This reference design is used for LED backlight driver of 12-inch TFT display. Input electrical requirements and output characteristics are as follows:
V IN (power supply):
16V (1092mA) to 36V (476mA); withstands 50V transients
V BIAS：
3.3V (50mA)
PWM IN :
250Hz pulse train; 1µs (minimum) pulse; greater than 3.1V at 0mA; less than 0.3V at 10mA
V LED configuration:
8 LEDs (2.9V to 3.75V) in series (31V, maximum); 8 series in parallel, each string can reach 70mA
Detailed image (PDF, 51.64kB)
Figure 1. MAX16809 driver circuit board
Detailed picture (PDF, 14.83kB)
Figure 2. Driver design schematic diagram
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