LEDs & Light Sources
Diodes Announces Constant Current DC-DC LED Driver with Low Standby Power Mode
Diodes Incorporated has introduced the AL8860 hysteresis mode DC-DC step-down converter, which is designed for driving single or multiple series connected LEDs efficiently from a voltage source higher than the LED voltage. With its integrated MOSFET, this product provides a low BOM cost solution…
Operating from an input supply between 4.5 V and 40 V, the AL8860 can directly source a 1 A output current in the TSOT25 package, or up to 1.5 A in the more thermally efficient MSOP8-EP package. Contingent on the supply voltage and other external components, the AL8860 is capable of providing up to 40 watts of output power.
In addition to the internal 40 V 0.2 Ohm NDMOS power switch, the device integrates a high side output current sensing circuit that allows the use of a single external resistor to set the nominal average output current. Deep dimming (0% to 100%) can be applied via a CTRL pin using either a DC voltage or a PWM signal. The same pin also implements soft-start operation, with the time adjusted by an external capacitor. Applying a voltage of 0.2 V or less to this pin will turn off the output and cause the device to enter a power-saving standby state.
The AL8860 includes protection against LED short and open circuits, and over-temperature to ensure reliable system operation. Offered in either the 5-pin TSOT25 package or 8-pin MSOP8 EP package the AL8860 is priced at $0.15 and $0.18 each respectively in 1000 piece quantities.
Further information is available at www.diodes.com
