TPS53515: Minium Low-Side On Resistance Value

NAIM OTHMAN

Intellectual 270 points

Part Number: TPS53515

Hi TI team,

It is mentioned in the datasheet low side Rds-on is 5.9mohm(typ), and 8mohm(max). May I know the minium value?

Regards

over 3 years ago

0 Young Zhao over 3 years ago

TI__Genius 9280 points

May I know why you need this value ?

and please share me your mail address to young-zhao@ti.com, for the production distribution for your reference .

best regards,

Young

0 NAIM OTHMAN over 3 years ago in reply to Young Zhao

Intellectual 270 points

Hi,

We are using TPS53515 with the following condition

Iocp(typ) = 7.4 A ( Rds = 8 mohm)

Iocp(max) = 10.5 A ( Rds = 5.9 ohm)

Our application is approximately 5A ~ 6A. We want to make sure it below Iocp(min).

Regards.

0 NAIM OTHMAN over 3 years ago in reply to NAIM OTHMAN

Intellectual 270 points

Hi Zhao,

Ok I misunderstood the condition.

The above Iocp with Rds = 8mohm is the minimum Iocp.

Thanx for clarification.

0 NAIM OTHMAN over 3 years ago in reply to Young Zhao

Intellectual 270 points

Hi Young I have another question,

How can I relate the Iocl below with ocp?

The current limit threshold seems to differ about 15 ~ 20%. If I want to calculate the worst ocp with Rds = 8mΩ, do I still need to reduce it 20 % further to get the correct worst value?

Regards

0 Young Zhao over 3 years ago in reply to NAIM OTHMAN

TI__Genius 9280 points

Hi ,

TRIP pin is the OCL detection threshold setting pin thanks to the internal 10uA current source to set the OCL trip voltage.

The IOCL value is shown as the spec data with specific value resistor. The variation mostly comes from the different Iripple in Equation 5.

No need to reduce 20% if the application is set(VIN,VOUT,IOUT,L..).

BRs,

Young

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TPS53515: Minium Low-Side On Resistance Value