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TPS7B7702-Q1: behavior if VSENSE value is higher than 2.4V but below Ilim value

Shinji Tsuji
Genius 12378 points
Part Number: TPS7B7702-Q1

Hi team,

Could you clarify the behavior if VSENSE value is higher than 2.4V, but is below Ilim value?

For example, 

Normal operation current = 50mA to 100mA

Short to GND > 150mA (set Rlim >150mA)

Rsense = 2.3V x 198/110mA = 4.14=3.9kohm

If 130mA current flow, Vsense = 130mA/198*3.9kohm=2.56V 

which is above "Short to GND" threshold, but it doesn't hit the current limit. 

In this case, switch continues ON, current limit is not triggered, /ERR is High, VSENSE is clamped n between 2.4V to 2.65V.

Is my understanding correct?

regards,

  • +1
    TI__Genius 12040 points

    Hello,

             Yes, your understanding is correct. Even though for a load current of 130mA, the resulting voltage at the sense pin (2.56V) is above or close to the Short to GND threshold, the LDO will not flag it as an error state and the ~ERR pin will stay high. However if an event occurs where the device hits current limit (e.g. OUT pin shorting to GND), the voltage at the SENSE pin will clamp to ~2.55V and the LDO will flag it as an error state by sending the ~ERR pin low.

    Regards,

    Srikanth