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SMH4811AG Datasheet(PDF) 7 Page - Summit Microelectronics, Inc. |
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SMH4811AG Datasheet(HTML) 7 Page - Summit Microelectronics, Inc. |
7 / 16 page 7 2044 6.1 2/8/01 SMH4811A SUMMIT MICROELECTRONICS, Inc. Preliminary Under-/Over-Voltage Filtering The SMH4811A may also be configured so that an out of tolerance condition on UV/OV will not shut off the output immediately. Instead, a filter delay may be inserted so that only sustained under-voltage or over-voltage conditions will shut off the output. When the UV/OV filter option is enabled an out of tolerance condition on UV or OV for longer than the filter delay time, tUOFLTR, activates the FAULT# output, and the VGATE and PG outputs will be latched in the off state. To initiate another power-up sequence the FAULT# output must first be reset. Refer to the appropriate section on resetting the FAULT# output. The Under-/Over-Voltage Filtering feature is disabled in the default configuration of the device. Under-Voltage Hysteresis The Under-Voltage comparator input may be configured with a programmable level of hysteresis. The compare level may be set in steps (up to 15) of 62.5mV below 2.5V. The default under-voltage hysteresis level is set to 62.5mV. Soft Start Slew Rate Control Once all of the preconditions for powering up the DC/DC controller have been met, the SMH4811A provides a means to soft start the external power FET. It is important to limit in-rush current to prevent damage to the add-in card or disruptions to the host power supply. For example, Figure 2. Complete Power On Timing Sequence VDD 2044 Fig02 5.0 UV OV PD1# + PD2# VGATE DRAIN SENSE 2.5VREF 2.5VREF 11 ≤ VDD ≤ 13 tPDD PG# <tPUVF 50mVREF <tCBD ENPG CBSENSE 5V VDD VDD – VGT |
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