TLD5191ES
TLD5191ES - a synchronous MOSFET H-Bridge DC-DC controller with built-in protection features
The TLD5191ES is a synchronous MOSFET H-Bridge DC-DC controller with built-in protection features. This concept is beneficial for driving high power LEDs with maximum system efficiency and minimum number of external components. The TLD5191ES offers analog and digital (PWM) dimming and embedded PWM engine. The switching frequency is adjustable in the range of 200 kHz to 700 kHz. A built-in spread spectrum switching frequency modulation and the forced continuous current regulation mode improve the overall EMC behavior. Furthermore, the current mode regulation scheme provides a stable regulation loop maintained by small external compensation components. The adjustable soft start feature limits the current peak as well as voltage overshoot at start-up. The TLD5191ES is suitable for use in the automotive environment and in industrial and consumer applications as well (e.g. wireless charging).
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 (Device 4.5V to 40V, power stage 4.5V to 55V)
- Wide LED forward voltage range (2V up to 55V)
- LED current accuracy+/-3% at Tj=25° and 4% over the whole automotive temperature range
- Switching frequency range from 200 kHz to 700 kHz
- Maximum efficiency in every condition (up to 96%)
- EMC optimized device: spread spectrum always active
- Overvoltage, shorted LED fault and overtemperature diagnostic outputs
- Adjustable soft start
- Enhanced dimming features: analog and PWM dimming (from digital input or sourced by embedded PWM engine)
- Available in a small thermally enhanced TSDSO-24 package
- Automotive AEC Qualified
Benefits
- Enable compact design due to high efficiency
- Reduced EMI emissions
- Easy diagnosis of the load due to reliable protections
Potential Applications
- Especially designed for driving high power LEDs in automotive applications
- Automotive exterior lighting: full LED headlamp assemblies (low beam, high beam, matrix beam, pixel light)
- Voltage pre-regulator for rear lamp assemblies
- General purpose DC-DC for constant current or constant voltage applications as USB, mobile wireless charger and multipurpose pre-regulation for infotainment
