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Linear Technology Corporation LT4180 Backgrounder Tony Armstrong Director of Product Marketing
© 2006 Linear Technology 2 LT4180 Virtual Remote Sense Controller Background Limitations of Remote Voltage Sensing w/ Wires Advantages of Virtual Remote Sensing w/o Wires LT4180 Definition Features & Benefits How Does it Work How Well Does it Work Application Circuits Target Markets Target Applications
© 2006 Linear Technology 3 Remote Sense Background Why Remote Sense? Voltage drop (IR Losses) in cables and wiring IR losses can cause the regulation at the load to exceed its limit Remote sense with 2 wires works but has limitations Remote Sense Wire Limitations Extra wires can be impractical Less reliable Higher cost Not available in 2-wire cables
© 2006 Linear Technology 4 LT4180: Virtual Remote Sense – What is it?
© 2006 Linear Technology 5 LT4180: VRS Block Diagram and Waveform NOTE: Voltage at the load is 5V
© 2006 Linear Technology 6 LT4180 Virtual Remote Sense Features Tight Load Regulation with Highly Resistive Cables without Requiring Remote Sense Wires Compatible with all Conversion Topologys including Isolated and Non-Isolated Power Supplies V IN Range: 3V to 50V Wide V OUT Range: 1.21V to 50V 5mA Sink Current Capability to Drive Opto-Coupler Accurate ±1% Internal Reference Voltage Soft-Correct Reduces Turn-On Transients Undervoltage and Overvoltage Protection Programmable or Synchronizable Dither Frequency Optional Spread Spectrum Dither Frequency
© 2006 Linear Technology 7 LT4180: How Does it Work? LT4180 forces a current delta of ±5% of the output current Square wave current at a programmable dither frequency A decoupling capacitor filters out dither current at the load and is sized for low impedance (AC short) at the programmed dither frequency This results in a voltage equal to 1/10 the drop in the cable The LT4180 adjusts the regulation voltage locally at the regulator output to compensate for the cable drop. This assures tight regulation at the other end of the cable, where the load is.
© 2006 Linear Technology 8 LT4180 – How Well Does it Work?
© 2006 Linear Technology 9 LT4180: Typical Buck Application Schematic
© 2006 Linear Technology 10 LT4180: Typical Isolated Application Schematic
© 2006 Linear Technology 11 LT4180: Typical Boost (5V 12V) Applications Schematic
© 2006 Linear Technology 12 LT4180: Package
© 2006 Linear Technology 13 LT4180 Typical Applications CAT5 & CAT6 Cable Systems Wall Adaptors Notebook Computer Power Remote Surveillance Equipment Halogen Lighting Well-Logging Remote Instrumentation Battery Charging PDAs
© 2006 Linear Technology 14 LT4180: Conclusion LT4180 is a revolutionary new way to compensate for wiring and cable voltage drops Limitless applications Works with any conversion topology Numerous features & benefits
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