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PTCSC17T141DBE Datasheet(PDF) 3 Page - Vishay Siliconix |
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PTCSC17T141DBE Datasheet(HTML) 3 Page - Vishay Siliconix |
3 / 4 page PTCSC17 www.vishay.com Vishay BCcomponents Revision: 08-Dec-15 3 Document Number: 29017 For technical questions, contact: nlr@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 APPLICATION SPECIFIC DATA Negative Temperature Coefficient (NTC) thermistors are well known for temperature sensing. What is not well known, however, is that Positive Temperature Coefficient (PTC) thermistors can be used for thermal protection. Although their operating principles are similar, the applications are very different; whereas NTC thermistors sense and measure temperature over a defined range, PTC thermistors switch at one particular temperature. Just like thermostats they protect such equipment and components as motors, transformers, power transistors and thyristors against over temperature. A PTC thermistor is less expensive than a thermostat, and its switch temperature can be more accurately specified. It is also smaller and easier to design-in to electronic circuitry. The PTC thermistor is mounted in thermal contact with the equipment to be protected, and connected into the bridge arm of a comparator circuit, such as shown in Fig. 1. At normal temperature, the PTC thermistor resistance ( Rp) is lower than Rs (see Fig. 2), so the comparator’s output voltage V0 will be low. If an equipment over temperature occurs, the PTC thermistor will quickly heat up to its trigger or nominal reference temperature Tn, whereupon its resistance will increase to a value much higher than Rs, causing V0 to switch to a high level sufficient to activate an alarm, relay or power shutdown circuit. APPLICATION EXAMPLES Fig. 1 - Typical comparator circuit Fig. 2 - Typical switch characteristic Fig. 3 - Temperature Protection of 3-phase electric motor PTC thermistor R p R L R f R s R1 R2 + V O Trigger temperature T n V O T (°C) R p > Rs (R1 = R2) R p < Rs (R1 = R2) + θ + θ + θ As soon as one or more of the windings becomes too hot, the motor is switched off. |
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