Allegro Microsystems APM80904 | Demoboard APM80904 Evaluation Module

Description

The APM80900 and APM80904 are complete synchronous buck switching regulator ClearPower modules that provide constant current for driving high-power LEDs. They integrate both high-side and low-side switches along with the inductor, the input capacitor, and the boot capacitor. Current regulation is achieved on a cycle-by-cycle methodology that utilizes varying the on-time.The maximum output current is easily adapted to the application with the use of an external current sense resistor. The output voltage automatically adjusts to the match the total Vf of the LED string. This ensures the optimal system efficiency. LED dimming is accomplished by a direct logic input pulse width modulation (PWM) signal.

Features

• Source current up to 1.5 A for high current LEDs
• Integrated inductor and capacitors
• Capable of Driving 1 to 6 series WLEDs (APM80900)
• Peak Efficiency of 90%
• Ultra-low EMI signature
• High frequency (fSW > 2 MHz) switching with a Spread spectrum
• Synchronous rectification with integrated high-side and low-side MOSFETs
• High side current source, ILED accuracy ±3%
• Dimming via external PMW or EN Pin - Programmable internal PWM dinning (APM80904) - Analog dimming for brightness calibration and thermal foldback
• FAULT flag output
• Small solution footprint (140mm2)

Typical applications

• Automotive Lighting, Industrial Lighting, Architectural Lighting
• Medical Instruments