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LT6301 Datasheet(PDF) 9 Page - Linear Technology |
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LT6301 Datasheet(HTML) 9 Page - Linear Technology |
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9 / 16 page  9 LT6301 sn6301 6301f APPLICATIO S I FOR ATIO These modes can be useful for overall system power management when full power transmissions are not nec- essary. Contact LTC Applications for single supply design information. Shutdown and Recovery The ultimate power saving action on a completely idle port is to fully shut down the line driver by pulling the SHDN pin to within 0.4V of the SHDNREF potential. As shown in Figure 5 complete shutdown occurs in less than 10 µs and, more importantly, complete recovery from the shut down state to full operation occurs in less than 2 µs. The biasing circuitry in the LT6301 reacts very quickly to bring the amplifiers back to normal operation. Power Dissipation and Heat Management xDSL applications require the line driver to dissipate a significant amount of power and heat compared to other components in the system. The large peak to RMS varia- tions of DMT and CAP ADSL signals require high supply voltages to prevent clipping, and the use of a step-up transformer to couple the signal to the telephone line can require high peak current levels. These requirements result in the driver package having to dissipate significant amounts of power. Several multiport cards inserted into a rack in an enclosed central office box can add up to many, many watts of power dissipation in an elevated ambient temperature environment. The LT6301 has built- in thermal shutdown circuitry that will protect the ampli- fiers if operated at excessive temperatures, however data transmissions will be seriously impaired. It is important in the design of the PCB and card enclosure to take measures to spread the heat developed in the driver away to the ambient environment to prevent thermal shutdown (which occurs when the junction temperature of the LT6301 exceeds 165 °C). Estimating Line Driver Power Dissipation Figure 6 is a typical ADSL application shown for the purpose of estimating the power dissipation in the line driver. Due to the complex nature of the DMT signal, VSHDN SHDNREF = 0V AMPLIFIER OUTPUT 6301 F05 Figure 5. Shutdown and Recovery Timing Figure 6. Estimating Line Driver Power Dissipation 6301 F06 + – B –IN – + A +IN 12V 20mA DC SHDN –12V –2VRMS 17.4 Ω 24.9k – SETS IQ PER AMPLIFIER = 10mA 1:1.7 110 Ω 1000pF 110 Ω 1k 1k 17.4 Ω SHDNREF 100 Ω 3.16VRMS ILOAD = 57mARMS 2VRMS |
Similar Part No. - LT6301_15 |
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Similar Description - LT6301_15 |
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