The new "24V DC Cooling Fan" drive offers from a wide 2.4V to 18V operating voltage range, combined with low starting voltage allows the fan to work at 20% lower than 12V rated voltage, for a variety of brushless DC "24V DC Cooling Fan"applications. Device operating temperature range of -40oC to 105oC, and thus be able to meet the stringent requirements of the temperature of the application. Both drive duty cycle by controlling the voltage input to regulate "24V DC Cooling Fan" speed, AH5773 also by changing the pulse width is applied to special modulation (PWM) input a series PWM signal to provide more accurate speed control.