SMARC T335x Carrier Board Hardware Design Guide, Document Revision 1.2
2.4.3.2. LCD WLED Backlight Reference Schematic
WLED driver IC utilizes the inductor/Schottky diode pumping method,
incorporating a feedback system to monitor output current. Driver output
frequency can be from 0.5 - 3 MHz and efficiencies are up to 92%,
depending on usage. The driver IC handles the DC to DC conversion, and
these ICs typically include an input for a PWM dimming signal. Dimming is
achieved by varying the duty cycle of the PWM. The example here uses TI
TPS 61165 and is ideal for media form factor display.
The
LCD_BLKT_PWM
signal could be used for brightness control.
Figure 19: LCD WLED Backlight Reference Schematic
2.4.4. Unused Parallel RGB Interface Signals Termination
If unused pin is not driven to a valid logic level, then an external connection
to GND is recommended.
