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BQ24314: BQ24314

Yoav Tzafrir
Prodigy 50 points
Part Number: BQ24314
Other Parts Discussed in Thread: BQ24308

Hi,

We are using the BQ24314 P.N in our application as an overload and an over voltage protection circuit, see below.

BQ24314

The OUT pin supplies voltage to an electrical circuit with an approximated equivalent of 150uF total capacitance (the limit current is configured for 285mA).

The on/off operation is made using a slide switch (which has a bouncing effect while closed).

The BQ24314 works properly most of the time, but occasionally gets into a protection mode (completely shuts down until we disconnect and connect the input supply back again).

The output current measurement made during the shutdown showed that the OCP condition (15 cycles according to the datasheet) do not happen at all.

Only a single current limiting period (marked in purple) was captured.

Note: the input voltage is stable, with a 1V drop (from 5V to 4V) so no input overvoltage happens.

A question please - Is there any errata sheet describing this phenomenon? Did anyone encounter a similar phenomenon with this chip?

 BR,

Yoav

  • 0
    TI__Expert 8526 points

    Hi Yoav,

    I noticed that you said you are using this device for OVP, but you have VBAT tied to GND, which means BAT OVP is not being used.

    For the slide switch, where is this connected?  My apologies, but I did not see it on the schematic snip.

    Finally, since you mentioned that the device was occasionally having this shutdown entry, are you sure that the OCP counter is being reset?  There is a chance it is not clearing, and the counter is slowly being incremented until the 15th event triggers shutdown.  I would carefully observe the part to see if you can count the number of OCP events that occur before the part must be reset.

    Best,

    Andria

  • 0 in reply to Andria McIntyre
    Prodigy 50 points

    Hi Andria,

    Thanks.

    We realized that it is probably the counter reaching 15 times of OCP...

    Anyway, we ordered a similar chip to test, the BQ24308; hopefully this will solve our case.

    BR,

    Yoav

  • 0 in reply to Yoav Tzafrir
    TI__Expert 8526 points

    Hi Yoav,

    I'm glad to hear you may have identified the issue, and hopefully your system issues will be resolved soon.

    Best,

    Andria