• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 63 subscribers
  • Views 378 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ24450 pass transistor

Dilbagh Singh
Intellectual 330 points
Other Parts Discussed in Thread: BQ24450

Hello,

Can somebody explain the importance of meeting the minimum VCE requirement (0.6V for Common emitter PNP)?

How will it impact my circuit if I cant meet this limit?

Input : 24-29V adaptor output

Output : 18AH 24 V battery

I max= 2.25A (C/8)

Transistor selected : 2STA1943 (STM)

  • 0
    TI__Mastermind 31120 points

    The drop from the emitter to collector of the pass transistor will be up to 0.5V so if one does not want to go into drop out, then the input should be greater than the battery voltage by >0.5V.

    If the drop is less than this the CC will roll off.

     

  • 0 in reply to Charles Mauney
    Intellectual 330 points

    Thanks Charles.That question has been resolved.

    Another Question though,what will happen if I plug in the Charging source at one end without pluggin in the battery at the other end? Will the voltage at the collector continue to rise in the absence of a battery ?

    In my application :

    DC IN -->> BQ24450 (BATTERY) -->> LOAD

    If theres no battery in the circuit,how will the IC behave with a load(24V,1A) connected at the collector.

    Kindly throw some light.