下载
Maxim > Design Support > Technical Documents > Reference Designs > LED Lighting > APP 4381
Maxim > Design Support > Technical Documents > Reference Designs > Power-Supply Circuits > APP 4381
Keywords: MR-16, MAX16820, white LED, hysteretic, general lighting, LED driver reference design
REFERENCE DESIGN 4381 INCLUDES: Tested Circuit Schematic BOM Description Layout
MR-16 LED Driver with a 5V Auxiliary Output to
Power a Pulsating LED Cooler
By: Jim Christensen, Strategic Applications Engineer
Jun 29, 2009
Abstract:
This application
note presents a reference design for a 4S1P MR-16 LED driver that provides
750mA to a string of four white LEDs (WLEDs). The circuit operates from a 24V source and is based around
the MAX16820 hysteretic LED driver. Also included is a MAX5033 24V-to-5V, 150mA switching power supply
to power a Nuventix® pulsating LED cooler.
Overview
This reference design details a driver circuit using the MAX16820 hysteretic LED driver for a 4-LED MR-16
lamp with an associated power source (MAX5033) for a pulsed air cooler.
The following are the electrical input requirements and output capabilities.
V
IN
: 24V
DC
±5%
Temperature: +80°C (max) ambient
V
LED
configuration: 4 LEDs in series (16V
DC
, max), 750mA
Auxiliary output power: 5V at 150mA (average), 300mA (peak)
The reference design is discussed in detail below, with analysis of the main circuit blocks and layout
considerations.
Page 1 of 4
