Diodes motor drives make the cooling system more sensitive

August 18, 2025

Diodes Incorporated has launched the AM4964 motor driver, a high-performance solution designed to control fan speed and optimize cooling systems for personal computers, servers, and industrial equipment. This device utilizes pulse width modulation (PWM) input signals and a thermistor to dynamically adjust fan speed based on temperature conditions, ensuring efficient and responsive thermal management. The AM4964 is a single-phase full-wave brushless DC motor driver that delivers peak currents of up to 1A at a 12V supply voltage. It automatically adjusts motor speed between low and high temperature settings, responding in real-time to ambient temperature changes and PWM inputs. This makes it ideal for applications where precise temperature control is essential. The driver offers flexible configuration options, allowing users to easily adjust the setpoint and maximum PWM output using just three external resistors. It provides both speed output (FG) and operational output (RD), along with a bias output for differential unbuffered Hall sensors. Additionally, it features dedicated inputs for three- or four-pin Hall sensors, enabling accurate rotor position detection for improved motor performance. Housed in a compact TSSOP-20EP package, the AM4964 includes an internal oscillator, eliminating the need for external capacitors. It also features a minimum speed setting circuit and adjustable alpha slope technology, which allows for customization of different speed profiles. To protect the motor coil from damage, the driver incorporates thermal shutdown, rotor stall detection, and automatic restart functionality. For more details about the AM4964 and other products from Diodes Incorporated, visit their official website. This innovative motor driver is a reliable choice for engineers looking to enhance cooling efficiency while maintaining system reliability and performance.

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