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IR1167ASPBF Datasheet(PDF) 8 Page - International Rectifier |
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IR1167ASPBF Datasheet(HTML) 8 Page - International Rectifier |
8 / 15 page IR1167AS/BS PRELIMINARY www.irf.com 8 IPRIM ISEC VSEC VPRIM time time T1 T2 T3 cycle of the SR MOSFET and, as a consequence, the max duty cycle of the primary side switch. DCM/CrCM Turn-off phase Once the SR MOSFET has been turned on, it will remain on until the rectified current will decay to the level where VDS will cross the turn-off threshold VTH1. This will happen differently depending on the mode of operation. In DCM the current will cross the threshold with a relatively low dI/dt. Once the threshold is crossed, the current will start flowing again through the body diode, causing the VDS voltage to jump negative. Depending on the amount of residual current, VDS may trigger once again the turn on threshold: for this reason VTH2 IPRIM ISEC VSEC VPRIM time time T1 T2 Primary and secondary currents and voltages for DCM mode Primary and secondary currents and voltages for CrCM mode is blanked for a certain amount of time (TBLANK) after V TH1 has been triggered. The blanking time is internally set. As soon as VDS crosses the positive threshold VTH3 also the blanking time is terminated and the IC is ready for next conduction cycle. CCM Turn-off phase In CCM mode the turn off transition is much steeper and dI/dt involved is much higher. The turn on phase is identical to DCM or CrCM and therefore wont be repeated here. During the SR FET conduction phase the current will decay linearly, and so will VDS on the SR FET. IPRIM ISEC VSEC VPRIM time time T1 T2 Primary and secondary currents and voltages for CCM mode Once the primary switch will start to turn back on, the SR FET current will rapidly decrease crossing VTH1 and turning the gate off. The turn off speed is critical to avoid cross conduction on the primary side and reduce switching losses. also in this case a blanking period will be applied, but given the very fast nature of this transition, it will be reset as soon as VDS crosses VTH3. |
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