 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
TPS2070 Datasheet(PDF) 22 Page - Texas Instruments |
|
|
||||||||||||||||||||||||||||||
TPS2070 Datasheet(HTML) 22 Page - Texas Instruments |
|
|
22 / 29 page  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. |
Similar Part No. - TPS2070 |
|
Similar Description - TPS2070 |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
allmanual.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
