- 您現在的位置：買賣IC網 > PDF目錄98280 > TPS2561DRCT (TEXAS INSTRUMENTS INC) 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 PDF資料下載
參數資料
| 型號： | TPS2561DRCT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封裝： | GREEN, SON-10 |
| 文件頁數： | 7/24頁 |
| 文件大小： | 942K |
| 代理商： | TPS2561DRCT |
www.ti.com
SLVS930 – DECEMBER 2009
POWER DISSIPATION AND JUNCTION TEMPERATURE
The low on-resistance of the N-channel MOSFET allows small surface-mount packages to pass large currents. It
is good design practice to estimate power dissipation and junction temperature. The below analysis gives an
approximation for calculating junction temperature based on the power dissipation in the package. However, it is
important to note that thermal analysis is strongly dependent on additional system level factors. Such factors
include air flow, board layout, copper thickness and surface area, and proximity to other devices dissipating
power. Good thermal design practice must include all system level factors in addition to individual component
analysis.
Begin by determining the rDS(on) of the N-channel MOSFET relative 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 typical characteristics graph. Using this value, the power dissipation can be calculated by:
PD = (RDS(on) × IOUT1
2) +(R
DS(on) × IOUT2
2)
Where:
PD = Total power dissipation (W)
rDS(on) = Power switch on-resistance of one channel ()
IOUTx = Maximum current-limit threshold set by RILIM(A)
This step calculates the total power dissipation of the N-channel MOSFET.
Finally, calculate the junction temperature:
TJ = PD × θJA + TA
Where:
TA = Ambient temperature (°C)
θJA = Thermal resistance (°C/W)
PD = Total power dissipation (W)
Compare the calculated junction temperature with the initial estimate. If they are not within a few degrees, repeat
the calculation using the "refined" rDS(on) from the previous calculation as the new estimate. Two or three
iterations are generally sufficient to achieve the desired result. The final junction temperature is highly dependent
on thermal resistance
θJA, and thermal resistance is highly dependent on the individual package and board
layout. The Dissipating Rating Table provides example thermal resistances for specific packages and board
layouts.
Copyright 2009, Texas Instruments Incorporated
15
相關PDF資料 |
PDF描述 |
|---|---|
| TPS3305-20QDRQ1 | 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| TPS3305-18QDRQ1 | 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| TPS3306-20DRG4 | 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| TPS3306-20DGKRG4 | 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| TPS3307-18QDRG4Q1 | 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS2561QDRCRQ1 | 功能描述:電源開關 IC - USB AC Dual Channel Prec Adj Crnt-Ltd Pwr Sw RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| TPS25740AEVM-741 | 功能描述:LM5175, TPS25740A - Interface, USB Type-C? Evaluation Board 制造商:texas instruments 系列:- 零件狀態:新產品 主要用途:接口，USB Type-C? 嵌入式:- 使用的 IC/零件:LM5175, TPS25740A 主要屬性:- 輔助屬性:- 所含物品:板 標準包裝:1 |
| TPS25740ARGET | 功能描述:USB, Type-C Controller PMIC 24-VQFN (4x4) 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態:新產品 應用:USB，Type-C 控制器 電流 - 電源:- 電壓 - 電源:4.65 V ~ 25 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應商器件封裝:24-VQFN（4x4） 標準包裝:1 |
| TPS25740BRGET | 功能描述:USB TYPE-C AND USB PD SOURCE CO 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態:在售 應用:USB，Type-C 控制器 電流 - 電源:- 電壓 - 電源:4.65 V ~ 25 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應商器件封裝:24-VQFN（4x4） 標準包裝:1 |
| TPS25740EVM-741 | 功能描述:LM5175, TPS25740 - Interface, USB Type-C? Evaluation Board 制造商:texas instruments 系列:- 零件狀態:新產品 主要用途:接口，USB Type-C? 嵌入式:- 使用的 IC/零件:LM5175, TPS25740 主要屬性:- 輔助屬性:- 所含物品:板 標準包裝:1 |
發布緊急采購，3分鐘左右您將得到回復。