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Optoelectronics/Displays  

2.1MHz converter designed as triple output LED driver

Posted: 04 Jan 2010     Print Version  Bookmark and Share

Keywords:converter  LED driver  PWM dimming 

LT3492 LED driver

Linear Technology Corp debuts the LT3492 a 2.1MHz DC/DC converter, designed as a triple output constant current LED driver where each of it's three channels can drive up to ten 300mA LEDs in series, enabling it to drive up to 30 x 300mA LEDs at efficiencies up to 96%. All three channels are operated by an independent True Colour PWM signal, enabling each to be dimmed independently to ratios as high as 3,000:1.

A fixed frequency, current mode architecture ensures stable operation over a wide range of supply and output voltages. A frequency adjust pin enables the user to program the frequency between 330kHz and 2.1MHz to optimise efficiency while minimising external component size. The LT3492's thermally enhanced 4mm x 5mm QFN (or thermally enhanced TSSOP) package provides a highly compact solution footprint for up to 50W LED applications.

The LT3492 senses output current at the high side of the LED, enabling buck, buck-boost or boost configurations. With an external sense resistor, the user can program the output current range of each channel. Each of the three independent driver channels utilises an internal 600mA, 60V NPN switch and has a built-in gate driver for PMOS disconnect. Other features include open LED protection and thermal limiting.

The LT3492EUFD is available in a thermally enhanced 28-lead 4mm x 5mm QFN package, and the LT3492EFE is available in a thermally enhanced TSSOP-28 package. Pricing starts at Rs. 172.94 ($3.70) and Rs. 179.96 ($3.85) each, respectively in 1,000 piece quantities. Industrial grade versions, the LT3492IUFD and LT3492IFE, are tested and guaranteed to operate from -40�C to 125�C operating junction temperature and are priced at Rs. 203.33 ($4.35) and Rs. 211.74 ($4.53) each, respectively in 1,000 piece quantities. All versions are available from stock.





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