TPS25990: Configuring the limitations by HW (resistors) - V_ref and V_lim

Eyal Bar

Part Number: TPS25990
Other Parts Discussed in Thread: TPS25985,

Hi,

I'm using a dual eFuse topology (TPS25990 in parallel to TPS25985) - I used TI's calculator for the required resistors and capacitor configuration.

When I checked the EVM for reference I saw that the resistors are not populated at all - and when I tested my design I saw that the configuration was set by the internal register and not by my external resistor (as default).

Can this default be altered for HW configuration instead of SW configuration?

Also, in parallel connection, at start up, how do I know what is the inrush limit? the current sharing threshold is valid during start up?

Thanks for your help!

Best Regards,

Eyal Bar

over 1 year ago

0 Avishek Pal over 1 year ago

TI__Mastermind 38910 points

Hi Eyal,

While you are using single TPS25990 eFuse or TPS25990 + TPS25985 eFuses in parallel, VIREF can only be set through PMBus, not HW configuration.

Please refer to the "Selecting the RILIM resistor to set the current limit and fast-trip thresholds during start-up and the active sharing threshold during steady-state" section in TPS25990 2.9 V – 16 V, 0.79-mΩ, 60-A Stackable eFuse with PMBus Digital Telemetry datasheet (Rev. B) (ti.com). If you still have queries, please let me know.

0 Eyal Bar over 1 year ago in reply to Avishek Pal

Prodigy 20 points

Hi,

Thanks for the answer.

I just want to be sure:

I cannot use any HW configuration on I_Ref pin for the TPS25990? it's only for measuring the V_ref which we set through the PMBus.

Best Regards,

Eyal Bar

0 Avishek Pal over 1 year ago in reply to Eyal Bar

TI__Mastermind 38910 points

Hi Eyal,

You are correct.

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TPS25990: Configuring the limitations by HW (resistors) - V_ref and V_lim