Analog Devices LTC3871 | Demoboard DC2348A-A

Description

Demonstration circuit 2348A is a high power highefficiency bi-directional synchronous buck or boostconverter featuring the LTC®3871 and is available in twoversions. The DC2348A-A operates with two each LTC3871devices with four phases and the DC2348A-B utilizes oneLTC3871 device with two phases.When operating in buck mode, this demo circuit has aninput voltage range of 30V to 75V and produces a 12Voutput. When operating in boost mode, the input voltageis from 10V to 13V and produces a 48V output voltage.Both boards have a switch that allows the converter torun in either buck or boost mode. A DC voltage sourcecan be connected to the SETCUR turret to set the averageinductor current in each phase of the converter. Both boardsalso utilize a mode jumper to select forced continuousconduction mode, buck-mode only pulse-skipping or fullpulse-skipping mode for buck and boost.L, LT, LTC, LTM, Linear Technology, PolyPhase and the Linear logo are registered trademarksof Linear Technology Corporation. All other trademarks are the property of their respectiveowners.Performance SummarySynchronization to an external clock (frequency range 100kHz to 300 kHz) is also possible on these boards.The demo circuit senses inductor current with a senseresistor. An optional DCR sense circuit utilizes theinductor’s DCR as the current sensing element furthersaving cost, footprint and improving efficiency.The LTC3871 data sheet gives a complete description ofthe part’s operation and application information and mustbe read in conjunction with this quick start guide

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