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参数资料
| 型号： | A3250ELTTR |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 14/16页 |
| 文件大小： | 300K |
| 描述： | IC SW HALL EFFECT UNI SOT-89 |
| 标准包装： | 1,000 |
| 传感范围： | 50G |
| 类型： | 单极开关 |
| 电源电压： | 4.2 V ~ 24 V |
| 电流 - 电源： | 10mA |
| 电流 - 输出（最大）： | 20mA |
| 输出类型： | 数字，开路集电极 |
| 特点： | 稳压电压 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | TO-243AA |
| 供应商设备封装： | SOT-89-3 |
| 包装： | 带卷 (TR) |
Field-Programmable, Chopper-Stabilized,
Unipolar Hall-Effect Switches
A3250 and
A3251
13
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
qJA
, 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
qJC
, is
relatively small component of R
qJA
. 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
?/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
= 12 V, I
CC
= 4 mA, and R
qJA
= 165 癈/W, then:
P
D
= V
CC
?/DIV>
I
CC
= 12 V
?/DIV>
4 mA = 48 mW
DT = P
D
?/DIV>
R
qJA
= 48 mW
?/DIV>
165 癈/W = 8癈
T
J
= T
A
+ DT = 25癈 + 8癈 = 33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, package UA, using
minimum-K PCB.
Observe the worst-case ratings for the device, specifically:
R
qJA
=
165癈/W, T
J(max)
=
165癈, V
CC(max)
=
24 V, and
I
CC(max)
=
10
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 ?165 癈/W = 91 mW
Finally, invert equation 1 with respect to voltage:
V
CC(est)
= P
D(max)
? I
CC(max)
= 91 mW ?10 mA = 9 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.
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相关代理商/技术参数 |
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| A3250ELTTR-T | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Field-Programmable, Chopper-Stabilized Unipolar Hall-Effect Switches |
| A3250EUA | 功能描述:IC SW HALL EFFECT UNI 3-SIP RoHS:否 类别:传感器，转换器 >> 磁性 - 霍尔效应，数字式开关，线性，罗盘 (IC) 系列:- 标准包装:1 系列:- 传感范围:20mT ~ 80mT 类型:旋转 电源电压:4.5 V ~ 5.5 V 电流 - 电源:15mA 电流 - 输出（最大）:- 输出类型:数字式，PWM，8.5 位串行 特点:可编程 工作温度:-40°C ~ 150°C 封装/外壳:20-SSOP（0.209"，5.30mm 宽） 供应商设备封装:20-SSOP 包装:Digi-Reel® 其它名称:AS5132-HSST-500DKR |
| A3250EUA-T | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Field-Programmable, Chopper-Stabilized Unipolar Hall-Effect Switches |
| A3250JUA | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Field-Programmable, Chopper-Stabilized Unipolar Hall-Effect Switches |
| A3250JUATL | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Field-Programmable, Chopper-Stabilized Unipolar Hall-Effect Switches |
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