![]() ![]() Vrboot=Ibsr*Rboot Ibsr=7E-3A Rboot=25.5Ohm Would I do this by first finding the required current for the cap (1), or use the above Ibsr (2)? Vrboot=Ibsr*Rboot But Haven't decided on a value for Rboot yet. Ibsr=(Qg*f+Ileak)/D -Qg-gate capacitance(120E-9),f frequency = 3922, Ileak - DC current to be supplied to the gate driver high side circuitry (how would I find this? is it the IQBS Quiescent VBS supply current 230E-6A?), D - lowest duty cycle 10% The bootstrap diode, the drop across the low-side switch (Vds(on)drop). This says that the maximum voltage that the bootstrap capacitor (VBS) can reach is dependent on the volt drop across RBOOT, VF of I think I've confused C=I(dV/dt) with Q=CV :-?. Looking at it again with a fresh head this morning, I haven't a clue where that came from.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |