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High precision 4x400mA LED driver

Supplier News
article image Integrates four independent current sinks per chip.

AUSTRIAMICROSYSTEMS, a leading designer and manufacturer of high performance analogue ICs, has extended its LED driver family with the addition of the AS3691. Austriamicrosystems is represented in Australia by Adilam Electronics Pty Ltd .

The device is a 4x400mA LED driver, specially designed for the fast-growing high and ultra high brightness LED application market.

"The strong growth in high-brightness LED applications, for example, in general lighting or for LCD monitor backlighting, are currently served by universal LED driver ICs leading to suboptimal solutions," said senior VP and general manager of the communications business unit at austriamicrosystems, Alexander Harrer.

"The AS3691 is ideally suited for white and colour high brightness LED applications since it supports very high currents, and delivers outstanding accuracy with great flexibility and efficiency, while being very simple to use."

The AS3691 includes four independent high precision current sinks each capable of sinking 400mA.

The operating current per LED channel can be set easily via an external resistor, while the LED brightness is controlled by four independent pulse width modulated inputs.

The AS3691 integrates four independent current sinks per chip, enabling it to drive either four white LEDs each sinking 400mA or a single white LED with up to 1.6A.

"The ICs absolute current accuracy of 0.5% allows for highly accurate brightness settings and is thus ideal for support sophisticated colour management applications like LCD monitors with RGB backlighting," explained marketing manager for power and lighting management at austriamicrosystems,” Ronald Tingl.

"With four independent current sinks available, the AS3691 offers great flexibility in combining various colour LED settings, such as RGGB or RGBA strings.

“The current sinks have a wide voltage compliance range of 15V and special internal circuitry allows for very high LED supply voltages that are limited only by the maximum power dissipation allowed for the entire application."

The AS3691's linear driver avoids issues typical of inductive boosters, like EMI, or flickering images that are particularly critical in LCD monitor applications.

To optimise the application's power efficiency, each channel includes a feedback output enabling simple adjustment of one or more external power supplies and allowing overall power dissipation to be kept to a minimum.

The AS3691 is available in a small QFN4x4 package or as a die-only solution.

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