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BQ25570EVM-206: BQ25570 Q&A

Sanghyun JOO
Prodigy 190 points
Part Number: BQ25570EVM-206

We set the voltage of the power supply to 600 mV and the current to 1 mA size.

The set value was measured by putting it on the board. The pin settings on the board prior to insertion have no load connected to /EN = GND, VOUT_EN = VSTOR, or VBAT.

The actual measurements then obtained were VBAT = 508 mV, VSTOR = 15.6 mV and VOUT = 13.6 mV.

In the next experiment, the measurement was made by connecting a 2V charged capacitor to the VBAT so that it could bypass COLD START mode.

VBAT = Slowly decreased at 2V, VSTOR = 16mV and VOUT = 16.4mV. I don't know why the measurement comes out so low.

So I made a measurement with an oscilloscope to check if the LBOOST pin is switched, and I want to confirm whether the picture above is measured correctly.

If the LBOOST pin doesn't work, I want to know how to go through the next step and proceed correctly.

  • 0
    TI__Guru**** 167086 points

    Sanghyun,

    LBOOST is pulsing.  The waveforms look correct for cold start.

    Regarding attaching a partially charged simulated battery, you must do that when VSTOR=VBAT is < 100mV.  In other words, you cannot dynamically attach the battery while an input source is attached.  

    Is the power source that you are using to simulate the battery capable of sinking current? If not, the battery voltage will be clamped and/or may overvoltage. 

    Datasheet figure 22 and 23 are great examples showing how the charger operates over a longer time.  

    Regards,
    Jeff