STGB7NC60HD, STGF7NC60HD, STGP7NC60HD

Electrical characteristics

Doc ID 10042 Rev 10

9/22

2.2

Operating frequency

For a fast IGBT suitable for high frequency applications, the typical collector current vs.

maximum operating frequency curve is reported. That frequency is defined as follows:

Equation 1

fMAX = (PD - PC) / (EON + EOFF)

The maximum power dissipation is limited by maximum junction to case thermal resistance:

Equation 2

PD = ΔT / RTHJ-C

considering

ΔT = TJ - TC = 125 °C- 75 °C = 50°C

The conduction losses are:

Equation 3

PC = IC * VCE(SAT) * δ

with 50% of duty cycle, VCE(sat) typical value TC = 125°C.

Power dissipation during ON & OFF commutations is due to the switching frequency:

Equation 4

PSW = (EON + EOFF) * freq.

Typical values TC = 125°C for switching losses are used (test conditions: VCE = 390 V,

VGE =15 V, RG = 3.3 Ω). Furthermore, diode recovery energy is included in the EON, while

the tail of the collector current is included in the EOFF measurements.

Figure 18.

IC vs. frequency