Hysteresis Mode AEC-Q100 LED Drivers Source 1.5A for Power Loads Up to 40W
Diodes Incorporated introduced two automotive LED drivers that boast a combination of robust performance, simplified design, and flexibility for internal and external lighting applications including fog lamps, door lamps, position lamps, and rear lamps. The AL8860Q and AL8861Q have a wide operating voltage range from 4.5V to 40V to withstand load-dump events and operate appropriately at low-cranking voltages in stop-start applications.
Using hysteretic-mode buck control simplifies the design of the feedback loop, enabling inherent stability with just four external components. Real estate is saved and the electronic bill of materials is minimized as a result of the main power MOSFET and a programmable switching frequency up to 1MHz that allows a small output inductor.
These devices can source 1.5A for powering loads up to 40W depending on the supply voltage and external components. Both drivers also support 0.3V to 2.5V analog dimming as well as high-precision PWM dimming from 1% to 100% to allow various automatic or user-adjustable brightness controls.
AL8860Q Functional Block Diagram (Click on image to enlarge)
Such flexibility facilitates uses in a wide variety of applications inside and outside the vehicle, allowing the multiple lamp types to use the same driver, thereby streamlining inventory management for manufacturing.
Comprehensive built-in protection features including short-circuit and open-LED protection as well as over-temperature shutdown, ensure reliability and safety. The AL8861Q also features a current-sense resistor and has short circuit protection.
AL8861Q Functional Block Diagram (Click on image to enlarge)
Both drivers come in the high-power density MSOP-8EP with support for analog and PWM dimming via one control pin. This control pin, with its analog dimming function, can be used for soft-start of the LED current with just one capacitor.
The AL8860Q and AL8861Q are automotive-compliant and support PPAP documents. AL8860Q and AL8861Q are qualified to AEC-Q100 Grade 1.
Features
- Wide Input Voltage Range: 4.5V to 40V
- Output Current Up to 1.5A
- Internal 40V NDMOS Switch
- Typical 5% Output Current Accuracy
- Single Pin for On/Off and Brightness Control by DC Voltage or PWM Signal
- High Efficiency (>95%)
- LED Short-Circuit Protection
- Inherent LED Open-Circuit Protection
- Over-Temperature Shutdown
- Up to 1MHz Switching Frequency
- Pb-Free MSOP-8EP Package
Pricing and Availability
Pricing starts from $0.25 for the AL8860Q and $0.27 for the AL8861Q in 1000 piece quantities.
