Product category: Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX16801 and MAX16802
Edited by the Electronicstalk Editorial Team on 17 November 2005
Bright LED drivers run from wider inputs
The MAX16801 and MAX16802 are high-brightness (HB) LED drivers with wide input-voltage ranges.
The MAX16801 and MAX16802 are high-brightness (HB) LED drivers with wide input-voltage ranges The MAX16801 is well suited for universal AC input (rectified 85 to 265V AC) LED drivers, whereas the MAX16802 is intended for DC-input-voltage LED drivers (10.8 to 24V DC or higher with external bias)
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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The MAX16801 and 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 sise 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 onboard 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 ultralow 45uA 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 and 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 to +85C), the MAX16801 and MAX16802 are available in a surface-mount, lead-free, 8-pin microMAX package.
Prices start at $0.63 (1000-up, FOB USA).
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