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Original question:

BQ24616: BQ24616 CE low then plug in adapter PG blink

BQ24616: BQ24616 charge query

Star Xu
Genius 9645 points
Part Number: BQ24616

Hi

The customer design with BQ24616, When the output current of BQ24616 exceeds 4A, the charging led will blink if the battery is not connected.

Input adapter 28V/8A, charging voltage 25.2V@1.8A, battery is not connected.

This is the battery detection circuit under normal conditions (the output terminal is added with an electronic load, and the electronic load has a constant current of 2A)

This is the battery detection circuit under abnormal conditions (the output terminal adds an electronic load, the electronic load has a constant current of 4A)

Schematic as below:

Why the led will blink if the load is 4A?

Waiting for your reply.

Thanks

Star

  • 0
    TI__Mastermind 32455 points

    Dear Star,

    What is the input voltage doing in each case? Can you capture the two STATx pin, the battery voltage, and the input voltage all on the same plot?

    Thanks,

    Mike Emanuel

  • 0 in reply to Michael Emanuel35
    Prodigy 10 points

    Dear Michael，

    I got the reason of this problem , the input voltage is only  25.8V , and the charger voltage is 25.2V , and I control the input voltage at 27V, it's ok . And I have a question ,How much of the voltage difference at input voltage and charger voltage?

  • 0 in reply to kimi zhang
    TI__Mastermind 32455 points

    Hello,

    The below is excerpted from the Section 10, "Power Supply Recommendations:"

    "For proper operation of bq2461x, VCC must be from 5 V to 28 V. To begin charging, VCC must be higher than SRN by at least 500 mV (otherwise, the device will be in sleep mode). TI recommends an input voltage of at least 1.5 V to 2 V higher than the battery voltage, taking into consideration the DC losses in the high-side FET (Rdson), inductor (DCR), and input sense resistor (between ACP and ACN), the body diode drop of RBFET between VCC and input power supply, and battery sense resistor (between SRP and SRN). Power limit for the input supply must be greater than the maximum power required by either the system load or for battery charging (the greater of the two)."

    Thanks,

    Mike Emanuel

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