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Thermal Management in Notebooks

Need for Thermal Management. Total system power up to 35W in Y2k ... Fan speed optimized for given CPU temperature while minimizing audible noise and ...

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Thermal Management in Notebooks

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    1. Thermal Management in Notebooks John Blake Product Development Manager Temperature and System Monitoring Products Analog Devices Inc Limerick, Ireland February 15-17, 2000

    7. Temperature Errors due to variation of ideality factor n

    8. Temperature Errors due to variation of b

    11. Thermal Profile - ADM1021/23

    14. Fan Speed Control Methods Fan Speed Control Fan On/Off - no speed control; only S/W temp. control Linear speed control has narrow range; PWM = wide range Automatic Fan Speed Control Programmable operating limits Fan speed set by CPU temperature (closed loop control) Fan speed optimized for given CPU temperature while minimizing audible noise and battery power drain RPM Control Mode allows use of Fans with wide tolerance Fan speed optimized by OS for given temperature while minimizing audible noise and battery power drain

    20. ACPI - Cooling Methods Passive Cooling ( Silent Mode ) OS controls CPU temperature and power by throttling CPU clock Reduces temperature by reducing performance Active Cooling (Performance Mode) OS or ASIC controls a fan to cool the CPU Highest performance design methodology but requires fan power to reduce system heat

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