Circuit protects system from overheating


Posted on May 15, 2012

The two-chip circuit in Figure 1 provides fan control and overtemperature warning and shutdown signals to protect systems from excessive heat. The circuit monitors the temperature of the pc board and the die temperature of a CPU, an FPGA, or another IC with an on-chip temperature-sensing transistor. IC1 is a temperature detector and fan driver for cooling fans with nominal operation of 250 mA.



At low temperatures, the cooling fan is off, minimizing noise and fan wear. When the system temperature increases to more than 45°C, IC1`s factory-programmed temperature comparator causes the fan-drive pin to go active, pulling the fan`s lowe




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