F71869A
Figure 10 Linear mode fan control illustration-1
a. Once the temperature is lower than 40°C, the lowest fan speed keeps in the 50% PWM duty
b. Once the temperature becomes higher than 40°C, 50°C and 60°C, the fan speed will vary from
50% to 80% PWM duty linearly with the tempreature variation. The temp.-fan speed monitoring
flash interval is 1sec.
c. Once the temperature goes over 70°C, the fan speed will directly increase to 100% PWM duty
(full speed).
d. If set the hysteresis is 5°C (default is 4°C), once the temperature becomes lower than 65°C
(instead of 70°C), the fan speed will reduce from 100% PWM duty and decrease linearly with the
temperature.
B. Linear auto mode (RPM%)
Set the temperature as 70°C, 60°C, 50°C, 40°C and the corresponding fan speed is 6,000 rpm,
4,800 rpm, 4,200 rpm, 3,600 rpm and 3,000 rpm (assume the Max Fan Speed is 6,000 rpm).
31
Oct., 2011
V0.19P
FINTEK [ FEATURE INTEGRATION TECHNOLOGY INC. ]
