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參數(shù)資料
| 型號(hào)： | A1190LUA-T |
| 元件分類(lèi)： | 磁阻傳感器 |
| 英文描述： | MAGNETIC FIELD SENSOR-HALL EFFECT, 1-20mT, RECTANGULAR, THROUGH HOLE MOUNT |
| 封裝： | 1.50 X 4 MM, 3 MM HEIGHT, LEAD FREE, SIP-3 |
| 文件頁(yè)數(shù)： | 7/18頁(yè) |
| 文件大小： | 427K |
| 代理商： | A1190LUA-T |
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Power Derating
Programmable, Chopper-Stabilized,
Two Wire Hall-Effect Switches
A1190, A1192,
and A1193
15
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
The device must be operated below the maximum junction tem-
perature of the device, TJ(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 TJ. (Thermal data is also available on the
Allegro MicroSystems Web site.)
The Package Thermal Resistance, RJA, 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, RJC, is relatively
small component of RJA. 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
× RJA
(2)
TJ = TA + ΔT
(3)
For example, given common conditions such as: TA= 25°C,
VCC = 12 V, ICC = 4 mA, and RJA = 140 °C/W, then:
PD = VCC
× ICC = 12 V × 4 mA = 48 mW
T = PD
× RJA = 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 RJA and TA.
Example: Reliability for VCC at TA=150°C, package UA, using a
low-K PCB.
Observe the worst-case ratings for the device, specifically:
RJA=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:
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÷RJA =15°C÷165 °C/W=91mW
Finally, invert equation 1 with respect to voltage:
VCC(est) = PD(max) ÷ ICC(max)= 91mW÷17 mA=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
RJA. 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 |
|---|---|
| A1192LUA-T | MAGNETIC FIELD SENSOR-HALL EFFECT, 1-20mT, RECTANGULAR, THROUGH HOLE MOUNT |
| A1210LLHLT-T | MAGNETIC FIELD SENSOR-HALL EFFECT, -15-15mT, 400mV, RECTANGULAR, SURFACE MOUNT |
| A1211ELHLT-T | MAGNETIC FIELD SENSOR-HALL EFFECT, -18-18mT, 400mV, RECTANGULAR, SURFACE MOUNT |
| A1212EUA-T | MAGNETIC FIELD SENSOR-HALL EFFECT, -17.5-17.5mT, 400mV, RECTANGULAR, THROUGH HOLE MOUNT |
| A1213ELHLT-T | MAGNETIC FIELD SENSOR-HALL EFFECT, -20-20mT, 400mV, RECTANGULAR, SURFACE MOUNT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| A1190LUBTN-T | 功能描述:2-WIRE FIELD PROGRAMMABLE SWITCH 制造商:allegro microsystems, llc 系列:* 零件狀態(tài):新產(chǎn)品 標(biāo)準(zhǔn)包裝:1 |
| A1191 | 制造商:Quick 功能描述:SIP 25L 25mm Nozzle for 21-13205 and 21-13210 制造商:QUICK 功能描述:SIP 25L NOZZLE FOR QUICK957/957D |
| A-1191-1 | 功能描述:固態(tài)繼電器-工業(yè)安裝 DC SOLENOID RoHS:否 制造商:Crydom 控制電壓范圍:4 VDC to 32 VDC 負(fù)載電壓額定值:7 VDC to 72 VDC 負(fù)載電流額定值:160 A 觸點(diǎn)形式: 輸出設(shè)備:SSR 安裝風(fēng)格:Panel |
| A1192 | 制造商:Quick 功能描述:SIP 50LNOZZLE FOR QUICK957/957D |
| A11927-01 | 制造商:LAIRD TECHNOLOGIES - THERMAL MATERIALS 功能描述:TGON 810 SA 18" X 23" 制造商:Laird Technologies Inc 功能描述:TGON 810 SA 18" X 23" 制造商:Laird Technologies Inc 功能描述:TGON 810,SA / 18 X 23 |
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