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TDK Product Information NEWS Vol.026　October 2018
 
TDK Corporation delivers monthly product information to you.
 
 
Topics
 
  • The application note "How to Use NTC Thermistors for Inrush Current Limiting" has been released
  • The application note "How to use PTC limit temperature sensors" has been released
  • The application note "How to use PTC thermistors as current protection" has been released
 
The application note "How to Use NTC Thermistors for Inrush Current Limiting" has been released
 

At the time of powering on an electronic device such as a switch-mode power supply (SMPS) or an inverter, the device is charged with an instantaneous abnormal current with a high peak. It is called an inrush current, and without protection, it may destroy a semiconductor device or have a harmful effect on the service life of a smoothing capacitor. NTC thermistors are used as ICLs (inrush current limiters) to protect circuits of electrical and electronic devices against inrush currents easily and effectively.

》How to Use NTC Thermistors for Inrush Current Limiting
 
The application note "How to use PTC limit temperature sensors" has been released
 

PTC thermistors have the property that their resistance rises significantly when a certain temperature is exceeded. This property makes them suitable for use as temperature protection devices that detect defined high temperatures to protect circuits from overheating.
TDK offers various types of PTC limit temperature sensors and motor protection sensors that incorporate PTC thermistors and serve as temperature protection devices. This article describes typical applications of such sensors.

》How to use PTC limit temperature sensors
 
The application note "How to use PTC thermistors as current protection" has been released
 

One of the properties of PTC thermistors is that when an excessively large current flows, they generate heat by themselves and become highly resistive. With this property, they are used as overcurrent protection devices.
This article describes applications for the following purposes.
« For inrush current limiting »
« For overcurrent protection »
« For telecom »

》How to use PTC thermistors as current protection