Datasheet IRF2804, IRF2804S, IRF2804L (International Rectifier) - 7

IRF2804/S/L 10000 Duty Cycle = Single Pulse 1000 ) Allowed avalanche Current vs A( t avalanche pulsewidth, tav n e assuming ∆ Tj = 25°C due to rr 0.01 u avalanche losses. Note: In no C 100 case should Tj be allowed to e h exceed Tjmax c n 0.05 al a 0.10 v A 10 1 1.0E-07 1.0E-06 1.0E-05 1.0E-04 1.0E-03 1.0E-02 1.0E-01 tav (sec)
Fig 15.
Typical Avalanche Current Vs.Pulsewidth 800
Notes on Repetitive Avalanche Curves , Figures 15, 16:
TOP Single Pulse
(For further info, see AN-1005 at www.irf.com)
BOTTOM 10% Duty Cycle 1. Avalanche failures assumption: ) J ID = 75A Purely a thermal phenomenon and failure occurs at a m 600 ( temperature far in excess of Tjmax. This is validated for y g every part type. r e 2. Safe operation in Avalanche is allowed as long asT n jmax is E not exceeded. e h 400 3. Equation below based on circuit and waveforms shown in c n Figures 12a, 12b. al a 4. PD (ave) = Average power dissipation per single v A avalanche pulse. , 5. BV = Rated breakdown voltage (1.3 factor accounts for R 200 A voltage increase during avalanche). E 6. Iav = Allowable avalanche current. 7. ∆T = Allowable rise in junction temperature, not to exceed T 0 jmax (assumed as 25°C in Figure 15, 16). tav = Average time in avalanche. 25 50 75 100 125 150 175 D = Duty cycle in avalanche = tav ·f Starting TJ , Junction Temperature (°C) ZthJC(D, tav) = Transient thermal resistance, see figure 11)
PD (ave) = 1/2 ( 1.3·BV·Iav) =
D
T/ ZthJC Iav = 2
D
T/ [1.3·BV·Zth] E Fig 16.
Maximum Avalanche Energy
AS (AR) = PD (ave)·tav
vs. Temperature www.irf.com 7