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Gate charge
Because the Gate (G) input terminal of a MOSFET is insulated, the amounts of charge Q seen from the Gate are important characteristics. Figure 1.5 illustrates the definitions of gate charge characteristics.
Total gate charge Q g
The amount of charge to apply voltage (from zero to designated voltage) to gate
Gate-source charge 1 Q gs1
The amount of charge required for a MOSFET to begin to turn on (before dropping drain-source voltage)
Gate-drain charge Q gd
The amount of gate charge charged in the Miller plateau
Gate switch charge Q sw
The amount of charge stored in the gate capacitance from when the gate-source voltage has reached V th Until the end of the Miller plateau
Output charge Q oss
Drain-source charge
The definition of the gate charge amount is shown in the figure below.
Data sheet description
Characteristics | Symbol | Test Conditions | Min | Typ | Max | Unit |
---|---|---|---|---|---|---|
Total gate charge | Qg | VDD ≈ 20 V, VGS = 10 V, ID = 50 A | — | 103 | — | nC |
VDD ≈ 20 V, VGS = 4.5 V, ID = 50 A | — | 49 | — | |||
Gate-source charge 1 | Qgs1 | VDD ≈ 20 V, VGS = 5 V, ID = 50 A | — | 25 | — | |
Gate-drain charge | Qgd | — | 12.4 | — | ||
Gate switch charge | QSW | — | 23 | — | ||
Output charge | QOSS | VDS = 20 V, VGS = 0 V | — | 85.4 | — |