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TPS24771RGET Datasheet(PDF) 11 Page - Texas Instruments |
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TPS24771RGET Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 51 page  SET PLIM LIM SNS IMON 84375 R R R R P ´ = ´ ´ SNS,CL SET LIM,CL SNS SNS V 0.675 R I R R ´ = = SET SNS,CL IMON 0.675 R V R ´ = I LIM,CL I LIM,CL V DS V DS,MAX V SNS,PL V DS V DS,MAX I LIM,PL,MIN V SNS,CL V SNS,PL,MIN LIM LIM LIM,CL DS , P I MIN I V æ ö = ç ÷ è ø TPS24772 TPS24771 TPS24770 www.ti.com SLVSCZ3 – MARCH 2015 9.3 Feature Description 9.3.1 Enable and Over-voltage Protection The part is enabled when the ENHS pin voltage exceeds 1.35V and is disabled when the pin voltage falls under 1.3V providing 50mV of hysteresis. A resistor divider can be connected to these pins to turn on the TPS2477x at a certain bus voltage. The part will turn off if the OV pin exceeds 1.35V. 9.3.2 Current Limit and Power Limit during Start-up The current limit and power limit of the TPS2477x are programmable to protect the load, power supply, and the Hot Swap MOSFET. During start-up the active control loop will regulate the gate to ensure that the current through the MOSFET and the power dissipation of the MOSFET is below their respective pre-programmed thresholds. The maximum current allowed through the MOSFET (ILIM) is determined with the equation below. ILIM,CL is the programmed current limit, PLIM is the programmed power limit, and VDS is the drain to source voltage across the Hot Swap MOSFET. (1) This results in an IV curve shown in Figure 12. ILIM,PL denotes the maximum allowed MOSFET current (IDS) when the part is in power limit. As VDS increases, ILIM,PL decreases and ILIM,PL,MIN denotes the lowest ILIM,PL, which occurs at the largest VDS (VDS,MAX). The TPS2477x enforce this by regulating the voltage across RSNS (VSNS). VSNS,PL denotes VSNS when power limiting is active. Similarly to ILIM,PL, VSNS,PL decreases as VDS increases and VSNS,PL,MIN corresponds to the lowest VSNS,PL, which occurs at VDS,MAX. VSNS,CL is a current limiting sense voltage, which is programmable in the TPS2477x. Figure 12. Current vs VDS and VSNS vs VDS Programmed by Power Limit Engine. The current and power limit can be programmed using the equations below. sp (2) sp (3) sp (4) Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TPS24772 TPS24771 TPS24770 |
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