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參數(shù)資料
| 型號： | A1101ELHLT-T |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | Continuous-Time Switch Family |
| 中文描述： | 連續(xù)時間開關系列 |
| 文件頁數(shù)： | 11/11頁 |
| 文件大?。?/td> | 428K |
| 代理商： | A1101ELHLT-T |
9
A1101-DS
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Continuous-Time Switch Family
A1101, A1102, A1103, A1104, and A1106
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 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, RθJC, is
relatively small component of RθJA. Ambient air temperature,
TA, and air motion are significant 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)
T = PD
× RθJA
(2)
TJ = TA + T
(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
T = PD
× RθJA = 48 mW × 140 °C/W = 7°C
TJ = TA + T = 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, specifically:
RθJA=165°C/W, TJ(max) =165°C, VCC(max)= 24 V, and
ICC(max) = 7.5 mA.
Calculate the maximum allowable power level, PD(max). First,
invert equation 3:
Tmax = 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) = Tmax÷RθJA =15°C÷165 °C/W=91mW
Finally, invert equation 1 with respect to voltage:
VCC(est) = PD(max) ÷ ICC(max)= 91mW÷7.5mA=12.1 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.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| A1101ELHLT-T | 制造商:Allegro MicroSystems 功能描述:Hall Effect IC Operate Point Typ.:100Gau |
| A1101ELHLX-T | 制造商:Allegro MicroSystems LLC 功能描述:IC HALL EFFECT SWITCH SOT23W 制造商:Allegro MicroSystems LLC 功能描述:CONTINUOUS TIME UNIPOLAR SWITCH |
| A1101EUA-T | 功能描述:IC SWITCH HALL EFFECT 3-SIP RoHS:是 類別:傳感器，轉換器 >> 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 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 |
| A1101EUA-T | 制造商:Allegro MicroSystems 功能描述:Hall Effect IC Operate Point Typ.:100Gau |
| A1101EU-T | 制造商:Allegro MicroSystems LLC 功能描述: |
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