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参数资料
| 型号： | A1220LUA-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 12/16页 |
| 文件大小： | 347K |
| 描述： | IC HALL EFFECT LATCH 3V 3-SIP |
| 产品培训模块： | Current Sensor |
| 标准包装： | 4,000 |
| 传感范围： | 40G 跳闸，-40G 释放 |
| 类型： | 双极卡锁 |
| 电源电压： | 3 V ~ 24 V |
| 电流 - 电源： | 4mA |
| 电流 - 输出（最大）： | 25mA |
| 输出类型： | 数字式，开漏极 |
| 特点： | 稳压电压 |
| 工作温度： | -40°C ~ 150°C |
| 封装/外壳： | 3-SIP |
| 供应商设备封装： | 3-SIP |
| 包装： | 散装 |
| 其它名称： | 620-1446 A1220LUA-T-ND |
Chopper Stabilized Precision Hall Effect Latches
A1220, A1221,
A1222, and A1223
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 combinations of
peak conditions, reliable operation may require derating supplied
power or improving the heat dissipation properties of the appli-
cation. This section presents a procedure for correlating factors
affecting operating T
J
. (Thermal data is also available on the
Allegro MicroSystems website.)
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
= 1.6 mA, and R
qJA
= 165 癈/W, then:
P
D
= V
CC
?/DIV>
I
CC
= 12 V
?/DIV>
1.6 mA = 19 mW
DT = P
D
?/DIV>
R
qJA
= 19 mW
?/DIV>
165 癈/W = 3癈
T
J
= T
A
+ DT = 25癈 + 3癈 = 28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 LH, using a
minimum-K PCB.
Observe the worst-case ratings for the device, specifically:
R
qJA
=
228癈/W, T
J
(max)
=
165癈, V
CC
(max)
=
24 V, and
I
CC
(max)
=
4
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 ?228 癈/W = 66 mW
Finally, invert equation 1 with respect to voltage:
V
CC(est)
= P
D
(max)
? I
CC
(max) = 66 mW ?4 mA = 16.4 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 |
参数描述 |
|---|---|
| A1220LUA-T | 制造商:Allegro MicroSystems 功能描述:Hall Effect Latch IC |
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