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BQ24610: BQ24610EVM

Part Number: BQ24610
Other Parts Discussed in Thread: , TPS65987D

Hi Team,

I will be happy to get your help with the bring up of BQ24610EVM.

I have connected 5 Bat (Sumsung INR18650-25R - data sheet attached) to the BQ24610EVM:

It seems that the BQ24610 dose not detect the battary and doesn't start the charging.

 

Battary power 9.4V, (Disconnected from the BQ24610)  

 

My test results:

  • Power in 24V
  • VSYS 24V as the input,
  • Vbat with or without out the battary 900mV
  • ACDRV 19V
  • ACSET 807mV
  • BATDRV 24V
  • ISET2 300mV
  • PG 40mV
  • TTC 0V
  • RECN 6V
  • ISET1 600mV
  • VCC 24V
  • Stat1,Stat2 &  3.6V
  • Chgen 3.3V
  • VREF 3.3V
  • TS 3.23V

 

Battary power 9.4V, (Disconnected from the BQ24610)  

 

No Power input

  • VSYS 1.45V as the input,
  • Vbat 1.67V

 

I expected to see Discharge Cycles But I don't see it.

BQ24610EVM.docx

Please help me to understand what is the problem.

Thanks,

Shlomi


 

4628.130109_INR18650-25R Cell SPEC (3) (1).pdf

 

  • Hey Shlomi,

    This even does not have the TS pin thermistor installed natively on the board.

    You will need to either provide a voltage within the valid %VREF range of the TS pin or place a parallel resistorfrom TS to PGND in order for charging to function. A 10-kOhm typically will work fine for this.


    Regards,
    Joel H
  • Hi Joel,

    Attached you can find my schematic for review.

    I will be happy to get your input.

    Open Items:

    1: is it recommended to connect directly from the connector (TypeC) to BQ24610 input?

    2: In the charger EVM BQ24610 I have seen some capacitors without a value. (marked with circle) Do we need them? What is the recommended value?

    3: From EMI/RFI point of view. Do we need to add any Filter?

    Thanks,

    Shlomi

    flashlight_charger_v1_241218.pdf

  • Shlomi,

    I understood that you were using an EVM and trying to bring that up. Is that still true?

    1. I believe you may connect directly to the type-C connection and the USB port will default to some standard port. But the voltage should be usuable without enumeration.

    2. If you look at the Bill of Materials, you will find that these components are unpopulated. There are not needed for basic operation.

    3. If you find your board is not meeting certain EMI criteria, you may consider adding decoupling capacitors, a snubber on PH, and a series resistor with the Bootstrap capacitor.


    Regards,
    Joel H
  • Hi Joel,
    Thanks for your answers
    Sorry but Didn't understand: some items

    I understood that you were using an EVM and trying to bring that up. Is that still true?
    Yes I using TI EVB: BQ24610, TPS55340EVM, TPS65987D

    1 . I believe you may connect directly to the type-C connection and the USB port will default to some standard port. But the voltage should be usuable without enumeration.
    What is the requirement from TypeC Connector input? "But the voltage should be useable without enumeration "But the voltage should be useable without enumeration"

    2 . If you look at the Bill of Materials, you will find that these components are unpopulated. There are not needed for basic operation.
    Thanks I will fix it.

    3 . If you find your board is not meeting certain EMI criteria, you may consider adding decoupling capacitors, a snubber on PH, and a series resistor with the Bootstrap capacitor.

    It will be helpful if you could refer me where to add? recommendation value? of the Snubber & the series resistor of the Bootstrap


    Thanks,
    Shlomi
  • Hey Shlomi,

    1. The USB port will have a D+D- line to enumerate the data connection, if one is required. However, even without enumeration you may draw power from a USB port. In other words, the voltage rail from the USB connection (type-C connector or otherwise) can be used to power your devices. There are obviously current limitations that dictate certain types of USB ports an their power output.

    3. Take a look at these two documents to help you select and place components to mitigate EMI. Just note that the gate drivers that are described in these application notes are integrated in our charger via LODRV and HIDRV pins.
    www.ti.com/.../slyt465.pdf
    www.ti.com/.../slyt740.pdf


    Regards,
    Joel H