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## TPS2074 Datasheet(PDF) 19 Page - Texas Instruments

 Part No. TPS2074 Description FOUR-PORT USB HUB POWER CONTROLLERS Download 27 Pages Scroll/Zoom 100% Manufacturer TI1 [Texas Instruments] Direct Link http://www.ti.com Logo

## TPS2074 Datasheet(HTML) 19 Page - Texas Instruments

 19 / 27 pageTPS2074, TPS2075FOUR-PORT USB HUB POWER CONTROLLERSSLVS288A – SEPTEMBER 2000 – REVISED FEBRUARY 200119POST OFFICE BOX 655303• DALLAS, TEXAS 75265APPLICATION INFORMATIONpower dissipation and junction temperatureThe major source of power dissipation for the TPS2074 and TPS2075 comes from the internal voltage regulatorand the N-channel MOSFETs. Checking the power dissipation and junction temperature is always a gooddesign practice. Begin by determining the rDS(on) of the N-channel MOSFET according to the input voltage andoperating temperature. As an initial estimate, use the highest operating ambient temperature of interest andread rDS(on) from the graphs shown under the typical characteristics section of this data sheet. Using this value,the power dissipation per switch can be calculated by:PD + rDS(on)I2Multiply this number by four to get the total power dissipation coming from the N-channel MOSFETs.The power dissipation for the internal voltage regulator is calculated using:PD + VI(BP)–VO(min)IO(OUT)The total power dissipation for the device becomes:PD(total) + PD(voltage regulator) )4PD(switch)Finally, calculate the junction temperature:TJ + PDRqJA ) TAWhere:TA = ambient temperature °CRθJA = Thermal resistance °C /W, equal to inverting of derating factor found on the power dissipationtable in this data sheet.Compare the calculated junction temperature with the initial estimate. If they do not agree within a few degrees,repeat the calculation, using the calculated value as the new estimate. Two or three iterations are generallysufficient to get a reasonable answer.thermal protectionThermal protection prevents damage to the IC when heavy-overload or short-circuit faults are present forextended periods. The faults force the TPS2074 and TPS2075 into constant-current mode at first, which causesthe voltage across the high-side switch to increase; under short-circuit conditions, the voltage across the switchis equal to the input voltage. The increased dissipation causes the junction temperature to rise to high levels.The protection circuit senses the junction temperature of the switch and shuts it off. Hysteresis is built into thethermal sense circuit, and after the device has cooled approximately 20 degrees the switch turns back on. Theswitch continues to cycle in this manner until the load fault or input power is removed.The TPS2074 and TPS2075 implement a dual thermal trip to allow fully independent operation of the powerdistribution switches. In an overcurrent or short-circuit condition the junction temperature rises. Once the dietemperature rises to approximately 140°C, the internal thermal-sense circuitry determines which power switchis in an overcurrent condition and turns only that power switch off, thus isolating the fault without interruptingoperation of the adjacent power switch. If the die temperature exceeds the first thermal trip point of 140°C andreaches 150°C, the device turns off. The OC output is asserted (active low) when overtemperature orovercurrent occurs.

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