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TPS40091 Fiches technique(PDF) 11 Page - Texas Instruments

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No de pièce TPS40091
Description  HIGH FREQUENCY MULTIPHASE CONTROLLER
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

TPS40091 Fiches technique(HTML) 11 Page - Texas Instruments

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TPS40090
TPS40091
SLUS578A − OCTOBER 2003 − REVISED JUNE 2004
11
www.ti.com
APPLICATION INFORMATION
If the overcurrent condition continues, each phase’s PWM cycle is terminated by the overcurrent signals. This
puts a converter in a constant current mode with the output current programmed by the ILIM voltage. Eventually
the supply and demand equilibrium on the converter output fails and the output voltage declines. When the
undervoltage threshold is reached, the converter enters a hiccup mode. The controller is stopped and the output
is not regulated any more, the softstart pin function changes. It serves now as a timing capacitor for a fault control
circuit. The soft-start pin is periodically charged and discharged by the fault control circuit. After seven hiccup
cycles expire, the controller attempts to restore normal operation. If the overload condition is not cleared, the
controller stays in the hiccup mode indefinitely long. In such conditions the average current delivered to the load
is roughly 1/8 of the set overcurrent value.
UNDERVOLTAGE PROTECTION
If the FB pin voltage falls lower than the undervoltage protection threshold (84.5%), the controller enters the
hiccup mode as it is described in the Overcurrent Protection section.
FAULT-FREE OPERATION
If the SS pin voltage is externally prevented from rising above the 1-V threshold, the controller does not execute
nor report most faults and the PGOOD output remains low. Only the overcurrent function and current-sense fault
remain active. The overcurrent protection continues to terminate PWM cycle every time when the threshold is
exceeded but the hiccup mode is not entered.


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