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2007-03-12 Getting more out of the ZXLD1350: high output current
The ZXLD1350 is a continuous mode inductive step-down converter, designed for driving single or multiple series connected LEDs efficiently from a voltage source higher than the LED voltage. The device operates from an input supply between 7V and 30V and provides an externally adjustable output current of up to 350mA. In order to obtain higher output current to drive LEDs with higher power, a high current externally connected output stage is required.
2007-03-12 Getting more out of the ZXLD1350: dimming techniques
The ZXLD1350 has a versatile adjust pin that can be used in many ways to adjust the brightness of the LED by controlling the current in the LED. This application note deals with some the ways in which dimming the LED can be achieved and discusses the merits of the techniques. These dimming methods discussed include PWM dimming both with a low and high frequency signals, DC voltage control and resistive dimming.
2006-06-01 Small-footprint device eases high-power LED driving
Zetex's mini LED driver requires a single external resistor to set its output current, simplifying LED driving.
2008-10-16 EMC issues for hysteretic converters in LED driving
The use of LEDs in a wide range of lighting applications is rapidly increasing. In order to maximize the efficiency improvements that the LEDs offer they must be driven from switching regulators rather than power hungry linear circuits. One of the most versatile inductive switching topologies is the hysteretic converter. To ensure these converters are used effectively in a fully EMC compliant manner their limitations must be understood.
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