Kuno Wu

TI__Mastermind 18556 points

Hi Mehmet,

I have tried to do some test using our EVM, and my user Rlim is 26.1Kohm,and Rimon are 4.64Kohm,4.75Kohm,12.1Kohm,in these setup condition, all current limit value is 1.56A,and the VBUS waveform is below, and the VBUS value is 5.08V,5.13V,5.38V.All test result is normal.

So, can you help me the measure VBUS waveform when the device is in the current limit condition? I need to make a confirm whether the device is in the current limit condition.

Thanks,

Kuno.

0 Mehmet COBAN over 2 years ago in reply to Kuno Wu

Intellectual 275 points

Hi Kuno,

Thank you so much for your support.

I will do your request.

Thanks again,

Mehmet.

0 Kuno Wu over 2 years ago in reply to Mehmet COBAN

TI__Mastermind 18556 points

Hi Mehmet,

Looking forward to your test result.

Thanks,

Kuno.

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TPS25833-Q1: Current is also change with Rimon Value