Analog Devices LT8391D | Demoboard EVAL-LT8391D-AZ

Description

Evaluation circuit EVAL-LT8391D-AZ is a 4-switch synchronous buck-boost LED driver featuring the LT8391D. It drives a single string of LEDs at up to 1.5A and up to 50V when VIN is between 6V and 45V. EVAL-LT8391D-AZ runs at 400kHz switching frequency and efficiency can exceed 97%. It comes with low EMI features including optimized layout, spread spectrum frequency modulation (SSFM) and input EMI filter. SSFM can be turned on or off with a simple jumper.The LT8391D 4-swich buck-boost controller is the new member of the LT8391 family (see Table 1 in the user guide). It has an input voltage range of 4V to 60V and output voltage range of 0V to 60V. It has input under voltage lockout (UVLO) which can also be used to enable or disable the controller. On the output side, it is protected against both open and short LED conditions.

Features

• 4-Switch Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT
• Synchronous Switching: Up to 98% Efficiency
• Proprietary Peak-Buck Peak-Boost Current Mode
• Wide VIN Range: 4V to 60V
• Wide VOUT Range: 0V to 60V
• ±4% LED Current Accuracy
• No Top MOSFET Refresh Noise in Buck or Boost Mode
• Adjustable Frequency: 150kHz to 650kHz
• Flicker-Free Spread Spectrum for Low EMI
• Open and Short LED Protection with Fault Reporting
• AEC-Q100 Qualified for Automotive Applications

Typical applications

• High Frequency LED Lighting
• Automotive Head Lamps/Running Lamps

More information

• Datasheet
• IC product information