Analog Devices Inc. LT8391 Synchronous Buck-Boost LED Controllers
Analog Devices Inc. LT8391 Controllers are 4-switch synchronous, buck-boost LED controllers. The controllers regulate output voltage, input, or output current from an input voltage above, below, or equal to the output voltage. The peak-buck/peak-boost current mode control scheme enables adjustable and synchronizable 150kHz to 650kHz fixed-frequency operation. The control scheme also allows internal ±15% triangle spread spectrum frequency modulation for low EMI.
Analog Devices Inc. LT8391 Controllers offer 4V to 60V input, 0V to 60V output voltage capability, and seamless low-noise transitions between operation regions The controllers are ideal for LED driver and battery and charger applications in automotive, industrial, telecom, and even battery-powered systems.
Features
- 4-switch single inductor architecture aAllows VIN
- Above, below, or equal to VOUT
- Up to 98% efficiency synchronous switching
- Proprietary peak-buck peak-boost current mode
- 4V to 60V VIN range
- 0V to 60V (51V LED) VOUT range
- ±3% LED current accuracy
- 2000:1 external and 128:1 internal PWM dimming
- High-side PMOS PWM switch driver
- Integrated bootstrap diodes
- No top MOSFET refresh noise in buck or boost
- 150kHz to 650kHz adjustable and synchronizable
- Flicker-free spread spectrum for low EMI
- Open and short LED protection with fault reporting
- Available in 28-lead TSSOP with exposed pad and 28-lead QFN (4mm × 5mm)
Applications
- Automotive head lamps/running lamps
- High-power LED lighting
Development Tools
Analog Devices Inc. DC2575A Demo for LT8391 Buck-Boost LED Controller
Demonstration Circuit for the LT8391 60V 4-Switch Buck-Boost LED Controller with Spread Spectrum.
Analog Devices Inc. LT8391D Evaluation Board (EVAL-LT8391D-AZ)
Reference design for a buck-boost LED driver circuit based on the LT8391D LED Controller.
LT8391 Typical Application
Publicado: 2017-04-28
| Atualizado: 2022-09-15