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LED combinations for backlighting options

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FAIRCHILD Semiconductor, represented by Arrow Electronics , is addressing emerging display application trends by offering combinations of low VF LEDs and low dropout LED driver ICs for backlighting options.

Fairchild’s family of LEDs, in conjunction with complementary LED driver ICs, give designers a full range of matching and brightness control in portable applications.

Fairchild’s low-voltage blue LEDs run directly from the battery (no boost required), ultimately reducing part-count and cost.

The control, efficiency and price benefits associated with this unique LED/LED driver IC solution leads to backlighting innovations.

The selection of LEDs is a key decision for achieving the optimal price-performance point in the design of display sub-systems.

With expertise in both LEDs and LED driver ICs, Fairchild offers designers the freedom to match an array of LED products in a variety of popular backlighting colours, including white, pink, blue and amber, to their driver ICs.

This combination of parts assures precise brightness matching and enables the use of a range of LEDs from matched, binned LEDs to unmatched LEDs.

Fairchild’s QTLP6XX series of low VF, surface mount LEDs, feature low voltage operation for low power consumption and a narrow forward voltage range for enhanced colour and brightness consistency.

These LEDs have advantages over conventional cold-cathode fluorescent lamps and electroluminscent lamps for illumination in compact devices.

In addition to being small and reliable, Fairchild’s LEDs use dc voltage to simplify designs by not requiring auxiliary circuitry.

Working in tandem with its LED products is Fairchild’s family of FAN56XX LED driver ICs, offering a variety of drive options (driving two to four LEDs).

With their built-in actively-matched current sources (within plus/minus 3%), these directly driven LED driver ICs eliminate the need for external current matching resistors to reach up to 97.5% efficiency.

These products accommodate a full range of architectures from serial and parallel to matrix configurations.

Fairchild’s driver ICs use active matching techniques for close tracking and constant brightness. Built-in digital, analogue and PWM control facilitates brightness adjustment and helps minimise current draw to increase battery life.

The driver ICs also allow the LEDs’ current to be programmed with a single external resistor and provide the highest current matching for narrow band spectrum LEDs.

Because they use either minimal or no external components and come in small (SC-70 and 2X2 MLP) packaging, these products fulfil the smallest PCB area requirements.

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