Diodes Incorporated has introduced a one-to-one single-phase 12V fan motor driver AH5772 and AH5773 for low to medium voltage brushless DC fan control for consumer products, household appliances, industrial and office equipment. Two highly integrated fan drivers offer miniature package options and heat treatment capabilities, saving space by reducing component count and shrinking printed circuit board size.
The new device integrates a high-sensitivity Hall sensor and a pair of input amplifiers that can be used with fan motor magnets with weak magnetic fields to save cost. The sensor provides the ideal voltage and thermal coefficient over a very wide operating range, plus minimal tolerances to help stabilize motor performance and simplify manufacturing and testing processes.
Two compact motor drivers with low on-resistance H-bridge output stages that support up to 500mA of continuous current sinking and sinking at 1A peak for larger, more complex drives and pre-driver performance . The device offers ultra-thin package options with a small pin count, including the MSOP8-EP and U-DFN2020-6 packages for the AH5773 and the TO-94 package for the AH5772.
The new fan driver offers a wide operating voltage range from 2.4V to 18V, and the low startup voltage allows the fan to operate 20% lower than the 12V rated voltage, making it suitable for a wide range of brushless DC cooling fan applications. The device's operating temperature range is -40oC to 105oC, which meets the stringent temperature requirements of the application.
The two drivers adjust the fan speed through voltage input control. The AH5773 also provides more accurate speed control by varying the duty cycle of a series of PWM signals applied to a dedicated pulse width modulation (PWM) input. When the PWM pin of the AH5773 is pulled low for more than 65ms, the device enters standby mode, typically consuming only 100μA. If the PWM pin is pulled high, the drive output will restart. This quick start function can be used in the rotor stall protection state to restart the fan motor before the end of the lockout time.
To prevent overheating or damage to the fan motor coils, the two fan drivers include a rotor stall protection function that shuts down the drive output when a rotor stall is detected and the drive automatically restarts when the rotor is unlocked. The device internally handles the lock detection, shutdown, and auto-restart times without the need for an external timing capacitor.
The AH5772 and AH5773 also integrate a comprehensive protection function such as overvoltage protection. When an overvoltage condition is detected, the device is turned off and then enters standby mode to prevent the motor coil from being pressed. The over-temperature shutdown function effectively protects the temperature of the device.
Introduction to Diodes
Diodes Incorporated, a S&P SmallCap 600 Index and Russell 3000 Index, is the world's leading manufacturer and supplier of discrete, logic and analog semiconductor products for consumer electronics and computers. , different markets such as communications, industry and automobiles. Diodes' products include diodes, rectifiers, transistors, MOSFETs, protection devices, special function arrays, single-gate logic, amplifiers and comparators, Hall effect and temperature sensors, covering LED drivers, AC-DC converters and controllers, DC- Power management devices such as DC switches and linear regulators, voltage references, and special features such as USB power switches, load switches, voltage monitors, and motor controllers.
Diodes' headquarters and US sales offices are located in Plano, Texas, USA, with designs and markets in Plano, San Jose, California, Taipei, Manchester, UK, and Neuhaus, Germany. And engineering centers; wafer fabrication facilities in Kansas City and Manchester, Missouri, and two in Shanghai; one assembly and test facility in Shanghai, Chengdu, Taipei, and Neuhaus, Germany; Engineering, sales, warehousing and logistics offices in Fort Worth, Taipei, Hong Kong, Manchester, Shanghai, Shenzhen, South Korea and Suwon, Tokyo and Munich; sales and support operations around the world At the office.
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