- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄375096 > A1102LLHLT-T (Allegro MicroSystems, Inc.) Continuous-Time Switch Family PDF資料下載
參數(shù)資料
| 型號： | A1102LLHLT-T |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | Continuous-Time Switch Family |
| 中文描述： | 連續(xù)時間開關系列 |
| 文件頁數(shù)： | 9/11頁 |
| 文件大小： | 428K |
| 代理商： | A1102LLHLT-T |
9
A1101-DS
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Continuous-Time Switch Family
A1101, A1102, A1103, A1104, and A1106
Power Derating
Power Derating
The device must be operated below the maximum junction
temperature of the device, T
J(max)
. Under certain combinations of
peak conditions, reliable operation may require derating sup-
plied power or improving the heat dissipation properties of the
application. This section presents a procedure for correlating
factors affecting operating T
J
. (Thermal data is also available on
the Allegro MicroSystems Web site.)
The Package Thermal Resistance, R
θ
JA
, is a figure of merit sum-
marizing the ability of the application and the device to dissipate
heat from the junction (die), through all paths to the ambient air.
Its primary component is the Effective Thermal Conductivity,
K, of the printed circuit board, including adjacent devices and
traces. Radiation from the die through the device case, R
θ
JC
, is
relatively small component of R
θ
JA
. Ambient air temperature,
T
A
, and air motion are significant external factors, damped by
overmolding.
The effect of varying power levels (Power Dissipation, P
D
), can
be estimated. The following formulas represent the fundamental
relationships used to estimate T
J
, at P
D
.
P
D
= V
IN
×
I
IN
(1)
T = P
D
×
R
θ
JA
(2)
T
J
= T
A
+
T
(3)
For example, given common conditions such as: T
A
= 25°C,
V
CC
= 12 V, I
CC
= 4 mA, and R
θ
JA
= 140 °C/W, then:
P
D
= V
CC
×
I
CC
= 12 V
×
4 mA = 48 mW
T = P
D
×
R
θ
JA
= 48 mW
×
140 °C/W = 7°C
T
J
= T
A
+
T = 25°C + 7°C = 32°C
A worst-case estimate, P
D(max)
, represents the maximum allow-
able power level (V
CC(max)
, I
CC(max)
), without exceeding T
J(max)
,
at a selected R
θ
JA
and T
A
.
Example
: Reliability for V
CC
at T
A
=
150°C, package UA, using
minimum-K PCB.
Observe the worst-case ratings for the device, specifically:
R
θ
JA
=
165°C/W, T
J(max)
=
165°C, V
CC(max)
=
24 V, and
I
CC(max)
=
7.5
mA.
Calculate the maximum allowable power level, P
D(max)
. First,
invert equation 3:
T
max
= T
J(max)
– T
A
= 165
°C
–
150
°C = 15
°C
This provides the allowable increase to T
J
resulting from internal
power dissipation. Then, invert equation 2:
P
D(max)
=
T
max
÷ R
θ
JA
= 15°C ÷ 165 °C/W = 91 mW
Finally, invert equation 1 with respect to voltage:
V
CC(est)
= P
D(max)
÷ I
CC(max)
= 91 mW ÷ 7.5 mA = 12.1 V
The result indicates that, at T
A
, the application and device can
dissipate adequate amounts of heat at voltages
≤
V
CC(est)
.
Compare V
CC(est)
to V
CC(max)
. If V
CC(est)
≤
V
CC(max)
, then reli-
able operation between V
CC(est)
and V
CC(max)
requires enhanced
R
θ
JA
. If V
CC(est)
≥
V
CC(max)
, then operation between V
CC(est)
and
V
CC(max)
is reliable under these conditions.
相關PDF資料 |
PDF描述 |
|---|---|
| A1103 | KPT 2C 2#20 PIN RECP |
| A1103EUA-T | Continuous-Time Switch Family |
| A1103LLHLT-T | Continuous-Time Switch Family |
| A1104 | Continuous-Time Switch Family |
| A1104EUA-T | Continuous-Time Switch Family |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| A1102LLHLX-T | 功能描述:IC HALL EFFECT SWITCH SOT23W 制造商:allegro microsystems, llc 系列:- 包裝:帶卷（TR） 零件狀態(tài):有效 功能:單極開關 技術:霍爾效應 極化:南極 感應范圍:24.5mT 跳閘，6mT 釋放 測試條件:-40°C ~ 150°C 電壓 - 電源:3.8 V ~ 24 V 電流 - 電源（最大值）:7.5mA 電流 - 輸出（最大值）:25mA 輸出類型:開路漏極 特性:- 工作溫度:-40°C ~ 150°C（TA） 封裝/外殼:SOT-23W 供應商器件封裝:SOT-23W 標準包裝:10,000 |
| A1102LUA-T | 功能描述:IC SWITCH HALL EFFECT 3-SIP RoHS:是 類別:傳感器，轉換器 >> 磁性 - 霍爾效應，數(shù)字式開關，線性，羅盤 (IC) 系列:- 標準包裝:1 系列:- 傳感范圍:20mT ~ 80mT 類型:旋轉 電源電壓:4.5 V ~ 5.5 V 電流 - 電源:15mA 電流 - 輸出（最大）:- 輸出類型:數(shù)字式，PWM，8.5 位串行 特點:可編程 工作溫度:-40°C ~ 150°C 封裝/外殼:20-SSOP（0.209"，5.30mm 寬） 供應商設備封裝:20-SSOP 包裝:Digi-Reel® 其它名稱:AS5132-HSST-500DKR |
| A1102LUA-T-RENISHAW | 制造商:Allegro MicroSystems LLC 功能描述: |
| A1102RW | 制造商:MPD 制造商全稱:MicroPower Direct, LLC 功能描述:Miniature, 10W DIP Single & Dual Output DC/DC Converters |
| A1103 | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:Continuous-Time Switch Family |
發(fā)布緊急采購，3分鐘左右您將得到回復。