DLPC3479 datasheet(43/61 Pages) TI1

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DLPC3479

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DLPS112 – JUNE 2018

Product Folder Links: DLPC3479

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Typical Application (continued)

9.2.1 Design Requirements

A high accuracy 3D depth capture product is created by using a DLP chipset comprised of DLP4710 DMD,

2xDLPC3479 controller and DLPA3000 PMIC/LED drive. The DLPC3479 simplifies the pattern generation, the

DLPA300 provides the needed analog functions and DMD displays the required patterns for accurate 3D depth

capture. In addition to the three DLP devices in the chipset, other components may be required to complete the

application. Minimally, a flash component is required to store patterns, the software, and the firmware in order to

control the DLPC3479 controller. DLPC3479 controller supports any illumination source including IR light source

(LEDs or VCSEL), UV light source or visible light source (Red, Green or Blue LEDs or lasers).

I2C should be connected to the host processor for sending commands to the DLPC3479. The only power

supplies needed external to the projector are the battery (SYSPWR) and a regulated 1.8-V supply. A single

signal (PROJ_ON) controls the entire DLP system power. When PROJ_ON is high, the DLP system turns on and

when PROJ_ON is low, the DLPC3479 turns off and draws only a few microamperes of current on SYSPWR.

When PROJ_ON is low, the 1.8-V power supply can remain at 1.8 V for use by other sub systems. When

PROJ_ON is low, the DLPA3000 draws no current on the 1.8-V supply.

9.2.2 Detailed Design Procedure

For connecting together the DLP4710 (.47 1080p) DMD, the 2xDLPC3479 controller, and the DLPA3000 or

DLPA3005 device PMIC/LED driver, see the reference design schematic. When a circuit board layout is created

from this schematic, a very small circuit board is possible. An example small board layout is included in the

reference design data base. Follow the layout guidelines to achieve a reliable system.

9.2.3 Application Curve

As the LED currents that are driven time-sequentially through the red, green, and blue LEDs are increased, the

brightness of the projector increases. This increase is somewhat non-linear, and the curve for typical white

screen lumens changes with LED currents is shown in Figure 24 when using the DLPA3000 or DLPA3005

device . For the LED currents shown, it is assumed that the same current amplitude is applied to the red, green,

and blue LEDs.

Figure 24. Luminance vs Current

DLPC3479 Datasheet(PDF) 43 Page - Texas Instruments

DLPC3479 Datasheet(HTML) 43 Page - Texas Instruments

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