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EL5364IUZT13 Datasheet(PDF) 11 Page - Intersil Corporation |
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EL5364IUZT13 Datasheet(HTML) 11 Page - Intersil Corporation |
11 / 12 page 11 choice for driving isolation transformers in telecommunications applications. 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 EL5164, EL5165, and EL5364 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 EL5164, EL5165, and EL5364 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 With the high output drive capability of the EL5164, EL5165, and EL5364, it is possible to exceed the 125°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 EL5164, EL5165, and EL5364 to remain in the safe operating area. These parameters are calculated as follows: 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: where: •VS = Supply voltage •ISMAX = Maximum supply current of 1A •VOUTMAX = Maximum output voltage (required) •RL = Load resistance Typical Application Circuits FIGURE 23. INVERTING 200mA OUTPUT CURRENT DISTRIBUTION AMPLIFIER FIGURE 24. FAST-SETTLING PRECISION AMPLIFIER T JMAX T MAX θ JA nPD MAX × × () + = PD MAX 2 ( V S I SMAX ) V S ( V OUTMAX ) V OUTMAX R L ---------------------------- × – + × × = IN+ IN- VS+ VS- OUT IN+ IN- VS+ VS- OUT 0.1µF +5V 0.1µF -5V 375 Ω 5 Ω 5 Ω 375 Ω 375 Ω VOUT VIN 0.1µF 0.1µF +5V -5V IN+ IN- VS+ VS- OUT IN+ IN- VS+ VS- OUT 0.1µF +5V 0.1µF -5V 0.1µF 0.1µF 375 Ω 375 Ω 375 Ω 375 Ω VOUT VIN +5V -5V EL5164, EL5165, EL5364 |
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