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參數(shù)資料
| 型號： | A1425LK |
| 廠商： | Allegro Microsystems Inc |
| 文件頁數(shù)： | 12/13頁 |
| 文件大?。?/td> | 404K |
| 描述： | IC SENSOR HALL EFFECT AC 4-SIP |
| 標準包裝： | 500 |
| 傳感范圍： | 11G 跳閘，-11G 釋放 |
| 類型： | 專用型 |
| 電源電壓： | 4 V ~ 26.5 V |
| 電流 - 電源： | 7mA |
| 電流 - 輸出（最大）： | 25mA |
| 輸出類型： | 數(shù)字，開路集電極 |
| 特點： | 高精度 |
| 工作溫度： | -40°C ~ 150°C |
| 封裝/外殼： | 4-SIP |
| 供應商設備封裝： | 4-SIP |
| 包裝： | 散裝 |
High Accuracy Analog Speed Sensor IC with Integrated
Filter Capacitor and Dual Zero-Crossing Output Signal
A1425
12
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Power Derating
The device must be operated below the maximum junction
temperature of the device, T
J
(max). Under certain combina-
tions of peak conditions, reliable operation may require derating
supplied 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
qJA
, is a 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
qJC
, is
relatively small component of R
qJA
. Ambient air temperature,
T
A
, and air motion are signi 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
?/DIV>
I
IN
(1)
DT = P
D
?/DIV>
R
qJA
(2)
T
J
= T
A
+ 擳 (3)
For example, given common conditions such as: T
A
= 25癈,
V
CC
= 5.0 V, I
CC
= 4.2 mA, and R
qJA
= 177 癈/W, then:
P
D
= V
CC
?/DIV>
I
CC
= 5.0 V
?/DIV>
4.2 mA = 21.0 mW
DT = P
D
?/DIV>
R
qJA
= 21.0 mW
?/DIV>
177 癈/W = 3.7癈
T
J
= T
A
+ DT = 25癈 + 3.7癈 = 28.7癈
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
qJA
and T
A
.
Example
Reliability for V
CC
at T
A
=
150癈, using minimum-K PCB
Observe the worst-case ratings for the device, speci cally:
R
qJA
=
177癈/W, T
J
(max)
=
165癈, V
CC
(max)
=
26.5
V, and
I
CC
(max)
=
7.0
mA.
Calculate the maximum allowable power level, P
D
(max). First,
invert equation 3:
DT
max
= T
J
(max) T
A
= 165
癈
150
癈 = 15
癈
This provides the allowable increase to T
J
resulting from internal
power dissipation. Then, invert equation 2:
P
D
(max)
= DT
max
?R
qJA
= 15癈 ?177 癈/W = 84 mW
Finally, invert equation 1 with respect to voltage:
V
CC(est)
= P
D
(max)
? I
CC
(max) = 84 mW ?7.0 mA = 12 V
The result indicates that, at T
A
, the application and device can
dissipate adequate amounts of heat at voltages dV
CC(est)
.
Compare V
CC(est)
to V
CC
(max). If V
CC(est)
d V
CC
(max), then reli-
able operation between V
CC(est)
and V
CC
(max) requires enhanced
R
qJA
. If V
CC(est)
e V
CC
(max), then operation between V
CC(est)
and V
CC
(max) is reliable under these conditions.
For example, when a standard diode with a 0.7 V drop is used:
V
S
(max) = 12 V + 0.7 V = 12.7 V
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| A1425LK-T | 功能描述:IC SENSOR HALL EFFECT AC 4-SIP RoHS:是 類別:傳感器，轉(zhuǎn)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(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: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 |
| A1425-PQ160C | 制造商:Microsemi SOC Products Group 功能描述: |
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| A1428AG2 | 制造商:DBLECTRO 制造商全稱:DB Lectro Inc 功能描述:DIP PLUG PITCH:2.54mm |
| A1428AS1 | 制造商:DBLECTRO 制造商全稱:DB Lectro Inc 功能描述:DIP PLUG PITCH:2.54mm |
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