データシートサーチシステム
  Japanese  ▼
ALLDATASHEET.JP

X  

LM1085 データシート(PDF) 10 Page - Texas Instruments

Click here to check the latest version.
部品番号 LM1085
部品情報  The LM1085 is a series of low dropout positive voltage regulators with a maximum dropout of 1.5V at 3A of load current.
Download  22 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI - Texas Instruments

LM1085 データシート(HTML) 10 Page - Texas Instruments

Back Button LM1085 Datasheet HTML 6Page - Texas Instruments LM1085 Datasheet HTML 7Page - Texas Instruments LM1085 Datasheet HTML 8Page - Texas Instruments LM1085 Datasheet HTML 9Page - Texas Instruments LM1085 Datasheet HTML 10Page - Texas Instruments LM1085 Datasheet HTML 11Page - Texas Instruments LM1085 Datasheet HTML 12Page - Texas Instruments LM1085 Datasheet HTML 13Page - Texas Instruments LM1085 Datasheet HTML 14Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 22 page
background image
LM1085
SNVS038G – JULY 1999 – REVISED MARCH 2013
www.ti.com
THERMAL CONSIDERATIONS FOR THE TO-220 PACKAGE
ICs heats up when in operation, and power consumption is one factor in how hot it gets. The other factor is how
well the heat is dissipated. Heat dissipation is predictable by knowing the thermal resistance between the IC and
ambient (
θJA). Thermal resistance has units of temperature per power (°C/W). The higher the thermal resistance,
the hotter the IC.
The LM1085 specifies the thermal resistance for the TO-220 package as Junction to Case (
θJC). In order to get
the total resistance to ambient (
θJA), two other thermal resistances must be added, one for case to heat-sink
(
θCH) and one for heatsink to ambient (θHA). The junction temperature can be predicted as follows:
TJ = TA + (PD x (θJC + θCH + θHA))
(1)
TJ = TA + (PD x θJA)
(2)
where TJ is junction temperature, TA is ambient temperature, and PD is the power dissipation of the device.
Device power dissipation is calculated as follows:
PD = OUTPUT Section Dissipation + CONTROL Section Dissipation
(3)
PD = ( (VIN - VOUT) x ILOAD) + ( (VIN - VOUT) x IGND)
(4)
Figure 20 shows the voltages and currents which are present in the circuit.
Figure 20. Power Dissipation Diagram
Once the devices power is determined, the maximum allowable (
θJA(max)) is calculated as:
θJA(MAX) = TR(MAX) / PD
(5)
θJA(MAX)= TJ(MAX) - TA(MAX)) / PD
(6)
The required heat sink is determined by calculating its required thermal resistance (
θHA(MAX)).
θHA(MAX) = θJA(MAX) − (θJC + θCH)
(7)
If thermal compound is used,
θCH can be estimated at 0.2 C/W. If the case is soldered to the heat sink, then a
θCH can be estimated as 0 C/W.
If PC board copper is going to be used as a heat sink, then Figure 21 can be used to determine the appropriate
area (size) of copper foil required.
10
Submit Documentation Feedback
Copyright © 1999–2013, Texas Instruments Incorporated
Product Folder Links: LM1085


同様の部品番号 - LM1085

メーカー部品番号データシート部品情報
logo
National Semiconductor ...
LM1085 NSC-LM1085 Datasheet
744Kb / 13P
   3A Low Dropout Positive Regulators
logo
HTC Korea TAEJIN Techno...
LM1085 HTC-LM1085 Datasheet
311Kb / 8P
   3A L.D.O. VOLTAGE REGULATOR (Adjustable & Fixed)
logo
List of Unclassifed Man...
LM1085 ETC2-LM1085 Datasheet
85Kb / 2P
   3A L.D.O. VOLTAGE REGULATOR (Adjustable & Fixed)
logo
Texas Instruments
LM1085 TI1-LM1085 Datasheet
2Mb / 29P
[Old version datasheet]   3-A Low Dropout Positive Regulators
logo
Seme LAB
LM1085-05-220M SEME-LAB-LM1085-05-220M Datasheet
35Kb / 3P
   LOW DROPOUT 3 AMP POSITIVE
More results

同様の説明 - LM1085

メーカー部品番号データシート部品情報
logo
Texas Instruments
LM1117-N TI-LM1117-N Datasheet
2Mb / 32P
[Old version datasheet]   The LM1117-N is a series of low dropout voltage regulators with a dropout of 1.2V at 800mA of load current.
logo
Shenzhen Huazhimei Semi...
AMS1117B HMSEMI-AMS1117B Datasheet
947Kb / 9P
   series of low dropout three-terminal regulators with a dropout of 1.3V at 1A load current
logo
Texas Instruments
LM1085IT-5.0 TI1-LM1085IT-5.0 Datasheet
2Mb / 22P
[Old version datasheet]   LM1085 3A Low Dropout Positive Regulators
logo
International Rectifier
OM7764ASM IRF-OM7764ASM_15 Datasheet
181Kb / 5P
   Dropout Voltage of 400mV at Full Load
OM7764ASC IRF-OM7764ASC_15 Datasheet
168Kb / 5P
   Dropout Voltage of 400mV at Full Load
logo
GTM CORPORATION
GL1147 GTM-GL1147 Datasheet
222Kb / 3P
   a low dropout at positive fixed-mode regulator with minimum of 1A output current capability.
logo
Advanced Power Electron...
APE8800 A-POWER-APE8800_14 Datasheet
126Kb / 8P
   Low Dropout Voltage of 250mV at 300mA
APE8800A A-POWER-APE8800A_14 Datasheet
158Kb / 7P
   Low Dropout Voltage of 250mV at 300mA
APE8805 A-POWER-APE8805_14 Datasheet
398Kb / 10P
   Low Dropout Voltage of 600mV at 600mA
logo
Microsemi Corporation
LX8587-XX MICROSEMI-LX8587-XX Datasheet
211Kb / 8P
   3A LOW DROPOUT POSITIVE REGULATORS
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22


データシート ダウンロード

Go To PDF Page


リンク URL




プライバシーポリシー
ALLDATASHEET.JP
ALLDATASHEETはお客様のビジネスに役立ちますか?  [ DONATE ] 

Alldatasheetは   |   広告   |   お問い合わせ   |   プライバシーポリシー   |   リンク交換   |   メーカーリスト
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
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