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EL2270CN Datasheet(PDF) 11 Page - Intersil Corporation |
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EL2270CN Datasheet(HTML) 11 Page - Intersil Corporation |
11 / 14 page 11 Driving Cables and Capacitive Loads When used as a cable driver, double termination is always recommended for reflection-free performance. For those applications, the back-termination series resistor will decouple the EL2170, EL2270, and EL2470 from the cable and allow extensive capacitive drive. However, other applications may have high capacitive loads without a back- termination resistor. In these applications, a small series resistor (usually between 5 Ω and 50Ω) can be placed in series with the output to eliminate most peaking. The gain resistor (RG) can then be chosen to make up for any gain loss which may be created by this additional resistor at the output. In many cases it is also possible to simply increase the value of the feedback resistor (RF) to reduce the peaking. Current Limiting The EL2170, EL2270, and EL2470 have no internal current- limiting circuitry. If any output is shorted, it is possible to exceed the Absolute Maximum Ratings for output current or power dissipation, potentially resulting in the destruction of the device. Power Dissipation With the high output drive capability of the EL2170, EL2270, and EL2470, it is possible to exceed the 150°C Absolute Maximum junction temperature under certain very high load current conditions. Generally speaking, when RL falls below about 25 Ω, it is important to calculate the maximum junction temperature (TJMAX) for the application to determine if power-supply voltages, load conditions, or package type need to be modified for the EL2170, EL2270, and EL2470 to remain in the safe operating area. These parameters are calculated as follows [1]: where: TMAX = Maximum ambient temperature θJA = Thermal resistance of the package n = Number of amplifiers in the package PDMAX = Maximum power dissipation of each amplifier in the package PDMAX for each amplifier can be calculated as follows [2]: where: VS = Supply voltage ISMAX = Maximum supply current of 1 amplifier VOUTMAX = Maximum output voltage of the application RL = Load resistance Typical Application Circuits T JMAX T MAX Θ JA nPD MAX × × () + = PD MAX 2 ( V S I SMAX ) V S ( - V OUTMAX ) V OUTMAX R L ---------------------------- × + × × = INVERTING 200mA OUTPUT CURRENT DISTRIBUTION AMPLIFIER FAST-SETTLING PRECISION AMPLIFIER EL2170, EL2270, EL2470 |
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