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News

Step Down Convertor For Driving LED Strings

Linear Technology : 08 July, 2010  (New Product)
The LT3596 from Linear Technology is a step-down DC/DC converter enabling high ratio constant dimming in strings of LED lights
Step Down Convertor For Driving LED Strings
Linear Technology announces the LT3596, a 60V, 1MHz step-down DC/DC converter designed to operate as a constant current LED driver for up to 30 LEDs. From a 48V input, the LT3596 can drive up to three strings of LEDs, each with up to ten 100mA LEDs in series, delivering efficiencies of over 90%. The LT3596s multichannel capability makes it ideal for LED billboards as well as industrial and medical displays. Its input voltage range of 6V to 60V makes it well suited for automotive and industrial applications. The LT3596 offers + 1.5% LED current matching to insure uniform display brightness and True Color PWM dimming offers dimming ratios as high as 10,000:1. A programmable 200kHz to 1MHz fixed frequency operation and current-mode architecture ensures stable operation over a wide range of supply and output voltages, minimizing the size of external components. Additionally, the switching frequency is synchronizable to an external clock. The LT3956s thermally enhanced 5mm x 8mm QFN package provides a highly compact solution footprint for LED backlighting applications.

The LT3596 uses a single 800mA, 60V internal switch to provide a step-down constant current source. The internal buck converter uses an adaptive feedback loop to regulate the output voltage slightly higher than the required LED voltage to ensure maximum efficiency. If any of the LED strings experience an open or short-circuit, it will continue to regulate the other strings and signal the FAULT pin. Additional features include LED current de-rating based on junction temperature and/or LED temperature and LED disconnect in shutdown.

The LT3596EUHG is available in a 39-lead 5mm x 8mm QFN package. Pricing starts at $3.65 each in 1,000-piece quantities. An industrial grade version, the LT3596IUHG is tested and guaranteed to operate from a -40C to 125C operating junction temperature and is priced at $4.29 each in 1,000-piece quantities.
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