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Why dont you use leds instead of glow lamps in the BQ76920?

Paul K52
Intellectual 640 points
Other Parts Discussed in Thread: BQ76920, TIDA-00792

Hello, 

refering to the BQ76920 EVM, on page 36, there are devices, which have the names E4, E2, E3 and E1. I guess these devices are glow lamps, is that correct?

Why dont you use LED's instead of glow lamps?

Is there a specific reason for this?

It was not possible for me to write a part number in the box, I dont know why.

  • 0
    TI__Guru 54715 points
    Hi Paul,
    The "E" reference designators on the EVM schematic are spark gaps. These are uninsulated controlled spacing contacts which will arc at sufficient voltage to reduce ESD to the remaining circuit. Note that the EVM may show a spark gap across the FETs, this can be undesirable since it is a contamination opportunity which would bypass the protection FETs. Some designers do not like spark gaps since they are a defect opportunity and would prefer to use a component for further ESD suppression.
    Sorry to hear the tool won't allow the part number entry. Hopefully the tool is fixed soon.
  • 0 in reply to WM5295
    Intellectual 640 points
    Thanks for your response.
    In case of using an ic instead of uninsulated contacts, which ESD protection ic could you recommend to me?
  • 0 in reply to Paul K52
    TI__Guru 54715 points
    Hi Paul,
    See TIDA-00792 for an example of ESD devices on the signal lines. You might see www.ti.com/esd. Power signals may use other techniques, consult references on transient protection or protectors.