- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄352488 > A1181 (Allegro MicroSystems, Inc.) Two-Wire, Programmable, Chopper-Stabilized, Unipolar Hall-Effect Switch PDF資料下載
參數(shù)資料
| 型號： | A1181 |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | Two-Wire, Programmable, Chopper-Stabilized, Unipolar Hall-Effect Switch |
| 中文描述： | 兩線，可編程，斬波穩(wěn)定，單極霍爾效應開關(guān) |
| 文件頁數(shù)： | 3/16頁 |
| 文件大小： | 356K |
| 代理商： | A1181 |
11
A1180-DS, Rev. 2
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches
A1180/81/82/83
Power Derating
The device must be operated below the maximum junction
temperature of the device, TJ(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 TJ. (Thermal data is also available on
the Allegro MicroSystems Web site.)
The Package Thermal Resistance, RθJA, 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, RθJC, is
relatively small component of RθJA. Ambient air temperature,
TA, and air motion are signicant external factors, damped by
overmolding.
The effect of varying power levels (Power Dissipation, PD), can
be estimated. The following formulas represent the fundamental
relationships used to estimate TJ, at PD.
PD = VIN
× IIN
(1)
ΔT = PD
× RθJA
(2)
TJ = TA + ΔT
(3)
For example, given common conditions such as: TA= 25°C,
VCC = 12 V, ICC = 4 mA, and RθJA = 140 °C/W, then:
PD = VCC
× ICC = 12 V × 4 mA = 48 mW
ΔT = PD
× RθJA = 48 mW × 140 °C/W = 7°C
TJ = TA + ΔT = 25°C + 7°C = 32°C
A worst-case estimate, PD(max), represents the maximum allow-
able power level (VCC(max), ICC(max)), without exceeding TJ(max),
at a selected RθJA and TA.
Example: Reliability for VCC at TA=150°C, package UA, using
minimum-K PCB.
Observe the worst-case ratings for the device, specically:
RθJA=165°C/W, TJ(max) =165°C, VCC(max)= 24 V, and
ICC(max) = 17 mA.
Calculate the maximum allowable power level, PD(max). First,
invert equation 3:
ΔTmax = TJ(max) – TA = 165°C–150°C = 15°C
This provides the allowable increase to TJ resulting from internal
power dissipation. Then, invert equation 2:
PD(max) = ΔTmax÷RθJA =15°C÷165 °C/W=91mW
Finally, invert equation 1 with respect to voltage:
VCC(est) = PD(max) ÷ ICC(max)= 91mW÷17mA=5 V
The result indicates that, at TA, the application and device can
dissipate adequate amounts of heat at voltages ≤VCC(est).
Compare VCC(est) to VCC(max). If VCC(est) ≤ VCC(max), then reli-
able operation between VCC(est) and VCC(max) requires enhanced
RθJA. If VCC(est) ≥ VCC(max), then operation between VCC(est) and
VCC(max) is reliable under these conditions.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| A1181EUA | CONV DC-DC 48V IN 3.3/2.5V OUT |
| A1181EUA-T | Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches |
| A3141-LT | SENSITIVE HALL-EFFECT SWITCHES FOR HIGH-TEMPERATURE OPERATION |
| A3141-U | SENSITIVE HALL-EFFECT SWITCHES FOR HIGH-TEMPERATURE OPERATION |
| A3141-UA | SENSITIVE HALL-EFFECT SWITCHES FOR HIGH-TEMPERATURE OPERATION |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| A118-1 | 功能描述:SWITCH HARDWARE RoHS:是 類別:開關(guān) >> 配件 - 帽蓋 系列:800 標準包裝:1 系列:AP 開關(guān)類型:按鈕 形狀:圓形，凸起（圓頂） 顏色:紅 發(fā)光:發(fā)光開口 適用于相關(guān)產(chǎn)品:AP 系列 安裝類型:卡入式 尺寸:12.35mm 直徑 x 6.25mm H 特點:- 配用:AP2N006TZBE-ND - SWITCH PUSH SPST-NO 0.125A 125VAP2N003TZBE-ND - SWITCH PUSH SPST-NO 0.125A 125VAP2N002TZBE-ND - SWITCH PUSH SPST-NO 0.125A 125VAP2N006SZBE-ND - SWITCH PUSH SPST-NO 0.125A 125VAP2N003SZBE-ND - SWITCH PUSH SPST-NO 0.125A 125VAP2N002SZBE-ND - SWITCH PUSH SPST-NO 0.125A 125VAP4N007SWBE-ND - SWITCH PUSH SPST-NO 0.125A 125VAP2N007TZBE-ND - SWITCH PUSH SPST-NO 0.125A 125VAP2N007SZBE-ND - SWITCH PUSH SPST-NO 0.125A 125VAP4N006TZBE-ND - SWITCH PUSH SPST-NO 0.125A 125V更多... 其它名稱:*481D03001 |
| A1181ELHLT | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches |
| A1181ELHLT-T | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches |
| A1181EUA | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches |
| A1181EUA-T | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches |
發(fā)布緊急采購，3分鐘左右您將得到回復。