Intel QX9770 Design Guidelines - Page 102
E.2.1.2, Minimum PWM Duty Cycle, Tdiode, Tcontrol
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Figure 61. Temperature Range = 10 °C Legacy Fan Speed Control RPM Tdiode (C) Fan RPM 3500 3000 2500 2000 1500 1000 500 0 Tdiode Tcontrol Time (s) Tlow 80 75 70 65 60 55 50 45 40 It should be noted that having TSENSOR above TCONTROL is expected for workloads near TDP power levels and high system ambient. See Section E.4 for additional discussion on TCONTROL versus Thermal Profile For use with the ATX Boxed Processor enabled reference solution a TRANGE value of 10°C is recommended. For BTX Boxed Processor enabled reference solutions TRANGE value of 7 °C is recommended. E.2.1.2 Minimum PWM Duty Cycle The final step in determining the FSC setting is to determine the minimum PWM Duty cycle. This is the fan speed for any TSENSOR < TLOW. The selection of this value is dependent on • Acoustic target at system idle • Voltage regulator cooling For a motherboard design intending to use the Boxed Processor or the enabled reference thermal solution the recommended minimum PWM duty cycle is 20%. Note: Set minimum PWM Duty Cycle only as low as required to meet acoustic requirements. The FSC design needs to accommodate transition from a low power state to TDP workloads without having PROCHOT# becoming active. 102 Thermal and Mechanical Design Guidelines