EVAL-LT8355-1-AZ

EVAL-LT8355-1-AZ evaluation board is a high voltage dual LED controller featuring the LT8355-1. Channel 1 is assembled as a boost LED driver and channel 2 as a buck-boost mode LED driver. Either channel can be altered to a boost LED driver or buck-boost mode LED driver by adjusting the FB network and LED connection. EVAL-LT8355-1-AZ drives a single string of LEDs per channel when the input is between 8V and 18V. Channel 1 drives up to 72V of LEDs at 450mA and channel 2 drives up to 30V of LEDs at 1A. EVAL-LT8355-1-AZ has an UVLO set at 6.2V falling and 7.5V rising. EVAL-LT8355-1-AZ features PWM dimming, analogue dimming, shutdown, open LED and short LED fault protection and reporting. EVAL-LT8355-1-AZ runs at 250kHz switching frequency and features spread spectrum frequency modulation (SSFM) modulating its switching frequency from 250kHz to 310kHz to reduce EMI emissions.

• mall ceramic input and output capacitors are used to save space and cost
• High voltage 100V external power switch and 100V catch diode are used on each channel
• Input and output filters on EVAL-LT8355-1-AZ help further reduce its EMI
• LT8355-1’s integrated PWMTG high-side PMOS drivers assist with PWM dimming of the connected LEDs