APPLICATION NOTE 4576

Protect LED Driver in Backlit Displays

By: Massimo Caprioli

Abstract: Several circuit ideas are presented for protecting a boost-converter LED driver when the LEDs are disconnected. (Without protection, the driver output can destroy the external MOSFET and Schottky diode.) An LED-driver IC (MAX1698) and comparator (MAX9060 or MAX9028) are included.