TIDA-010030: about the Q22 function and the wake up circuit

user6501051

Part Number: TIDA-010030
Other Parts Discussed in Thread: BQ76200

I want to know the Q22 function.

When a right charge is attached, Q15 will be
turned on and pull TS1 high, and because of C20 and C18, Q15 will be turned off, generating a wake up
signal on TS1 pin.

about the because C20 and C18, can you explain?

over 3 years ago

0 Ryan Tan over 3 years ago

TI__Expert 3345 points

Hi,

Since D33 will block the sink current of BQ76200, we need another route to discharge the Ciss of CHG MOSFETs to turn off CHG MOSFETs when required. Q22 can give this route and turn CHG MOSFETs off. And the reason of adding D33 is to decrease the input current of CHG PIN of BQ76200 when BQ76200 is not powered on. please see more information from below document: https://www.ti.com/lit/an/slua795/slua795.pdf?ts=1626831444944&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FBQ76200

Thanks.

Best Regard,

Ryan

0 Ryan Tan over 3 years ago

TI__Expert 3345 points

Regarding C20 and C18, they will block the DC voltage and make TS1 low a while after charge is attached.

0 Ryan Tan over 3 years ago in reply to Ryan Tan

TI__Expert 3345 points

Hi,

If no more questions, I will close this E2E. Please ask a related question or new question if further questions.

Please click "This resolved my issue" if no more questions. Thanks.

Best Regards,

Ryan Tan

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TIDA-010030: about the Q22 function and the wake up circuit