- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄375097 > A1140LUATI-T4 (Allegro MicroSystems, Inc.) Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches PDF資料下載
參數(shù)資料
| 型號(hào)： | A1140LUATI-T4 |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches |
| 中文描述： | 敏感的兩線斬波穩(wěn)定單極霍爾效應(yīng)開關(guān) |
| 文件頁(yè)數(shù)： | 10/13頁(yè) |
| 文件大?。?/td> | 354K |
| 代理商： | A1140LUATI-T4 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)當(dāng)前第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)
Sensitive Two-Wire Chopper-Stabilized
Unipolar Hall Effect Switches
A1140, A1141,
A1142, and A1143
10
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 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)
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, specifically:
R
θ
JA
=
165°C/W, T
J(max)
=
165°C, V
CC(max)
=
24 V, and
I
CC(max)
=
17
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 ÷ 17 mA = 5 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(guān)PDF資料 |
PDF描述 |
|---|---|
| A1141 | Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches |
| A1141EUATI-T4 | Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches |
| A1141LUATI-T4 | Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches |
| A1142 | Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches |
| A1142ELHLT-T | Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| A1141 | 制造商:Quick 功能描述:PLCC 11.5 X 14 NOZZLE FOR QUICK957/957D |
| A114106 | 制造商:NORTH SAFETY PRODUCTS 功能描述:HELMET FULL FACE WITH FACE SEAL. |
| A-1141-1 | 功能描述:通用繼電器 DC SOLENOID. RoHS:否 制造商:Omron Electronics 觸點(diǎn)形式:1 Form A (SPST-NO) 觸點(diǎn)電流額定值:150 A 線圈電壓:24 VDC 線圈電阻:144 Ohms 線圈電流:167 mA 切換電壓:400 V 安裝風(fēng)格:Chassis 觸點(diǎn)材料: |
| A114132A1NCRB | 制造商:C&K Components 功能描述:SP,90,2POS,HI,NON SHORT,PC THRU,BULK - Bulk 制造商:C&K Components 功能描述:Switch Key Lock SPDT 90° Flat Key 20VAC 20VDC 0.4VA PC Pins Thru-Hole |
| A114132A1NCRQ | 功能描述:鍵鎖開關(guān) Switchlocks RoHS:否 制造商:C&K Components 觸點(diǎn)形式:1 Form A (SPST-NO) 開關(guān)功能:Momentary 觸點(diǎn)額定值: 電流額定值:100 mA 電壓額定值 AC:250 VAC 端接類型:Through Hole 鍵類型:Keyswitch 變址: 位置數(shù)量:1 外殼材料: |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。