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HB LED driver simplifies green lighting designs

Posted: 22 Dec 2008 ?? ?Print Version ?Bookmark and Share

Keywords:HB LED driver? high-brightness LED? green lighting?

MDM PCB connector

Maxim Integrated Products has developed the MAX16834, a current-mode, high-brightness (HB) LED driver for boost, buck-boost, SEPIC and high-side buck topologies.

This device is designed to reduce the size, complexity, and cost of solid-state lighting designs such as MR16 spotlights, thus simplifying the implementation of green lighting technology. The driver integrates a high-side, current-sense amplifier; a PWM-dimming MOSFET driver; and robust protection circuitry. Providing the efficiency and thermal-management capabilities critical to LED system designs, the MAX16834 is suitable for applications such as LED automotive exterior lighting, LCD backlighting and architectural lighting.

The MAX16834's feature set enables the implementation of boost or buck-boost DC/DC converters with minimal external components. In addition to driving an n-channel power MOSFET by the switching controller, the MAX16834 drives an n-channel PWM-dimming switch to achieve a wide, 3000:1 PWM-dimming range. To further enhance design flexibility, the device offers analog dimming that allows the LED current to be controlled by an external DC voltage. The built-in, high-voltage current-sense amplifier and up to 1MHz switching frequency allow designs to be optimized in terms of efficiency and size.

In addition, the MAX16834 integrates protection circuitry to ensure reliable operation in rugged environments. The driver provides analog thermal-foldback protection to allow the use of an external thermistor to reduce the LED current when the temperature of the LED string exceeds a specified temperature point. It also includes a fault-output flag for overvoltage, overcurrent and thermal warning faults, while its programmable, true-differential overvoltage protection meets stringent automotive requirements for LED lighting and display backlighting.

MAX16834 features a solution that provides > 92percent input power factor correction without the need for an additional PFC controller. This feature, together with thermal-foldback protection and low cost, makes this HB LED driver suitable for MR16 spotlights and similar applications powered from AC voltage sources.

This LED driver is fully specified over the -40C to +125C automotive temperature range and is available in a thermally enhanced, 4mm x 4mm, 20-pin TQFN package with exposed paddle. Prices start at $1.24 (1,000-up, FOB USA).

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