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A1180 Datasheet(PDF) 10 Page - Allegro MicroSystems |
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A1180 Datasheet(HTML) 10 Page - Allegro MicroSystems |
10 / 14 page TWO-WIRE, PROGRAMMABLE, UNIPOLAR HALL-EFFECT SWITCH FAMILY (PRELIMINARY INFORMATION – SUBJECT TO CHANGE) Rev. 1.8 25 April 2003 Page 10 115 Northeast Cutoff, Box 15036 Worcester, Massachus etts 01615-0036 (508) 853-5000 Copyright © 1993, 1995 Allegro MicroSystems, Inc. POWER DE-RATING Due to internal power consumption, the junction temperature of the IC, Tj, is higher than the ambient environment temperature, Ta. To ensure that the device does not operate above the maximum rated junction temperature use the following calculations: ∆T = P D * Rθja Where: PD = Vcc * Icc ∴ ∆T=Vcc * Icc * Rθja Where ∆T denotes the temperature rise resulting from the IC’s power dissipation. Tj = Ta + ∆T For the sensor : Tj(max) = 170°C R θja (UA Pkg) = 206°C/W Typical Tj calculation: Ta = 25 °C Vcc = 12 V Icc = IccONtyp = 14.5 mA PD = Vcc * Icc = 12 V * 14.5 mA = 174 mW ∆T = P D * Rθja = 174 mW * 206°C/W = 35.8 °C Tj = Ta + ∆T = 25 °C + 35.8 °C = 60.8 °C Maximum Allowable Power Dissipation Calculation for A118X Family 7: Assume: Ta = Tamax = 150 °C Tj(max) = 170°C Icc = IONmax = 17 mA If: Tj = Ta + ∆T Then: ∆T max = Tjmax – Ta max = 170 °C - 150 °C = 20 °C If: ∆T = P D * Rθja Then: PDmax = ∆Tmax / Rθja = 20 °C / 206 °C/W = 97.1 mW If: PD = Vcc * Icc Then the maximum Vcc at 150°C is therefore: Vccmax = PDmax / Icc = 97.1 mW / 17 mA = 5.7 V Maximum Supply Voltage vs Ambient Temperature 0 5 10 15 20 25 30 0 25 50 75 100 125 150 Temperature (°C) UA (ROJA = 206°C/W) LH (ROJA = 228°C/W) 7 The “LH” PPD is based on a 0.062" thick FR4, single-sided board using 2 oz. copper, with a 0.55 mm2 area of copper attached to the ground lead. |
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