전자부품 데이터시트 검색엔진 |
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ISL28286 데이터시트(PDF) 13 Page - Intersil Corporation |
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ISL28286 데이터시트(HTML) 13 Page - Intersil Corporation |
13 / 15 page 13 FN6312.0 September 22, 2006 to the PC board using Teflon standoff insulators. Example Application Thermocouples are the most popular temperature-sensing device because of their low cost, interchangeability, and ability to measure a wide range of temperatures. The ISL28286 (Figure 45) is used to convert the differential thermocouple voltage into single-ended signal with 10X gain. The ISL28286's rail-to-rail input characteristic allows the thermocouple to be biased at ground and the converter to run from a single 5V supply. Current Limiting The ISL28286 and ISL28486 have no internal current- limiting circuitry. If the output is shorted, it is possible to exceed the Absolute Maximum Rating for output current or power dissipation, potentially resulting in the destruction of the device. Power Dissipation It is possible to exceed the +150°C maximum junction temperatures under certain load and power-supply conditions. It is therefore important to calculate the maximum junction temperature (TJMAX) for all applications to determine if power supply voltages, load conditions, or package type need to be modified to remain in the safe operating area. These parameters are related as follows: where: •PDMAXTOTAL is the sum of the maximum power dissipation of each amplifier in the package (PDMAX) •PDMAX for each amplifier can be calculated as follows: where: •TMAX = Maximum ambient temperature • θJA = Thermal resistance of the package •PDMAX = Maximum power dissipation of 1 amplifier •VS = Supply voltage •IMAX = Maximum supply current of 1 amplifier •VOUTMAX = Maximum output voltage swing of the application •RL = Load resistance 1/2 ISL28286 IN V+ FIGURE 44. GUARD RING EXAMPLE FOR UNITY GAIN AMPLIFIER HIGH IMPEDANCE INPUT - + 5V + V+ V- ISL28286 K TYPE THERMOCOUPLE 10k Ω R3 10k Ω R2 R4 100k Ω R1 100k Ω 410µV/°C FIGURE 45. THERMOCOUPLE AMPLIFIER T JMAX T MAX θ JAxPDMAXTOTAL () + = (EQ. 1) PD MAX 2*V S I SMAX V S ( - V OUTMAX ) V OUTMAX R L ---------------------------- × + × = (EQ. 2) ISL28286, ISL28486 |
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