TPS65987D: TPS6598x OCC function in high current PDO start up

Gary Teng

Part Number: TPS65987D
Other Parts Discussed in Thread: TPS65987, TPS55288

Hi all,

My customer is testing TPS55288 and they hope its OCP delay function can help TPS65987/x to solve some short over current conditions from power sink (like NB) when high current PDO (like 20V3A) is negotiated. Generally we can set high peak current % in reg 0x32 to solve the issue but it's not the spec. we hope in normal PDO condition (the current limit spec. is too high in normal ). Can we set OCC (in register 0x27) to solve the problem?

Or we can use TPS55288's OCP delay funcaiton and disable TPS65987's OCP protection in some special condition?

Best regards,

Gary Teng

over 5 years ago

0 Prajith Cheerakkoda over 5 years ago

TI__Expert 8680 points

Hello Gary,

"Generally we can set high peak current % in reg 0x32 to solve the issue but it's not the spec"

>>> Sorry, I did not get your point. Do you mean peak current is not allowed per spec? If yes, peak current is allowed as per spec.

Thanks
Prajith

0 Gary Teng over 5 years ago in reply to Prajith Cheerakkoda

Genius 5840 points

Hi Prajith,

I means customer might need .... maybe 3.5A as its normal OCP point and its peak current setting is 130%. But due to inrush current issue at the beginning of high power PDO start, we have to set peak current setting to 150% or higher to solve the issue currently.

Best regards,

Gary

0 Prajith Cheerakkoda over 5 years ago in reply to Gary Teng

TI__Expert 8680 points

Hi Gary,

I would suggest you to try lower Soft Start Timeout in 0x28. OCC is applicable only for 5V contract, >5V its OCP.

What happens if you fully depend on TPS55288 current limit with a UVP (Vbus may go down in current limit mode)?.

Thanks

Prajith

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TPS65987D: TPS6598x OCC function in high current PDO start up