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Original question:

BQ77915: Schematic design review

BQ77915: Difference between primary protector and secondary protector

Naizeng Wang
Expert 3745 points
Part Number: BQ77915
Other Parts Discussed in Thread: BQ2970, BQ77905, BQ77216, BQ7718, BQ77207

Hi team.

What's hte difference between primary protector and secondary protector? Thanks!

Nison

  • 0
    TI__Expert 3745 points

    And what's the difference between monitor and protector?

  • +1 in reply to Naizeng Wang
    TI__Expert 8451 points

    Hi Naizeng,

    First, you may find this video helpful: Battery Protector, Monitor, or Gauge? | TI.com Video.

    Primary vs. secondary protector:

    • Primary protectors can be the only protector in a system.  They do not have to be paired with another protector or monitor.
      • Ex: BQ2970, BQ77905, BQ77915, etc.
    • Secondary protectors must be used in a system with a primary protector or monitor.  They cannot be the only device providing protection to the system.
      • Ex: BQ7718, BQ77207, BQ77216, etc.

    Monitor vs. protector: 

    • Protectors offer simple, hardware-based solutions that address unsafe conditions by blowing a fuse or opening FETs. 
    • Monitors are capable of being programmed to meet customer needs and provide system information to the user, such as cell voltages and system current.  This information can be used by the monitor to open FETs or blow a fuse, but it also can simply provide the user with information about their system and battery pack.

    Hopefully this helps!

    Best,

    Andria