The LT8391A 2MHz, 60V buck-boost LED driver controller powers LED strings in automotive headlights. Its features include its low EMI 4-switch architecture and spread spectrum frequency modulation for meeting CISPR 25 Class 5 EMI requirements. The unique, high switching frequency allows it to operate above the AM band, requiring very little EMI filtering. Its small size and versatility enable use in headlight cluster LED strings of a variety of voltages and currents.
About the author: Keith Szolusha is LED Drivers Applications Manager, Analog Devices Inc.
All images (C) Analog Devices.