LEDs are the big enabler in automotive front lighting, supporting new design possibilities, energy savings and new applications like matrix or laser high beam. These trends come with the demand for flexible DC/DC driver solutions for driving LED systems up to 50 W and more � or LEDs in configurations with currents of even more than 3 A � with high efficiency. The TLD5541-1QV is the first member of Infineon�s new multitopology DC/DC controller family LITIX� Power Flex. Its synchronous DC/DC H-bridge topology is beneficial for driving high-power LEDs with maximum system efficiency (well above 90%), and a minimum number of external components. Furthermore, reduced EMC emissions are achieved thanks to the optimized spread spectrum switching frequency. With its seamless buck-boost regulation and fast dynamic load jump behavior, it is also an innovative solution for realizing cost-optimized LED headlamps with complete protection and diagnosis features � e.g. by driving two, three or more separately switched LED loads in one string, with up-to 55 V string voltage, with just one TLD5541-1QV.
Feature
- MOSFET H-Bridge with Single Inductor DC/DC Controller for high power BUCK-BOOST LED control
- Constant Current and Constant Voltage Regulation
- Wide VIN Range (IC 4.5 V to 40 V, Power 4.5 V to 55 V)
- Wide LED forward voltage Range (2V up to 55V)
- Switching Frequency Range from 200 kHz to 700 kHz
- LED current accuracy +/- 3% at TJ = 25°C and 4% over the whole automotive temperature range
- 16-bit SPI for diagnostics and control, providing daisy chain capability
- Maximum Efficiency in every condition (up to 96%)
- Drives multiple loads with a single IC thanks to the Fast Output Discharge operation
- Limp Home Function (Fail Safe Mode)
- EMC optimized device: Auto and programmable Spread Spectrum
- LED and Input current sense with dedicated monitor Outputs
- Adjustable soft start feature to limit the current peak and the voltage overshoot at start-up
- Smart power protection features for device and load (open load, short of Load, Overtemperature)
- Enhanced Dimming features: Analog and PWM dimming
- Available in a small thermally enhanced PG-VQFN-48-31 package
- Automotive AEC qualified
Applications
- Especially designed for driving high power LEDs and Laser modules in automotive applications with very high efficiency
- Ideal for driving (LED) loads on supply/battery voltage level
- Full LED headlamp assemblies e.g. LB, HB, DRL/POS with just one DC/DC
- Power supply for high power Matrix and Pixel light sources like LED or Laser modules for DMD or parallel LED arrays
- General purpose current/voltage controlled DC/DC LED driver
