Battery charge with bq2000

Thread Starter


Joined 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