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ISL6551IBZ-T Datasheet(PDF) 9 Page - Intersil Corporation |
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ISL6551IBZ-T Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 26 page 9 FN9066.4 July 8, 2005 Shutdown Timing Diagrams Shutdown Timing Descriptions A (ON/OFF) - When the ON/OFF is pulled low, the soft-start capacitor is discharged and all the drivers are disabled. When the ON/OFF is released without a fault condition, a soft-start is initiated. B (OVERCURRENT) - If the output of the converter is over loaded, i.e., the PKILIM is above the bandgap reference voltage (BGREF), the soft-start capacitor is discharged very quickly and all the drivers are turned off. Thereafter, the soft- start capacitor is charged slowly, and discharged quickly if the output is overloaded again. The soft-start will remain in hiccup mode as long as the overload conditions persist. Once the overload is removed, the soft-start capacitor is charged up and the converter is then back to normal operation. C (LATCHING SHUTDOWN) - The IC is latched off completely as the LATSD pin is pulled high, and the soft-start capacitor is reset. D (ON/OFF) - The latch cannot be reset by the ON/OFF. E (LATCH RESET) - The latch is reset by removing the VDD. The soft-start capacitor starts to be charged after VDD increases above the turn-on threshold VDDON. F (VDD UVLO) - The IC is turned off when the VDD is below the turn-off threshold VDDOFF. Hysteresis VDDHYS is incorporated in the undervoltage lockout (UVLO) circuit. LATSD ON/OFF ILIM_OUT SOFT DRIVER SOFT-START PKILIM < BGREF PKILIM > BGREF SHUTDOWN FAULT FAULT OFF OVER CURRENT LATCHED OFF/ON LATCH UNDER VOLTAGE VDDON VDDOFF LATCH RESET BY VDD A B C D E F START ENABLE RESET LOCKOUT REMOVING VDD LATCH CANNOT BE RESET BY ON/OFF ISL6551 |
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