Salut à tous !
Voilà, j'utilise un circuit pour un chargeur.
et il a une partie de la doc que je n'arrive pas à traduire.
Je vous l'écris:
A bootstrap subcircuit with C5, R3 and Q3 is used to improve the turnoff time of Q1 to minimize switching losses. When VCH is pulled low to turn on Q1, C5 is charged through the R6/R3 path. When VCH is left open-circuit to turn off Q1, the voltage of the VCH node jumps up close to the gate voltage of Q1. This causes the gate of Q3 to be pushed up due to the voltage across C5. Q3 is then turned on, which helps to speed turn-off of Q1 by discharging its internal capacitances. The values of the components in this section of the circuit are tuned to work with the chosen transistors. The values of R6 and R9 should be chosen so that no more than 20mA is sunk by VCH. D4 is used to clamp the inductive spike that could occur if the batteries are removed during charging. This function can also be served by an energy absorbing capacitor placed in parallel with the battery stack.
Merci de bien vouloir me donner un petit coup de main car je n'y arrive vraiment pas.
Merci
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