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IR1161LPBF Datasheet(PDF) 10 Page - International Rectifier |
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IR1161LPBF Datasheet(HTML) 10 Page - International Rectifier |
10 / 25 page IR1161LPBF 10 www.irf.com © 2015 International Rectifier Submit Datasheet Feedback June 1, 2015 Application Information and Additional Details State Diagram POWER ON Gate Inactive UVLO MODE VCC < VCC on ICC < ICC start Gate Inactive NORMAL Gate Active Gate PW ≥ MOT Cycle by Cycle MOT Check Enabled VCC > VCCon, & VDS>VTH3 VCC < VCCuvlo MOT PROTECTION MODE Gate Output Disabled VDS>VTH1 @ MOT VDS<VTH1 @ MOT UVLO Mode The IC remains in the under-voltage lockout condition until VCC exceeds the turn on threshold voltage, VCC ON. During the time the IC remains in the UVLO state, the gate drive circuit is inactive and only a very small quiescent current ICC START is consumed. UVLO mode is accessible from any other operating state whenever VCC < VCC UVLO. Normal Mode and Synchronized Enable Function The IC enters into normal operating mode once the UVLO voltage has been exceeded. When the IC enters the Normal Mode, the GATE output remains disabled (stays low) for a start-up delay time in the range of 100us, then VDS must transition above VTH3 two times to enable synchronous rectification. This ensures that the GATE output can never be enabled in the middle of a switching cycle. The first gate pulse after activation is blocked and the cycle by cycle MOT protection circuit is enabled. This logic avoids reverse currents through the SR MOSFET from occurring during startup. The gate will continuously drive the SR MOSFET after completing this startup sequence. MOT Protection Mode If the secondary current conduction time is shorter than the MOT (Minimum On Time), the following driver output pulse is disabled. This function can avoid reverse current from occurring when the system is switching at very low duty-cycles under very light or zero load conditions. System standby power consumption is reduced by disabling the GATE output. The cycle by cycle MOT check circuit is always activated under Normal Mode and MOT Protection Mode so that the IC will automatically resume normal operation only once the load increases to a level where the secondary current conduction time exceeds MOT. |
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