Allegro Microsystems introduces 36 V, 4 A Low-EMI Synchronous Buck LED Driver Module with PWM Monitor for DMS Applications. The APM80905 is a 36 V, 4 A, ASIL-B, low EMI, synchronous buck switching regulator module that provides a regulated current output to drive high-power infrared or standard LEDs. The module integrates both the high-side and low-side N-channel MOSFET switches and high-frequency input voltage and boot capacitors. The APM80905 also includes several fault protection features including a PWM dimming signal monitor with configurable LED on-time and duty cycle limits to simplify the design of Driver Monitoring Systems.
The switching frequency is programmable from 400 kHz to 2.2 MHz with an external resistor. Output current is programmable by an external current sense resistor, and the output voltage is automatically adjusted to drive one or multiple LEDs in series, optimizing system efficiency regardless of the number of LEDs in the string. The analog dimming input, ADIM, allows for LED current calibration or thermal foldback with an external NTC thermistor. An open-drain fault flag pin FFn is pulled low to alert the system or controller a fault has been detected.
The APM80905 is offered in a compact, thermally enhanced 4 x 4 x 2 mm QFN package with wettable flanks.
Key features
- Automotive ASIL-B, AEC-Q100 qualified solution for infrared LED Driver Monitoring System (DMS)
- Ultra-low EMI architecture with integrated EMI mitigation capacitors and spread spectrum operation to comply with Automotive requirements.
- Safety protection against out-of-range PWM on-time and duty cycle with PWM monitoring feature for Eye-Safe operation, as well as several other ASIL Safety measures.
- High integration architecture including high-side and low-side MOSFET switches and a 5V peripheral LDO to reduce solution size and cost.
Key applications
- Driver Monitoring Systems
- ADAS Lighting Systems
- Instrument Clusters
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