Texas Instruments TPS92519-Q1 Synchronous Buck LED Driver
Texas Instruments TPS92519-Q1 Synchronous Buck LED Driver is a monolithic dual synchronous buck LED driver with a wide 4.5V to 65V operating input voltage range. The device can independently power two strings of series-connected LEDs. The TPS92519-Q1 implements an adaptive on-time average current mode control and is designed to be compatible with shunt FET dimming techniques and LED matrix manager-based dynamic beam headlamps. The adaptive on-time control provides a near-constant switching frequency that can be set using FSET input. Inductor current sensing and closed-loop feedback enables better than ±4% accuracy over wide input voltage, output voltage, and ambient temperature range.
The high-performance LED driver can independently modulate the LED current using analog or PWM dimming techniques. The linear analog dimming response over the 16:1 range is obtained by varying the voltage from 140mV to 2.45V across the high Impedance Analog Adjust (IADJ) input. PWM dimming of LED current is achieved by directly modulating the corresponding UDIM input pin with the desired duty cycle and frequency. The device supports high-frequency shunt FET dimming and is compatible with pixel control techniques using an LED matrix manager.
The TPS92519-Q1 supports the parallel operation of two or more channels, thus enabling the flexibility required to drive high current LEDs or laser diodes. Current is shared between parallel channels based on IADJ input independent of component tolerances and parasitics. The TPS92519-Q1 incorporates advanced fault protection featuring: cycle-by-cycle switch current limit, bootstrap undervoltage, and thermal shutdown. The device includes an open drain fault output to indicate output open and short conditions. The Texas Instruments TPS92519-Q1 is available in an 8.1mm × 11mm thermally-enhanced 32-pin HTSSOP package with a 2.75mm × 3.45mm bottom-exposed pad.
Features
- AEC-Q100 qualified for automotive applications
- –40°C to 125°C ambient operating temperature Grade 1
- Device HBM classification level H1C
- Device CDM classification level C2
- Functional Safety-Capable
- Documentation available to aid functional safety system design
- 4.5V to 65V wide input voltage range
- Up to 2A output current with 4% accuracy
- Adaptive on-time average current control
- Nominal switching frequency
- 385kHz and 435kHz for channel 1 and channel 2
- 2MHz and 2.1MHz for channel 1 and channel 2
- Advanced dimming operation
- Precision analog dimming
- Supports external PWM dimming input
- Optimized for external shunt dimming, including LED matrix manager
- Cycle-by-cycle switch overcurrent protection
- Switch thermal protection
- LED open and short fault monitoring and reporting
Applications
- Automotive headlights
- Adaptive LED driving modules
Simplified Schematic
Related Development Tool
Texas Instruments TPS92519EVM-169 Driver Evaluation Module (EVM)
Evaluation module that features the TPS92519-Q1, an automotive 2A dual synchronous buck LED driver.