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LED drivers with wide input-voltage range

Posted: 16 Nov 2005 ?? ?Print Version ?Bookmark and Share

Keywords:maxim integrated products? max16801? max16802? led driver?

Maxim Integrated Products introduced the MAX16801 and MAX16802 high-brightness (HB) LED drivers with a wide input-voltage range. The MAX16801 is designed for universal AC input (rectified 85V to 265Vac) LED drivers, while the MAX16802 is targeted at DC-input-voltage LED drivers (10.8V to 24Vdc or higher with external bias).

Both the MAX16801 and MAX16802 have a 262kHz fixed switching frequency and current-mode control. The external MOSFET provides high-power (over 50W) and high-efficiency (over 85 percent) operation, and allows for small size components which reduces system cost. In addition, these new products feature an ultra-low 455A startup current, allowing the use of high-value startup resistors and low-value startup capacitors. LED driver startup is fast, while dissipation is reduced. An input voltage undervoltage lockout (UVLO) allows setting of the input start voltage with an external resistor-divider. Pulling the UVLO pin low shuts down the devices.

The MAX16801 and MAX16802 LED drivers include digital soft-start, which results in superior control of the output current rise during startup. Maxim added that this eliminates virtually all output current overshoots. Both devices include thermal shutdown and are available with a 50 or 75 percent maximum duty cycle.

Rated for operation over the extended temperature range (-400C to 80C), the MAX16801 and MAX16802 are available in a surface-mount, Pb-free, 8-pin microMAX package. Prices start at 63 cents (1,000-up, FOB USA).

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