Operating Frequency Information Operating frequency information for a typical device (Figure 3) is presented as a guide for estimating device performance for a specific application. Other typical frequency vs collector current (ICE) plots are possible using the information shown for a typical unit in Figures 5, 6, 7, 8, 9 and 11. The operating frequency plot (Figure 3) of a typical device shows fMAX1 or fMAX2; whichever is smaller at each point. The information is based on measurements of a typical device and is bounded by the maximum rated junction temperature. fMAX1 is defined by fMAX1 = 0.05/(td(OFF)I+ td(ON)I). Deadtime (the denominator) has been arbitrarily held to 10% of the on-state time for a 50% duty factor. Other definitions are possible. td(OFF)I and td(ON)I are defined in Figure 21. Device turn-off delay can establish an additional frequency limiting condition for an application other than TJM. td(OFF)I is important when controlling output ripple under a lightly loaded condition. fMAX2 is defined by fMAX2 = (PD - PC)/(EOFF + EON). The allowable dissipation (PD) is defined by PD = (TJM - TC)/RJC. The sum of device switching and conduction losses must not exceed PD. A 50% duty factor was used (Figure 3) and the conduction losses (PC) are approximated by PC = (VCE x ICE)/2. EON and EOFF are defined in the switching waveforms shown in Figure 21. EON is the integral of the instantaneous power loss (ICE x VCE) during turn-on and EOFF is the integral of the instantaneous power loss (ICE x VCE) during turn-off. All tail losses are included in the calculation for EOFF; i.e., the collector current equals zero (ICE = 0).

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