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TPS2343 Datasheet(PDF) 18 Page - Texas Instruments |
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TPS2343 Datasheet(HTML) 18 Page - Texas Instruments |
18 / 39 page TPS2343 SLUS644B − FEBRUARY 2005 − MAY 2005 18 www.ti.com APPLICATION INFORMATION 3VAUX Supply Control The TPS2343 3VAUX supply is completely independent of the main supply. Supply status and faults on main supplies have no effect on 3VAUX and faults on 3VAUX have no effect on main supply operation. The TPS2343 uses internal power MOSFETs for the 3VAUX supply and voltage multiplying charge pumps to drive the gates of the power MOSFETs to 8 V. Inrush current for the 3VAUX supply is controlled because the slew rate of the 3VAUX supply is limited. This slew rate is set by the capacitor from 3VAUXGx to AGND. Slew rate can be estimated as: dV dt + I GATE C 3VAUXGx where C3VAUXGx is the capacitor from 3VAUXGx to AGND and IGATE is the 3VAUXG gate charge current. Inrush current caused by this slewing and any adapter card load capacitance can be estimated as: PCI specifications allow for 3.3VAUX supply adapter card bulk capacitance of up to 150 µF. This load capacitance causes additional inrush current of: I INRUSH + CLOAD dV dt + C LOAD 5 mA C 3VAUXGx Using the recommended value for C3VAUXGx = 0.022 µF and the typical value for IGATE = 5 µA, average inrush current can be estamated as: I RUSH + 150 mF 5 mA 0.022 mF + 0.034 A The 3VAUXx current-sense threshold is internally set and can not be adjusted. When main power is applied to the TPS2343, all gates are actively held low. When main power is removed, leakage current can potentially raise gate voltage, but because main power is not applied, no malfunction occurs. This is noted here as floating gates may be observed during bench testing, but ths is not an application problem. |
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