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Dimming driver drives up to nine LEDs from a 36V source

Posted: 10 Jun 2014 ?? ?Print Version ?Bookmark and Share

Keywords:LED? buck? driver? Diodes? dim?

Diodes Inc. launched a dimmable LED buck driver that can drive up to nine LEDs in series from a voltage source of 6V to 36V. The series connection provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors.

The AL8807B enables a reduction in component count and PCB size in 12V and 24V LED lighting systems and MR16-type LED lamps. It is a hysteretic driver integrating a power switch that operates at up to 1MHz with controlled rise and fall times to reduce EMI.

The output current is set using a single external sense resistor and dimming is achieved by applying a fast digital PWM signal to the driver's control input. A low voltage, applied to the same input, turns the output power switch off. Lamp reliability is ensured by the driver's built-in, over-temperature, LED open-circuit and short-circuit protection features.

The driver is housed in a low thermal-resistance MSOP-8EP package, which helps to maximise the permissible LED current over a wider ambient temperature range. It delivers an LED drive current up to 1.3A and operates between -40C to 125C with an efficiency of 96 per cent.

AL8807B block diagram

The AL8807B claims an accuracy better than five per cent. Dimming is achieved by applying a PWM signal at the CTRL input pin. Source: Diodes

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