release time:2022-03-17Author source:SlkorBrowse:724
Today, I share four common MOS transistor gate driving circuits. Have they all been used?1. IC direct drive typeThe direct driving of this power IC is the most common and simplest driving mode.
Fig. 1 IC directly drives MOS gate
Using this method, we should pay attention to several parameters and their effects.
First, check the power IC manual for the maximum peak driving current, because different IC chips have different driving capabilities.
Secondly, check the parasitic capacitance of MOSFET, such as C1, C2 and C3 in the figure. If the capacitance is large, the energy required to turn on the MOS tube is also large.
If the power IC does not have enough peak drive current, the transistor will turn on at a slower speed.If the driving capability is insufficient, high-frequency oscillation may occur at the rising edge, and even reducing Rg in Figure 1 will not solve the problem! However, IC driving ability, parasitic capacitance of MOSFET, switching speed of MOSFET and other factors will also affect the choice of driving resistance, so Rg cannot be reduced indefinitely.
2. totem pole circuit enhances driving.The function of the driving circuit is to increase the current supply capacity and quickly complete the charging process of the gate capacitor input. This topology increases the turn-on time, but reduces the turn-off time, and the switch tube can be turned on quickly, avoiding the high-frequency oscillation of the rising edge.
Figure 5 High-side MOSFET driver circuit
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