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Maxim > Design Support > Technical Documents > Reference Designs > Automotive > APP 4380
Maxim > Design Support > Technical Documents > Reference Designs > LED Lighting > APP 4380
Maxim > Design Support > Technical Documents > Reference Designs > Prototyping and PC-Board Layout > APP 4380
Keywords: LED Driver Linear RCL Rear Combination Lamp
REFERENCE DESIGN 4380 INCLUDES: Tested Circuit Schematic Description Test Data Layout
Reference Design for a 3S3P Rear Combination
Lamp (RCL) LED Driver
By: Jim Christensen, Strategic Applications Engineer
May 05, 2009
Abstract:
This application
note presents a reference design for a rear combination lamp (RCL) LED driver in
a 3-series, 3-parallel (3S3P) configuration. Using the MAX16823 linear driver and external BJTs, this design
provides 200mA per string as well as enhanced heat dissipation. Also included is PWM dimming circuitry for
tail-light inputs and full brightness for brake-light inputs. Double-battery and load-dump conditions have
been taken into consideration.
Overview
This reference design uses the MAX16823 3-channel linear LED driver and external BJTs to implement a
3S3P RCL driver circuit. Figures 1 and 2 present images of the PCB and attached heatsink; Figure 3
illustrates the layout of the design; and Figure 4 provides the schematic for the circuit.
The reference design is discussed in detail below, with analysis of the main circuit blocks, design
specifications, and performance data.
More detailed image (PDF, 1.89MB)
Figure 1. PCB and attached heatsink.
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