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## MSK0024 Fiches technique(PDF) 3 Page - M.S. Kennedy Corporation

 No de pièce MSK0024 Description HIGH SPEED OPERATIONAL AMPLIFIER Download 5 Pages Scroll/Zoom 100% Fabricant MSK [M.S. Kennedy Corporation] Site Internet http://www.mskennedy.com Logo

## MSK0024 Fiches technique(HTML) 3 Page - M.S. Kennedy Corporation

 3 / 5 pageAPPLICATION NOTES3Rev. A3/03HEAT SINKINGTo determine if a heat sink is necessary for your appli-cation and if so, what type, refer to the thermal modeland governing equation below.Thermal Model:Governing Equation:TJ = PD X (RθJC + RθCS + RθSA) + TAWhereTJ= Junction TemperaturePD= Total Power DissipationRθJC= Junction to Case Thermal ResistanceRθCS = Case to Heat Sink Thermal ResistanceRθSA = Heat Sink to Ambient Thermal ResistanceTC= Case TemperatureTA= Ambient TemperatureTS= Sink TemperatureExample:The example demonstrates a worst case analysis forthe op-amp output stage. This occurs when the outputvoltage is 1/2 the power supply voltage. Under this con-dition, maximum power transfer occurs and the outputis under maximum stress.Conditions:VCC=±16VDCVOUT=±8Vp Sine Wave, Freq.=1KHzRL=200ΩFor a worst case analysis we treat the +8Vp sine waveas an 8 VDC output voltage.1.) Find driver power dissipationPD=(VCC-VOUT) (VOUT/RL)=(16V-8V) (8V/200Ω)=320mW2.) For conservative design, set TJ =+125°C.3.) For this example, worst case TA =+100°C.4.) RθJC = 58°C/W from MSK 032B Data Sheet.5.) RθCS=0.15°C/W for most thermal greases.6.) Rearrange governing equation to solve for RθSA:RθSA= ((TJ - TA) / PD) - (RθJC) - (RθCS)= (125°C - 100°C)/0.32W - 58°C/W - 0.15°C/W=78.1 - 58.15=19.9°C/WThe heat sink in this example must have a thermalresistance of no more than 19.9°C/W to maintain a junc-tion temperature of less than +125°C.INPUT CONSIDERATIONSAn input resistor (RIN below) is required in circuitswhere the input to the MSK0024 will be subjected totransient or continuous voltages exceeding the ±6Vmaximum differential limit. This resistor will limit the cur-rent that can be forced into the bases of the input tran-sistors.FEEDBACK RESISTORSFeedback resistors should be of low enough value(<5K recommended) to ensure that the time constantformed with the capacitance at the summing junctionwill not limit amplifier performance. If a larger resistormust be used, a small (< 10pF) feedback capacitor maybe used in parallel with the feedback resistor to compen-sate and optimize the performance of the MSK0024.TYPICAL APPLICATION CIRCUITPOWER SUPPLY BYPASSINGBoth the negative and positive power supplies must beeffectively decoupled with a high and low frequencybypass circuit to avoid power supply induced oscillation.An effective decoupling scheme consists of a 0.1 micro-farad ceramic capacitor in parallel with a 4.7 microfaradtantalum capacitor from each power supply pin to ground.

## Numéro de composants électroniques

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