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STTA312B Datasheet(PDF) 7 Page - STMicroelectronics |
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STTA312B Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 8 page I F V F V Fp 1.1V F V F F dI /dt 0 0t t I Fmax tfr Fig. G : TURN-ON CHARACTERISTICS. Turn-on losses : P4 = 0.4 (VFP -VF)x IFmax xtfr xF Turn-on losses : (in the transistor, due to the diode) P5 = VR × IRM 2 × (3+2 × S) F 6 xdIF ⁄ dt + VR × IRM × IL ×(S + 2 ) × F 2 × dIF ⁄ dt Turn-off losses : P3 = VR × IRM 2 × × S × F 6 x dIF ⁄ dt Turn-off losses : with non negligible serial inductance P3’ = VR × IRM 2 × S × F 6 xdIF ⁄ dt + L × IRM 2 × F 2 P3, P3’ and P5 are suitable for power MOSFET and IGBT dI F /dt = VR /L dI /dt R tb ta I RM V R I V t S = tb/ta trr = ta + tb RECTIFIER OPERATION V I IL t TRANSISTOR dI /dt F dI /dt R tb ta I RM VR DIODE I V t trr = ta + tb S = tb / ta APPLICATION DATA (Cont’d) Fig. F : TURN-OFF CHARACTERISTICS. STTA312B 7/8 |
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