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TPS40091PWG4 Datasheet(PDF) 11 Page - Texas Instruments |
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TPS40091PWG4 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 31 page V ILIM + 2.7 I PH(max) R CS I PH(max) + IOUT ) V IN * VOUT V OUT 2 L f SW V IN TPS40090 TPS40091 www.ti.com SLUS578B – OCTOBER 2003 – REVISED MAY 2006 OVERCURRENT PROTECTION The overcurrent function monitors the voltage level separately on each current sense input and compares it to the voltage on the ILIM pin set by a divider from the controller's reference. In case a threshold of V(ILIM)/2.7 is exceeded the PWM cycle on the associated phase is terminated. The voltage level on the ILIM pin is determined by the following expression: (5) where: • IPH(max) is a maximum value of the phase current allowed • RCS is a value of the current sense resistor used (6) 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 now serves 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. 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 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. Copyright © 2003–2006, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): TPS40090 TPS40091 |
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