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TPS40090PWG4 Datasheet(PDF) 10 Page - Texas Instruments |
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TPS40090PWG4 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 31 page t SS + 0.7 C SS 5 10*6 t PG + 1.43 T SS V OUT + 0.7 V R1 R2 ) 1 TPS40090 TPS40091 SLUS578B – OCTOBER 2003 – REVISED MAY 2006 www.ti.com When the BP5 pin voltage crosses its lower undervoltage threshold and the power-on reset function is cleared, the calibrated current source starts charging the soft start capacitor. The PGOOD pin is held low during the start up. The rising voltage across the capacitor serves as a reference for the error amplifier assuring start-up in a closed loop manner. When the soft start pin voltage reaches the level of the reference voltage VREF = 0.7 V, the converter's output reaches the regulation point and further rise of the soft start voltage has no effect on the output. (2) When the soft-start voltage reaches level of 1 V, the power good (PGOOD) function is cleared and reported on the PGOOD pin. Normally, the PGOOD pin goes high at this moment. The time from when SS begins to rise to when PGOOD is reported is: (3) OUTPUT VOLTAGE PROGRAMMING The converter output voltage is programmed by the R1/R2 divider from the output of the differential amplifier. The center point of the divider is connected to the inverting output of the error amplifier (FB), as shown in Figure 5. (4) CURRENT SENSE FAULT PROTECTION Multiphase controllers with forced current sharing are inherently sensitive to failure of a current sense component. In the event of such failure, the whole load current can be steered with catastrophic consequences into a single channel where the fault has happened. The dedicated circuit in the TPS4009x controller prevents it from starting up if any current sense pin is open or shorted to ground. The current-sense fault detection circuit is active only during device initialization, and it does not provide protection should a current-sense failure happen during normal operation. OVERVOLTAGE PROTECTION If the voltage at the FB pin (VFB) exceeds VREF by more than 16%, the TPS4009x enters into an overvoltage state. In this condition, the output signals from the controller to the external drivers is pulled low, causing the drivers to force all of the upper MOSFETs to the OFF position and all the lower MOSFETs to the ON position. As soon as VFB returns to regulation, the normal operating state resumes. 10 Submit Documentation Feedback Copyright © 2003–2006, Texas Instruments Incorporated Product Folder Link(s): TPS40090 TPS40091 |
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