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Analog Devices Inc. EVAL-LT8277-AZ Evaluation Board is a dual-phase nonsynchronous high-power step-up converter featuring the LT8277 Multiphase Step-Up DC-DC Controllers. The board regulates the output voltage up to 60V and drives up to a 3A load at 60V when the VIN is between 9V and 36V. EVAL-LT8277-AZ runs at a 200kHz switching frequency with the ability to turn on Spread Spectrum Frequency Modulation (SSFM) for reduced EMI emission. It can run with or without SPI communications. Multiple EVAL-LT8277-AZ boards can be paralleled to deliver more output power. A graphic user interface (GUI) is available when connected to a DC2026C Linduino One demo circuit.
The EVALLT8277-AZ enables users to quickly evaluate LT8277’s features, like the SPI interface, PGOOD output status reporting, frequency synchronization, clock output for 4- or 8-phase operation, and more. Users could change the RT resistor to set the circuit’s switching frequency, change ENABLE resistors to set the minimum input voltage when the circuit starts operation, and change VC pin components to adjust loop compensation.
With SPI control, EVAL-LT8277-AZ can set the output voltage from 9V to 60V in 0.5V steps. The SPI interface also configures on/off of the clock output (CLKOUT pin), clock output phase shift, speed of soft start, and keep/drop phase two at light load conditions. The MODE pin controls the SPI interface’s watchdog timer, and the JP3 jumper sets the MODE pin voltage or enables GUI control of the MODE pin.
The EVAL-LT8277-AZ features an input EMI filter for low emissions. The inductor current is sensed by sensing resistors, while DCR sensing is available. Power-stage MOSFETs and diodes are optimized to achieve high efficiency. The PCB has large copper planes and extensive vias for excellent high-power thermal performance.
