DLP391TPFSB datasheet(32/46 Pages) TI2

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7.2.1 Design Requirements

Other core components of the display system include an illumination source, an optical engine for the

illumination and projection optics, other electrical and mechanical components, and software. The type of

illumination used and the desired brightness have a major effect on the overall system design and size.

The display system uses the DLP391TP as the core imaging device and contains a 0.39" array of micromirrors.

The DLPC8445V controller is the digital interface between the DMD and the rest of the system, taking digital

input from the front-end receiver and driving the DMD over a high-speed interface. The DLPA3085 / DLPA3082

PMIC serves as a voltage regulator for the DMD, controller, and LED illumination functionality.

7.2.2 Detailed Design Procedure

For a complete DLP system, an optical module or light engine is required that contains the DLP391TP DMD,

associated illumination sources, optical elements, and necessary mechanical components.

For reliable operation, use the DMD with the DLPC8445V display controller and the DLPA3085 / DLPA3082

PMIC driver.

7.2.3 Application Curve

The typical LED-current-to-luminance relationship when LED illumination is used is shown in Figure 7-2.

LED CURRENT (A)

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

D001

Figure 7-2. Luminance vs Current

7.3 Temperature Sensor Diode

The software application provides functions to configure the TMP411 to read the DLP391TP DMD temperature

sensor diode. Use this data to incorporate additional functionality in the overall system design, such as adjusting

illumination, fan speeds, and so on. All communication between the TMP411 and the DLPC8445V controller is

completed using the I2C interface. The TMP411 connects to the DMD through the pins outlined in Section 4.

DLP391TP

DLPS289A – JUNE 2025 – REVISED SEPTEMBER 2025

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DLP391TPFSB Datasheet(PDF) 32 Page - Texas Instruments