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## LT1969 Fiches technique(PDF) 11 Page - Linear Technology

 No de pièce LT1969 Description Dual 700MHz, 200mA, Adjustable Current Operational Amplifier Download 20 Pages Scroll/Zoom 100% Fabricant LINER [Linear Technology] Site Internet http://www.linear.com Logo

## LT1969 Fiches technique(HTML) 11 Page - Linear Technology

 11 / 20 page11LT1969were taken in still air on 3/32" FR-4 board with 2oz copper.This data can be used as a rough guideline in estimatingthermal resistance. The thermal resistance for each appli-cation will be affected by thermal interactions with othercomponents as well as board size and shape.Table 1. Fused 10-Lead MSOP PackageCOPPER AREATOPSIDE*BACKSIDEBOARD AREATHERMAL RESISTANCE(mm2)(mm2)(mm2)(JUNCTION-TO-AMBIENT)5405402500110°C/W1001002500120°C/W10002500130°C/W3002500135°C/W002500140°C/W*Device is mounted on topside.Calculating Junction TemperatureThe junction temperature can be calculated from theequation:TJ = (PD)(θJA) + TATJ = Junction TemperatureTA = Ambient TemperaturePD = Device DissipationθJA = Thermal Resistance (Junction-to-Ambient)As an example, calculate the junction temperature for thecircuit in Figure 1 assuming an 70°Cambienttemperature.The device dissipation can be found by measuring thesupply currents, calculating the total dissipation and thensubtracting the dissipation in the load.The dissipation for the amplifiers is:PD = (63.5mA)(12V) – (4V/√2)2/(50) = 0.6WThe total package power dissipation is 0.6W. When a 2500sq. mm PC board with 540 sq. mm of 2oz copper on topand bottom is used, the thermal resistance is 110°C/W.The junction temperature TJ is:TJ = (0.6W)(110°C/W) + 70°C = 136°CThe maximum junction temperature for the LT1969 is150°C so the heat sinking capability of the board isadequate for the application.If the copper area on the PC board is reduced to 0 sq. mmthe thermal resistance increases to 140°C/W and thejunction temperature becomes:TJ = (0.6W)(140°C/W) + 70°C = 154°Cwhich is above the maximum junction temperature indi-cating that the heat sinking capability of the board isinadequate and should be increased.APPLICATIO S I FOR ATIOFigure 1. Thermal Calculation Example–+6V–6V–6V–6V909Ω100Ω100Ω1969 F011K50Ω–4V4Vf = 1MHz13k649.9kCTRL1CTRL27

## Numéro de composants électroniques

 No de pièce Description Html View Fabricant LT1886 Dual 700MHz 200mA Operational Amplifier 1  2  3  4  5  More Linear Technology OP-260 DUAL HIGH-SPEED CURRENT FEEDBACK OPERATIONAL AMPLIFIER 1  2  3  4  5  More Analog Devices TS616 DUAL WIDE BAND OPERATIONAL AMPLIFIER WITH HIGH OUTPUT CURRENT 1  2  3  4  5  More STMicroelectronics OPA2658 Dual Wideband Low Power Current Feedback OPERATIONAL AMPLIFIER 1  2  3  4  5  More Burr-Brown (TI) OPA2677 Dual Wideband High Output Current OPERATIONAL AMPLIFIER 1  2  3  4  5  More Burr-Brown (TI) HFA1245 Dual 420MHz Low Power Video Current Feedback Operational Amplifier with Disable 1  2  3  4  5  More Intersil Corporation ZL40166 High Output Current High Speed Dual Operational Amplifier 1  2  3  4  5  More Zarlink Semiconductor Inc TSM102 DUAL OPERATIONAL AMPLIFIER - DUAL COMPARATOR AND ADJUSTABLE VOLTAGE REFERENCE 1  2  3  4  5  More STMicroelectronics NJM4556A DUAL HIGH CURRENT OPERATIONAL AMPLIFIER 1  2  3  4  5 New Japan Radio OPA2681 Dual Wideband Current Feedback OPERATIONAL AMPLIFIER With Disable 1  2  3  4  5  More Burr-Brown (TI)

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