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| 型号： | A1212LUA-T |
| 元件分类： | 磁阻传感器 |
| 英文描述： | MAGNETIC FIELD SENSOR-HALL EFFECT, -17.5-17.5mT, 400mV, RECTANGULAR, THROUGH HOLE MOUNT |
| 封装： | LEAD FREE, ULTRA MINI, SIP-3 |
| 文件页数： | 2/12页 |
| 文件大小： | 443K |
| 代理商： | A1212LUA-T |
10
A1210-DS
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Continuous-Time Latch Family
A1210, A1211, A1212, A1213, and A1214
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| A1212M-1W | 制造商:MORNSUN 制造商全称:MORNSUN 功能描述:DUAL/SINGLE OUTPUT,SUPERMINIATURE SIP PACKAGE |
| A1212NXT-1W | 制造商:MICRODC 制造商全称:MICRODC 功能描述:1W, FIXED INPUT, ISOLATED DUAL OUTPUT SMD DC-DC CONVERTER |
| A1212NXT-2W | 制造商:MICRODC 制造商全称:MICRODC 功能描述:2 Watt FIXED INPUT, ISOLATED Dual SMD Output DC-DC CONVERTER |
| A1212S | 制造商:M/A-COM Technology Solutions 功能描述:10-1200 MHZ CASCADABLE AMPLIFIER TO-8 PKG,SCREENED - Bulk |
| A1212S-1W | 制造商:MICRODC 制造商全称:MICRODC 功能描述:输入 输出 典型效率 输出纹波噪声 型号 输入电压 输入电压范围 输出电压 输出电流 （V） （V） （V） （MA） （%） MV P-P 5 4.5-5.5 ±5 ±100 69 50 A0505S-1W ±9 ±55 75 50 A0509S-1W ±12 ±42 77 50 A0512S-1W ±15 ±33 78 50 A0515S-1W 12 10.8-13.2 ±5 ±100 69 50 A1205S-1W ±9 ±55 74 50 A1209S-1W ±12 ±42 75 50 A1212S-1W ±15 ±33 76 50 A1215S-1W 24 21.6-26.4 ±5 ±100 70 50 A2405S-1W ±9 ±55 77 50 A2409S-1W ±12 ±42 80 50 A2412S-1W ±15 ±33 80 50 A2415S-1W |
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