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TPS25762Q1EVM: TPS25762-Q1 some question

Lawrence He
Genius 3105 points

Part Number: TPS25762Q1EVM

Hi, Support Team

We reference TPS25762EVM and design target is to support 27W power for down device.

 

Q1: For calculation Vin power consumption is about 12V, 2.81A

Want to confirm is it ok to use 3x10uF 0603 & 2x0.1uF 0402 for Cin capacitor.

Q2:By reference TPS25762EVM-146 schematic, What’s the purpose for R8 0.001 ohm resistor?

Want to confirm is it ok to use one 0.01 ohm 2010 for shunt resistor + 3x10uF 0603 & 1x4.7uF 0603 & 2x0.1uF 0402 for Cout capacitor.

EVM schematic:

our schematic:

Q3:What’s the purpose for pin:9 PA_LSGD?

If not used how to deal with this pin?

 

Q4: GPIO5_NTC is not used, will pull-down with 4.7K ohm resistor

Below six pins were not used, is it ok for floating?

PA_PD_GPIO8 left floating

PA_PM_GPIO7 left floating

GPIO0_HPD left floating

GPIO1_IRQ2(0) left floating

GPIO6_SYNC left floating

GPIO9_IRQ_N left floating

Q5:

For online send register bin file from MCU to EEPROM via TPS25763-Q1 I2C2

Should it required to have online TVSP index selection control 0~8?

Or could we just left RTVSP OPEN for fix with index 0?

if any suggestion, Please advise me.

Thanks,

Best regards,

Lawrence

  • 0
    TI__Mastermind 46181 points

    Hi Lawrence.

    1. That's fine. See Section 7.4 in the datasheet. 
    2. R8 is simply a 0-ohm resistor used to bypass the DNP'ed MOSFET tied to pin 9.
      1. Regarding the 10mΩ resistor, ensure it is with 1% tolerance. 2010 case is fine.
      2. See Section 7.4 in the datasheet. C_BUS should range from 100~150uF. 
    3. Pin 9 can be used as a charge pump output for external NFET for V_BUS bulk capacitance blocking. You can leave it as a N.C. if not used.
    4. If NTC is not used, yes, you can use that pull down resistor. If any of the GPIO pins listed are not used, leave it as N.C.
    5. If you do not need other options aside from Index 0, yes, you can simply leave RTVSP as an open. But ensure the recommended components under Table 9-2 in the datasheet is followed. 

    BR,

    Seong

  • 0 in reply to Seong Kim
    TI__Mastermind 18556 points

    Hi Lawrence,

    Seong has a very good answer about your questions, one more point need to add, for your question 5, when you want to update the firmware using MCU send to EEPROM, you need to set the TVSP index to 1,3,5,7, when you finish to update the firmware, you can set to index 0 again, and re-power our device, then the new firmware will be loaded in our device from the EEPROM.

    Best Regards,

    Kuno

  • 0 in reply to Kuno Wu
    TI__Mastermind 46181 points

    Thank you, Kuno. 

    -Seong