Diodes Incorporated AL8866Q Buck-Boost, Boost, Buck & SEPIC Converter
Diodes Incorporated AL8866Q Buck-Boost, Boost, Buck, and SEPIC Converter is developed to drive an external MOSFET for high-power automotive LED applications. The AL8866Q provides a 4.7V to 85V wide input power supply range. The device implements a fixed-frequency, peak current-mode control architecture to merge a spread-spectrum frequency modulation technique and reach a low EMI performance. The Buck-Boost, Boost, Buck, and SEPIC (single-ended primary-inductance converter) DC-Switching controller regulates LED current with analog or PWM dimming methods. Analog dimming response with over 100:1 Linear range is acquired by varying the voltage at the DIM pin.
The Diodes Incorporated AL8866Q uses an open drain fault output and displays protection conditions triggered, such as LED output overvoltage, LED output open/short, cycle-by-cycle overcurrent protection, sense resistor and inductor/diode shorted, diode open, and thermal shutdown.
Features
- AEC-Q100 (Grade 1)
- Wide input voltage range from 4.7V to 85V
- Pre-fixed 400kHz switching frequency (factory set)
- Spread spectrum frequency modulation for low EMI
- 1% to 100% Analog dimming range
- 100% Dimming level ±3% current accuracy
- 20% Dimming level ±12% current accuracy
- PWM dimming ratio 100:1 at 200Hz PWM frequency
- Programmable soft start
- Fault status indicator for protections
- Output overvoltage and LED open circuit protection
- Output undervoltage and LED short circuit protection
- Cycle-by-cycle over current limitation protection
- Sense resistor shorted circuit protection
- Diode/inductor shorted circuit protection
- Diode open circuit protection
- Thermal shutdown
- Totally lead-free and fully RoHS compliant
- Halogen and antimony-free “green” device
Applications
- Automotive front lightings
- Automotive high beams, low beams
- Automotive daytime running lights
- Automotive fog lights, turn lights, and position lights
- Other automotive LED lighting
Pin Assignments
Typical Applications Circuits
Dev Tools
Diodes Incorporated LED Lighting Development Tools
Provide a simple, cost-effective solution to drive low-current and high-brightness LEDs.
Đã phát hành: 2024-11-26
| Đã cập nhật: 2025-10-10