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Posistor-Slide9

The right figure shows two examples: circuit A uses single PRF and circuit B uses the multiple PRFs in series. Both circuits achieve the same result, since thermistors (as shown in circuit B) can be run in series with one control circuit. When one PRF reaches beyond the sensing temperature, Vout goes over the same threshold (1.06V) in both the circuit A and the circuit B. If these PRFs were placed at many potential hot spots on the PCB and connected in series, just one interface circuit would be needed to achieve a total thermal management solution.

PTM Published on: 2011-11-02