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參數(shù)資料
| 型號： | A1323LLHLT-T |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | Ratiometric Linear Hall Effect Sensor for High-Temperature Operation |
| 中文描述： | 比例式線性霍爾效應(yīng)傳感器的高高溫作業(yè) |
| 文件頁數(shù)： | 9/11頁 |
| 文件大?。?/td> | 328K |
| 代理商： | A1323LLHLT-T |
Ratiometric Linear Hall Effect Sensor
for High-Temperature Operation
A1321, A1322,
and
A1323
9
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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
fi
gure 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 signi
fi
cant 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)
Δ
T = P
D
×
R
θ
JA
(2)
T
J
= T
A
+
Δ
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
Δ
T = P
D
×
R
θ
JA
= 48 mW
×
140 °C/W = 7°C
T
J
= T
A
+
Δ
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, speci
fi
cally:
R
θ
JA
=
165°C/W, T
J(max)
=
165°C, V
CC(max)
=
5.5 V, and
I
CC(max)
=
8
mA.
Calculate the maximum allowable power level, P
D(max)
. First,
invert equation 3:
Δ
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)
=
Δ
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 ÷ 8 mA = 11.4 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.
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| A1321LUA | Ratiometric Linear Hall Effect Sensor for High-Temperature Operation |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| A1323LLHLT-T | 制造商:Allegro MicroSystems 功能描述:Hall Effect Switch IC |
| A1323LLHLT-T2 | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:Ratiometric Linear Hall Effect Sensor ICs for High-Temperature Operation |
| A1323LUA | 功能描述:IC SENSOR HALL EFFECT 3-SIP RoHS:否 類別:傳感器，轉(zhuǎn)換器 >> 磁性 - 霍爾效應(yīng)，數(shù)字式開關(guān)，線性，羅盤 (IC) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 傳感范圍:20mT ~ 80mT 類型:旋轉(zhuǎn) 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(diǎn):可編程 工作溫度:-40°C ~ 150°C 封裝/外殼:20-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:20-SSOP 包裝:Digi-Reel® 其它名稱:AS5132-HSST-500DKR |
| A1323LUA-LCT | 制造商:Allegro MicroSystems LLC 功能描述: |
| A1323LUA-T | 功能描述:IC SENSOR HALL EFFECT 3-SIP RoHS:是 類別:傳感器，轉(zhuǎn)換器 >> 磁性 - 霍爾效應(yīng)，數(shù)字式開關(guān)，線性，羅盤 (IC) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 傳感范圍:20mT ~ 80mT 類型:旋轉(zhuǎn) 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(diǎn):可編程 工作溫度:-40°C ~ 150°C 封裝/外殼:20-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:20-SSOP 包裝:Digi-Reel® 其它名稱:AS5132-HSST-500DKR |
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