Battery charge with bq2000

Discussion in 'The Projects Forum' started by gianko, Aug 20, 2006.

  1. gianko

    Thread Starter New Member

    Aug 19, 2006
    I am starting new project for a NiMh (and LiIon in the future) battery charge with a bq2000 from Texas.
    I have downoaded the datasheet and I have read the sample schematic at page 8 but I have some questions.

    1.- I don't understand the C7 function.
    2.- The components Q2/D5/C9 are used only when Q1 swicth on/off ?
    I am not sure but I think D5 C9 are used when switch on, and Q2 discharge C9 in OFF fase In this fase D5 is always offs. Correct ?
    But if yes how I can calculate this network ?

    Thanks for help