參數(shù)資料
型號(hào): TPS2070DAP
廠商: Texas Instruments, Inc.
英文描述: FOUR-PORT USB HUB POWER CONTROLLERS
中文描述: 4端口USB集線器電源控制器
文件頁(yè)數(shù): 22/29頁(yè)
文件大?。?/td> 472K
代理商: TPS2070DAP
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 r
DS(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 r
DS(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
r
DS(on)
I
2
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
VI(BP)
VO(min)
IO(OUT)
The total power dissipation for the device becomes:
P
D(total)
PD(voltage regulator)
4
PD(switch)
Finally, calculate the junction temperature:
T
J
P
D
R
JA
T
A
Where:
T
A
= ambient temperature
°
C
R
θ
JA
= 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.
相關(guān)PDF資料
PDF描述
TPS2070DAPR FOUR-PORT USB HUB POWER CONTROLLERS
TPS62000SHKK 1.6 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, CDFP10
TPS65137ADSCR SWITCHING REGULATOR, PDSO10
TRSP6659EK1-1.8 1.5MHz, 600mA Synchronous Buck Regulator
TS1117ICP-1.8 5.0 AMP POSITIVE VOLTAGE REGULATOR
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS2070DAP 制造商:Texas Instruments 功能描述:Controller IC
TPS2070DAPG4 功能描述:熱插拔功率分布 Pwr Controller for Bus/Self Pwrd Hub RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
TPS2071DAP 功能描述:熱插拔功率分布 Pwr Cntrlr for Bus/ 4-Port USB Hub RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
TPS2071DAP 制造商:Texas Instruments 功能描述:IC PCMCIA PWR I/F SW 32-HTSSOP 制造商:Texas Instruments 功能描述:IC, PCMCIA PWR I/F SW 32-HTSSOP
TPS2071DAPG4 功能描述:熱插拔功率分布 Pwr Cntrlr for Bus/ 4-Port USB Hub RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube