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TPS2H160-Q1: current sense pin function

li longfei
Prodigy 25 points
Part Number: TPS2H160-Q1

In TPS2H160-Q1 data sheet it mentioned the current sense function described as below:

A wide linear region from 0 V to 4 V allows a better real-time load-current monitoring. The CS pin can also report a fault with pullup voltage of V CS(H) .

When use current sense mode  the CS pin connected to MCU's pin with  ADC capability .

then there are 3 situations :

1) Vcs < 4V , the MCU can monitor the current correctly .

2)4<Vcs < 4.5V (Vcs (H,min))the Vcs out of linear region ,but Figure 24 still shows a liner ramp up. it should not be a linear ramp up am I right ?

3) when Vcs reaches 4.5V it will run in to fault mode , but CS pin connected to a MCU ADC pin how CS pin report a fault ?

thanks

  • 0
    TI__Genius 16390 points

    Hi Longfei,

    Let me clarify. The CS pin is an output pin. When there's no fault happening, it will output voltage scaled with sensed current. When there's a fault, it will output the voltage of Vcs(H). 

    When you design your system, you should have the current sense resistor (convert the sensed current to voltage) chosen so that when max current flows in the circuit, the voltage output from CS pin will still be lower than Vcs(H) so you are not confused between a sensed current and the fault situation. It should still be linear between Vcs(Iin,max) and Vcs(H,min), but you should choose the CS resistor so there's a gap between the two.

    When there's a fault, the CS will then output a Vcs(H) to notify the microcontroller that there's a fault happening.

    Please let me know if you have additional questions.

    Regards,

    Yichi

  • 0 in reply to Yichi Zhang.
    Prodigy 25 points

    Hi Yichi

    Thanks , The VCS is always linear before VCS(H) , to avoid mess a fault and a real sense current I should make sure the reasonable max current set point is 4V or below. At the same time if I set the current limit to  where the VCS is 3V the CS pin will jump from 3V to VCS(H) when current limit fault occurs ,is that right ?

    Another question ,the current limit is set for each channel not the sum of the two channel . Is that correct?

    Thanks

  • +1 in reply to li longfei
    TI__Genius 16390 points

    That's correct understanding. And yes, the current limit is per channel.

    Regards,

    Yichi