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AUIRS1170S Scheda tecnica(PDF) 12 Page - Infineon Technologies AG |
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AUIRS1170S Scheda tecnica(HTML) 12 Page - Infineon Technologies AG |
12 / 28 page AUIRS1170S 12 Rev. 2.3 2016-09-03 MOT Protection Mode If the secondary current conduction time is shorter than the MOT (Minimum On Time) setting, the next driver output is disabled. This function can avoid reverse current that occurs when the system works at very low duty- cycles or at very light/no load conditions and reduce system standby power consumption by disabling GATE outputs. The Cycle by Cycle MOT Check circuit is always activated under Normal Mode and MOT Protection Mode, so that the IC can automatically resume normal operation once the load increases to a level and the secondary current conduction time is longer than MOT. VG pulse can result shorter than MOT in case the sensed VDS voltage crosses both VTH1 and VTH3 before MOT time is expired. In particular, VG signal is VTH3 dominant and it is reset when VDS crosses VTH3. Despite the pulse length may result shorter, the MOT functionality is preserved and AUIRS1170S filters the following VDS pulse out by keeping VG low. Figure M1 shows the behavior of AUIRS1170S at VG pin in this specific case (continuous line) and in case VDS does not cross VTH3 before MOT is expired (dotted line).TP represents the VDS pulse length, TA defines the time at which VDS crosses VTH3, TB is the intrinsic delay of VTH3 reset circuit and TG is the VG pulse length. TB has been designed in order to filter out possible VDS noises due to switching of the driven switch and it is in the order of 400ns. Vth1 Vth3 Vth2 TA TB Tp TG VG VDS MOT Figure M1: VG length as function of VDS in case it crosses VTH3 either before (continuous line) or after (dotted line) MOT expires. |
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