Maxim universal HB-LED drivers cover wide input-voltage range

Feb. 15, 2006
Date Announced: 15 Feb 2006 SUNNYVALE, CA- Maxim Integrated Products (NASDAQ: MXIM) introduces the MAX16801/MAX16802 high-brightness (HB) LED drivers with a wide input-voltage range. The MAX16801 is well suited for universal AC input (rectified 85V to 265VAC) LED drivers, while the MAX16802 is intended for DC-input-voltage LED drivers (10.8V to 24VDC or higher with external bias). The MAX16801/MAX16802 have a 262kHz fixed switching frequency and current-mode control. An external MOSFET provides high-power (over 50W) and high-efficiency (over 85%) operation, and allows for small size components which reduces system cost.Strings of HB LEDs can be driven with a wide (0 to 100%) dimming range by using PWM or linear dimming control. When the LED current requires tight regulation, designers can use the additional on-board error amplifier with a 1% accurate reference. These devices are ideal for buck, boost, SEPIC, and isolated or nonisolated flyback topologies in general lighting applications, decorative and architectural lighting, display backlighting, and other constant current-source LED applications.Both devices feature an ultra-low 45 microamp startup current, allowing the use of high-value startup resistors and low-value startup capacitors. LED driver startup is fast, while dissipation is substantially 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/MAX16802 include digital soft-start, which results in superior control of the output current rise during startup. This eliminates virtually all output current overshoots. Both devices include thermal shutdown and are available with a 50% or 75% maximum duty cycle.Rated for operation over the extended temperature range (-40 degrees Celsius to +85 degrees Celsius), the MAX16801/MAX16802 are available in a surface-mount, lead-free, 8-pin microMAX(R) package. Prices start at $0.63 (1000-up, FOB USA).** microMAX is a registered trademark of Maxim Integrated Products, Inc.

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