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AM4964GTR-G1 Datasheet(PDF) 10 Page - Diodes Incorporated |
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AM4964GTR-G1 Datasheet(HTML) 10 Page - Diodes Incorporated |
10 / 21 page AM4964 Document number: DS37241 Rev. 2 - 2 10 of 21 www.diodes.com June 2014 © Diodes Incorporated AM4964 A Product Line of Diodes Incorporated Functional Descriptions (cont.) RADJ – Adjust the Line Slope of the Input PWM Duty vs. Output PWM Duty at the OUT1 and OUT2 Adjust Slope K of the fan rotating speed (or output duty)vs. input duty to approximately match the target specification using R5 and R6. Output PWM Duty Slope K vs. Input PWM Duty with Slope K R5 and R6 VMIN – Minimum Speed Setting A voltage can be set on this pin via a potential divider between the VREF (or Supply) and GND pins. This voltage is monitored by the PWM pin to clamp the PWM control voltage so that it does not rise above VMIN voltage. As a higher voltage on the PWM pin represents a lower speed, the VMIN setting prevents the motor speed going lower than the minimum speed set by the VMIN pin. When the VMIN voltage is higher than the lowest speed setting voltage allowed (The lowest speed voltage is about 0.28VCC), the fan speed is maintained at the lowest speed. Adjust the minimum speed vs. input duty to approximately match the target specification via R2 (R1=15k Ω). Measure the fan rotating speed and the input duty, as shown below. 0 1 2 3 4 5 6 7 8 9 10 0 20 40 60 80 100 R2 (K) Output PWM Duty vs. R2 0 10 20 30 40 50 60 70 80 90 100 0 20 40 60 80 100 R5=100K R5=270K R5 is open Input Duty (%) 0 20 40 60 80 100 0 20 40 60 80 100 R6=100K R6=270K R6 open Input Duty (%) |
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