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TPS1HB16-Q1: questions

Genius 4660 points
Part Number: TPS1HB16-Q1

1.SNS

When output overcurrent happen,Vout is shutdown.

After this, what information SNS pin indicate ?

 

2.Power on sequence

 After VBB is applied,Do other input pins have any power on sequence ?

If you have reccomend power on sequence ,please let us know it.

 

3.Rprot

Rprot is reccomennded  15kohms in datasheet.Does this depend on MCU VCC?

Customer will use 3.3V MCU. Please let us know recceomend Rprot value in 3.3V case.

 

4.DIA_EN

They use TPS1HB16-Q1 1pc. They consider to use with DIA_EN is always high.

Does this cause any problem  ? If there is power on sequence ,this cause any problem.

  • Hi Kura, 

    1.SNS

    When output overcurrent happens, Vout is shutdown. After this, what information SNS pin indicate?

    - When any of the protection mechanisms are activated, the device enters the FAULT state. Fault indication will be available in the SNS pin. The value of this current is indicated in the datasheet as Isnsfh. Page 28 of the datasheet provides more information on these protection mechanisms. The following table provides an indication based on which device would be used. 

    2.Power on sequence

     After VBB is applied, Do other input pins have any power on the sequence?  If you have a recommended power-on sequence, please let us know it.

    - There is not a specific power-up sequence for the device. However, it is important to ensure that DIA_EN and EN pin have settled before SNS current is used. For more information here visit page 16 of the datasheet. 

    3.Rprot

    Rprot is recommended  15kohms in the datasheet. Does this depend on MCU VCC? The customer will use 3.3V MCU. Please let us know the recommend Rprot value in the 3.3V case.

    - For a 3.3V MCU TI recommends a 4.7k ohms resistor. However, to ensure proper protection of the microcontroller the following equation can be used to calculate the current on the MCU pin. 

    Iprot = (Vbatt - Vf_MCU - Vesd_hss)/Rprot

    Typically we recommend 10k ohms for most devices since this will protect most MCUs, but if you would like more information here access the following document, page 4. 

    https://www.ti.com/lit/an/slvae55/slvae55.pdf?ts=1609171838881&ref_url=https%253A%252F%252Fwww.ti.com%252Fpower-management%252Fpower-switches%252Fhigh-side-switches%252Fapplications.html

    4.DIA_EN

    They use TPS1HB16-Q1 1pc. They consider to use with DIA_EN is always high. Does this cause any problem? If there is power on sequence, this cause any problem

    - It is OK to pull DIA_EN high, but the power consumption for the device will be slightly higher. In addition, if DIA_EN is high while the switch is disabled and the load is disconnected or there is a short battery, the Vout voltage will be higher than the open load threshold and a fault will be indicated in the SNS pin. 

    If this answers your query, Please click "This resolved my issue" button.

    Sincerely, 

    Francisco Lauzurique 

  • Francisco-san

    Thank you for your support.

    Please let us know the behavior of this IC when output overcurrent happens. 

    When output overcurrent happens, Vout is shutdown. After this, SNS pin indicate output curremt level(preset over current value) .

    Is my understanding correct ?

  • Hi Kura, 

    When the overcurrent event happens, the switch will be disable immediately. While the device is in FAULT state, the SNS pin will have a current equals to Isnsfh. The pin will not report the overcurrent value. Page 7 of the datasheet specifies the value of the fault high output current.