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.

Figure 1. PCB and attached heatsink.


Figure 2. Side view of the attached heatsink.
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Figure 3. Layout of the LED driver.


Figure 4. Schematic of the LED driver

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