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2MHz LED driver suits compact apps

Posted: 18 Feb 2009 ?? ?Print Version ?Bookmark and Share

Keywords:driver LED 2MHz? applications compact? buck driver LED?

A new buck (step-down) LED driver from Allegro MicroSystems Inc. uses constant on-time with valley current-mode control, a scheme that allows the use of very short switch on-times.

Dubbed A6210, Allegro's LED driver is aimed at applications that require high switching frequencies combined with high input voltages and low output voltages. Its small size and high efficiency make it suitable for compact applications such as inside small MR16 lamps, while its high current and medium voltage capability serves high-power applications such as street lighting.

System cost is reduced through high switching frequencies of up to 2MHz, allowing small, low-value inductors and capacitors. In addition, few external components are required through high levels of integration, including a 3A switch. Optimal drive circuits minimize switching losses, allowing over 90 percent efficiency in realistic conditions. The switching frequency is maintained constant, as the input voltage modulates the ontime. An external resistor pulled-up to the input supply programs the on-time.

Allegro's A6210 is supplied in a 4mm QFN package and is now available. Its pricing is $0.76 in 1,000 quantities.

- Ismini Scouras

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