DLPS039F December 2015 – April 2019 TPS99000-Q1
The illumination control function includes all blocks needed to generate light for the DLP subsystem. The system is designed to support automotive applications requiring precise control of color and brightness over a wide dimming range. The complete dimming solution consists of hardware features included in both the DLPC230-Q1 and TPS99000-Q1 along with DMD sequence data stored in the DLPC230-Q1. These elements work together to provide a usable system dimming range of over 5000:1, with up to 8 bits per color supported.
The illumination control function operates in two distinct modes to cover the full dimming range. These modes are referred to as continuous mode (CM) and discontinuous mode (DM).
Continuous mode features:
Discontinuous mode features:
The illumination control loop regulates current supplied to the LEDs through a real-time photo feedback control loop. A broadband photodiode is placed in the illumination path of the DLP subsystem in a location that receives light from all three red/green/blue LEDs. For continuous mode operation, photo feedback is used to create a real-time hysteretic control loop to set the brightness levels for each LED. In discontinuous mode, photo feedback is used to set a peak brightness threshold for each light pulse.
To support illumination control, the TPS99000-Q1 includes numerous high performance analog and mixed signal blocks. These blocks include: