This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS1HC100-Q1: functions

Genius 4720 points
Part Number: TPS1HC100-Q1

Our customer is considering to use TPS1HC100BQPWPRQ1.

They have some questions.

1.About the current sense (detection) function
To enable the current sense function, should I input "Hi" to the DIAG_EN terminal?
Is it correct to say that the current sense function does not sense periodically, but continues to sense constantly?

2.About LATCH function
If "Hi" is input to the LATCH terminal, the operation will be stopped when overheating is detected, but if "Lo" is input, the operation will be stopped when the overheating is removed.

3.About SNS terminal connection resistance
The application information on datasheet P41 uses "1kΩ", but is it possible to change it depending on the current range they want to detect?
They would like to connect 2.7k to 10kΩ, but are there any restrictions on the resistance value?

4.About ILIM terminal connection resistor
Datasheet P8 lists the specifications for three patterns of RILIM: "7.15kΩ/25kΩ/71.5kΩ".
Is there any material such as a characteristic graph or list of RILIM vs. KCL? RILIM is planning to connect E24 series resistor.

5.About GND terminal connection diode and resistor
In Figure 9-1 of the application information of data sheet P40, a diode and a resistor are connected in parallel to the GND terminal.
Is this connection for some kind of protection?
If protection is not required, is it okay to remove the diode and resistor?

Regards,

Kura

  • Kura,

    Please see the answers below:

    1. This is correct. It works like a current mirror that constantly outputs a scaled down current (as long as DIAG_EN is high) on the SNS pin. 
    2. When it is low, it is in auto-retry mode and will automatically restart when the temperature drops below the hysteresis number or when the device's overcurrent condition is removed (if it has not yet reached thermal shutdown).
    3. No restrictions and the resistor is intended to be customized based on the application. Note that when a fault condition occurs, the voltage on the SNS pin is pulled up to whatever the logic level of the digital pins is.
    4. Find below:
      TPS1HC100 ILIM Calculator.xlsx
    5.  The diode/resistor is there for reverse current protection. If there is any potential for reverse current, the recommendation is to either have the diode/resistor network on the ground pin or a PFET/ideal diode on the supply rail. See 8.3.4.10 Reverse Current Protection for more details.

    Best Regards,
    Tim