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TPS2070 Datasheet(PDF) 22 Page - Texas Instruments

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Part No. TPS2070
Description  FOUR-PORT USB HUB POWER CONTROLLERS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS2070 Datasheet(HTML) 22 Page - Texas Instruments

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TPS2070, TPS2071
FOUR-PORT USB HUB POWER CONTROLLERS
SLVS287A – SEPTEMBER 2000 – REVISED FEBRUARY 2001
22
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
power dissipation and junction temperature
The major source of power dissipation for the TPS2070 and TPS2071 comes from the internal voltage regulator
and the N-channel MOSFETs. Checking the power dissipation and junction temperature is always a good
design practice. Begin by determining the rDS(on) of the N-channel MOSFET according to the input voltage and
operating temperature. As an initial estimate, use the highest operating ambient temperature of interest and
read 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:
P
D + rDS(on)
I2
Multiply 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:
P
D + V
I(BP)
–V
O(min)
I
O(OUT)
The total power dissipation for the device becomes:
P
D(total) + P
D(voltage regulator) )
4
P
D(switch)
Finally, calculate the junction temperature:
T
J + PD
RqJA ) TA
Where:
TA = ambient temperature °C
RθJA = Thermal resistance °C/W, equal to inverting of derating factor found on the power dissipation
table 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 generally
sufficient to get a reasonable answer.


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