DC337A Development Boards & Evaluation Kits by Linear Technology

DEMO BOARD STEP DOWN CONTROLLER

Education Maker & Hobbyist Electronics>Development Boards & Evaluation Kits>Power Management Development Kits
Status: Unknown
Series: -
RoHS: Unknown
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PRE-RELEASE DEMO MANUAL DC(1775) LTC1775 High Power No RSENSE Stepdown Controller Demonstration Circuit (1775) is a constant frequency stepdown (buck) regulator for high power applications using the LTC1775 No RSENSE controller. The regulator delivers up to 10A at fixed output voltages of 3.3V and 5V. The output voltage can also be adjusted with an external feedback divider from 1.19V up to 12V. Input voltages can range from 4.5V up to 28V. The LTC1775 controller uses a current mode, constant frequency architecture to switch a pair of Nchannel power MOSFETs. Current mode control is provided without using a sense resistor by monitoring the voltage drop across the MOSFET switches in order to determine the inductor current. By eliminating the power loss in the sense resistor, PERFORMANCE SUMMARY SYMBOL VIN efficiencies in excess of 95% are readily achieved without sacrificing the advantages of current mode control such as inherent current limiting, excellent rejection of line transients, and simple compensation. At low output currents, the LTC1775 automatically changes to Burst ModeTM operation to reduce switching losses and maintain high operating efficiency. Additionally, the supply current can be shut down to less than 20uA to maximize battery life in portable applications. This board is intended for applications such as notebook computers, automotive electronics, and distributed power systems. Gerber files for this circuit board are available. Call the LTC factory. Operating Temperature Range 0C to 50C ∆VOUT(RIPPLE) Output Voltage Ripple at VIN=10V, VOUT=5V, IOUT=5A VALUE 4.5V to 28V 10A 3.3V, 5V 1.19V to 12V 50mV ∆VOUT(LOADREG) Output Voltage Ripple at VIN=10V, VOUT=5V, IOUT=0.5A (Burst Mode) Load Regulation, IOUT=0A to 10A, Continuous Mode 100mV -0.2% Line Regulation, VIN=4.5V to 20V, Continuous Mode 0.05% Supply Current at VIN=10V, IOUT=0A, FCB=INTVCC (Burst Mode), EXTVCC=5V Supply Current in Shutdown at VIN=10V EXTVCC Pin Current at VIN=10V, IOUT=0A, FCB=INTVCC (Burst Mode), EXTVCC=5V RUN/SS Pin Threshold Switching Frequency, SYNC=0V 300uA 15uA 550uA 1.4V 150kHz IOUT(MAX) VOUT ∆VOUT(LINEREG) IQ IEXTVCC VRUN/SS f CONDITIONS Input Voltage Range (Maximum input voltage limited by external MOSFET and input capacitor) Maximum Output Current Output Voltage (Jumper selectable) Output Voltage (Adjustable, limited by output capacitor) TYPICAL PERFORMANCE CHARACTERISTICS AND BOARD PHOTO CBU:manual.doc December 17, 2002 LINEAR TECHNOLOGY CONFIDENTIAL 1

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Features

Specifications

Silicon Manufacturer Linear Technology
Silicon Core Number LTC1775
Kit Application Type Power Management - Voltage Regulator
Application Sub Type Step Down DC / DC Regulator
Kit Contents Demonstration Board LTC1775
Product Range -
Automotive Qualification Standard -
SVHC No SVHC (07-Jul-2017)
Features High Power No Rsense Current Mode 4.5 to 28V I/P Regulator Delivers up to 10A at O/P 3.3V & 5V

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