资 源 简 介
The ISL97801 is a high-power LED backlight driver with anintegrated 36V FET designed to drive up to 8 high-powerLEDs in series. The PWM converter runs from an internallygenerated 1MHz clock. With efficiencies over 90% theregulator provides TIght control of LED current and may beconfigured in either boost or buck topologies, allowing from 3to 8 series diodes to be driven from wide input voltages.LED light level may be controlled either by:1. LED DC bias current set via the LEVEL pin, or2. External low frequency PWM control via theENABLE/PWM pin.In both control modes opTIonal over temperature thermalprotecTIon of the LED reduces the LED DC bias currentabove an adjustable set temperature, protecTIng the LEDfrom thermal damage. An optional fault monitor drives anexternal FET between the input supply and inductor,providing short circuit current protection for the LED andinductor as well as load dump protection for automotiveapplications. For low cost applications the pass transistormay be omitted and the fault pin bypassed.
