TLD5541-1QV
The TLD5541-1QV is a synchronous MOSFET H-Bridge DC-DC controller with built in protection features and SPI interface
This concept of a synchronous and seamless buck-boost regulation provides a very efficient solution for circuits where the output (load) voltage is on the same level as the input voltage, e.g. in short chains with 2 to 3 high power LEDs or laser diodes connected to a 12 V electrical system.
Furthermore in combination with its 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.
Summary of Features
- 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
Potential 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
