Product category: Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX16804
Edited by the Electronicstalk Editorial Team on 25 August 2006
Bright driver dims to save power
A high-brightness LED driver comes with a high-voltage PWM pin that allows a wide dimming range.
The MAX16804 is a 350mA high-brightness LED driver with a high-voltage (40V) PWM pin that allows a wide dimming range A wide operating input-voltage range of 5.5 to 40V helps protect against large transients such as load-dump and cold cranking
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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Among others, these features make the MAX16804 is ideal for automotive, LED industrial, and architectural lighting applications.
An onboard 200Hz ramp generator allows analogue or PWM control for PWM or theatre-dimming effect, thus eliminating the need for the microcontroller's PWM signal.
The high-voltage (40V-rated) DIM pin can also sync with an external PWM signal up to 2kHz.
Fast turn-on/off times ensure a wide dimming range, while the wave-shaping circuitry minimises EMI.
A fixed, 5V-output regulator delivers up to 2mA of load current for low-power applications throughout the 5.5 to 40V input-voltage range.
For greater design flexibility, the regulator can also power a microcontroller or other external components.
The regulator stays on even when dim is pulled low.
The MAX16804 regulator combines a low-voltage (204mV) current-sense reference with differential LED current sensing to provide load accuracy of +/-3.5%.
This current accuracy allows consistent brightness for all light assemblies.
The device's low-dropout pass element (0.5V typical) and current-sense reference minimise power dissipation in the system.
They can drive multiple LEDs in series up to 39V.
The need for only two small ceramic capacitors and a small sense resistor results in minimal board size and driver cost.
The MAX16804 features thermal and short-circuit protection and is rated for operation over the automotive temperature range (-40 to +125C).
It is available in a thermally enhanced, surface-mount, 5 x 5mm, 20-pin TQFN lead-free package rated at 2.67W power dissipation (MAX16804).
Pricing starts at $1.31 (1000-up, FOB USA).
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