Dimmable buck LED driver simplifies LED lighting design
The device is a hysteretic driver with an integrated power switch and operates at a switching frequency of 1 MHz.
The AL8807B’s 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.
By packaging the driver in a small footprint, low thermal-resistance MSOP-8EP package, a higher power density is achieved, maximizing the permissible LED current over a wider ambient temperature range. The AL8807B delivers an LED drive current up to 1.3 A and operates between -40°C to +125°C with an efficiency of 96%.
From voltage sources between 6 V and 36 V, the driver will produce a constant current for a chain of high-brightness LEDs. Average LED current accuracy is better than 5%, helping to improve channel-to-channel matching and while meeting the requirements of most medium-voltage LED lighting products.
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