IRFS4321-7PPBF Datasheet, PDF (5/10 Pages) International Rectifier – Motion Control Applications

IRFS4321-7PPbF
1
D = 0.50
0.1
0.20
0.10
0.05
0.02
0.01
0.01
0.001
1E-006
SINGLE PULSE
( THERMAL RESPONSE )
_{J J}
_{1 1}
R_1R1
Ci= iRi
Ci= iRi
R_2R2
_{2 2}
R_3R3
Ri (°C/W) (sec)
_{C 0.085239 0.000052}
_{3 3}
0.18817 0.00098
0.176912 0.008365
Notes:
1. Duty Factor D = t1/t2
2. Peak Tj = P dm x Zthjc + Tc
1E-005
0.0001
0.001
0.01
0.1
t1 , Rectangular Pulse Duration (sec)
Fig 13. Maximum Effective Transient Thermal Impedance, Junction-to-Case
100
Duty Cycle = Single Pulse
0.01
Allowed avalanche Current vs avalanche
pulsewidth, tav, assuming Tj = 150°C and
Tstart =25°C (Single Pulse)
10
0.05
0.10
Allowed avalanche Current vs avalanche
1 _{pulsewidth, tav, assuming  j = 25°C and}
Tstart = 150°C.
0.1
1.0E-06
1.0E-05
1.0E-04
1.0E-03
tav (sec)
Fig 14. Typical Avalanche Current vs. Pulse width
1.0E-02
1.0E-01
120
TOP
Single Pulse
BOTTOM 1% Duty Cycle
100
ID = 50A
80
60
40
20
0
25
50
75
100 125 150 175
Starting TJ , Junction Temperature (°C)
Notes on Repetitive Avalanche Curves , Figures 14, 15:
(For further info, see AN-1005 at www.irf.com)
1. Avalanche failures assumption:
Purely a thermal phenomenon and failure occurs at a
temperature far in excess of T_jmax. This is validated for every part type.
2. Safe operation in Avalanche is allowed as long asT_jmax is not exceeded.
3. Equation below based on circuit and waveforms shown in Figures
23a, 23b.
4. P_{D (ave)} = Average power dissipation per single avalanche pulse.
5. BV = Rated breakdown voltage (1.3 factor accounts for voltage
increase during avalanche).
6. I_av = Allowable avalanche current.
7. T = Allowable rise in junction temperature, not to exceed T_jmax
(assumed as 25°C in Figure 14, 15).
t_av = Average time in avalanche.
D = Duty cycle in avalanche = tav ·f
Z_thJC(D, t_av) = Transient thermal resistance, see Figures 13)
PD (ave) = 1/2 ( 1.3·BV·I_av) = T/ Z_thJC
I_av = 2T/ [1.3·BV·Z_th]
E_{AS (AR)} = P_{D (ave)·}t_av
Fig 15. Maximum Avalanche Energy vs. Temperature
5 www.irf.com © 2013 International Rectifier
June 14, 2013