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Original question:

USB-PD-CHG-EVM-01: Can i fix the output at 20V , 3A?

USB-PD-CHG-EVM-01: 3A charging current

Kiran Kerai
Prodigy 200 points
Part Number: USB-PD-CHG-EVM-01
Other Parts Discussed in Thread: TIDA-050047, BQ25792

We are using a board designed around TIDA-050047 with 2oz copper.

With 20V negotiated on VBUS and 10V on 3S batteries, I am only able to charge at 1.5A before bq25792 die temperature exceeds TSHUT (150deg) and shuts down. There is no system load in my design, only battery.

Can anyone confirm the TIDA-050047 can handle 3A with Vbus=20V and Vbatt=10V (charging up to 12.6V)?

Thanks in advance.

  • 0
    TI__Mastermind 40305 points

    Hello,

    I can confirm that with a 20 V PD contract the BQ25792 can charge a 12.6 V regulated battery voltage. In my test the battery was 10 V in CC mode and had 2.96A of charge current.

    Please note that if you have a battery voltage of say 5 V and your SYSMIN is 10 V, you will attempt to drop 5V*3A across the BATFET and this will cause the die to heat up.

    Regards,

    Mike Emanuel

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