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TIDA-00449: A few questions about this design.

Part Number: TIDA-00449
Other Parts Discussed in Thread: BQ76930

Hi experts, 

I'm designing my BQ76930 battery packet board refering to this TI ref design.   I have a few questions about this design, please kindly help guide.

1.  Is this D15 for ESD protection? what is the purpose to  used  3 different ESD protections between  pack+ and pack-? 

2. D15 [MURS360T3G] is a fast recover diode,  why use this instead of a TVS?  

3. How do you choose the value of the cap C23,C25?  in this design , the value is 0.1uF. Can I use a capacitor with a larger capacitance? such as 4.7uF.


4. About the spark gap usage,  see it is used between [PACK+] and [PACK-].  but these nodes supplies relatively high DC voltage and current. could you please suggest if there are some  risk? i ask this is becasue from below AN, seem spark gap are commonly used for protecting communcation line.