Texas Instruments TPS92761-Q1 24-Channel LED Matrix Manager
Texas Instruments TPS92761-Q1 24-Channel LED Matrix Manager includes an integrated synchronous buck regulator and protected linear current sinks. The device is capable of driving current up to 90mA through LEDs, with channel-to-channel accuracy of less than ±3.5%. Each linear current sink can be individually programmed with a 6-bit current setting and independently controlled via pulse width modulation (PWM) using 14-bit registers. Transient behavior is improved by programming uniform phase-shifted PWM signals between operating channels.
The LEDs can be powered by the voltage rail generated by the wide 5V to 36V input voltage range integrated synchronous buck regulator. The buck regulator implements adaptive off-time current-mode control, enabling operation at low input voltages. The device is capable of providing 2.68A at 2.1MHz switching frequency and 4A at 400kHz switching frequency, with a fast transient response. Dynamic headroom control is implemented to optimize system efficiency and reduce thermal dissipation.
The Texas Instruments TPS92761-Q1 features an internal oscillator that supports multidrop, universal asynchronous receiver transmitter (UART) serial interface. The internal EEPROM can store system defaults as well as calibration and lighting module data. An on-board ADC with multiplexed inputs samples all LED channels as well as IC die temperature and supply voltages.
Features
- AEC-Q100 qualified for automotive applications with Grade 1 -40°C to +125°C ambient operating temperature
- Functional safety targeted
- Developed for functional safety applications
- Documentation to aid ISO26262 system design up to ASIL B
- 24 constant current sinks with high precision
- 20V maximum voltage capability
- Up to 90mA channel current set by a resistor
- Low dropout voltage: 400mV (typ.) at 90mA
- Flexible dimming control
- 6-bit independent current setting
- 14-bit independent PWM dimming with phase-shift control
- Programmable slew-rate control
- Integrated synchronous buck regulator
- Wide input voltage range: 5V to 36V
- Supports 400kHz and 2.1MHz switching frequency
- Spread spectrum frequency modulation
- Dynamic headroom voltage control (DHC)
- UART serial communication
- Support for up to 2MHz clock frequency
- Internal oscillator for system clock
- CAN transceiver compatible
- Internal EEPROM
- Failsafe default settings
- Customer calibration data
- Extensive fault diagnostics
Applications
- Automotive exterior headlight and rear light
- Tail, stop, and sequential (dynamic) turn indicator
- Ambient lighting, grill illumination, and dashboard lighting functions
Simplified Schematic
