- Selection of IGBT driver by use of IGBT datasheet
- For example: IGBT driver for Infineon IGBT module FF450R17KE4
Calculation of Gate Driver Power
Gate drive power
- PGate = QG * fsw * ΔV
Use of CGE<
- Additional power by use of optional CGE
- PCge = CGE * fsw * ΔV2
Total driver output power
- P = PGate + Pcge
Example with FF450R17ME4
- Gate charge 4.6 μC
- No CGE
- Switching frequency 4 kHz
- P = 4.6 μC * 4 kHz * 25 V
- P = 0.46W
Calculation of Gate Current
Minimum gate resistor
- Rmin = RG min + RInternal
- Most of IGBT have embedded chip resistance
Peak output curent
- Imax = 0.74 .ΔV /( RG min + RInternal )
Example with FF450R17ME4
- P = PGate + Pcge
- RGmin = 3.3Ω
- RInternal = 1.7Ω
- ΔV = 25V
- Imax = 0.74*25V / 5 Ω
- Imax = 3.7A
The theoretically derived reduction factor of 0.74 for Imax (non-osc) is further reduced in real applications by the limited driver switching speed, the transmission line nature of real gate loops, and the internal time constants of the driver's blocking capacitors.
Gate Driver Selection
Values for example with FF450R17ME4
- Blocking Voltage 1700V
- Gate drive power P = 0.46W
- Gate current ± Imax = 3.7A
Driver selection
- https://gate-driver.power.com/
- Home >> Products >> Product Finder
- Driver core
