This reference design is aimed at a 6A step-down LED driver for portable projectors. The reference design is based on the PWM HB LED driver MAX16821. This circuit can drive one LED; three MAX16821s are required to drive RGB three-color LEDs.
Input voltage range (V IN ): 10V to 15V
Output voltage (V LED ): 4.5V to 6V
Output current (I LED ): 1.5A to 6A, can be controlled by analog
Analog control voltage: 1.1V to 2.8V, corresponding to 1.5A to 6A
Maximum LED conduction duty cycle: 50%
Maximum LED current rise/fall time: < 1µs
Maximum LED current ripple: < 15% at 6A
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