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TPS40091 Fiches technique(PDF) 11 Page - Texas Instruments |
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TPS40091 Fiches technique(HTML) 11 Page - Texas Instruments |
11 / 24 page 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. |
Numéro de pièce similaire - TPS40091 |
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Description similaire - TPS40091 |
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