Inrush Current Limiting Power NTC Thermistors For Switch Mode Power Supply

Inrush Current Limiting Power NTC Thermistors For Switch Mode Power Supply

Quick Detail:

·Low cost solid state device for inrush current supression.
·Minimise line current distortion and radio noise.
·Protect switches, rectifier diodes and smoothing capacitors against premature failures. 
·Prevent fuse from blowing in error.

Description:

Power NTC thermistor can be a cost effective device to limit the amount of inrush current in a switching power supply or other devices when the power is first turned on. Power NTC thermistor limits surge current by functioning as a power resistor which drops from a high cold resistance to a low hot resistance when heated by the current flowing through it. 
Inrush-current limiters power NTC thermistor protect circuits from undesirably high currents, suppressing high inrush current surges, while its resistance remains negligible low during continuous operation. Thanks to their low resistance in the operating state, Power thermistor have a considerably lower power dissipation than the fixed resistors frequently used for this application.

Applications:

Limiting surge current, suitable for the protection of switch mode power supply, UPS power, transformers, motors, various electric heating utensil, energy saving lights, ballast, various power circuit, amplifiers, colored displayer, monitors, color TV, filament protection, etc.
Power thermistor components can also be used for the soft starting of motors, for example in vacuum cleaners with continuous currents of up to 20 A.

Specifications:

Inrush Current Limiting Power NTC Thermistor Features:

·Resin coated disk thermistor with uninsulated lead-wires.
·Suitable for both AC and DC circuits up to a voltage of 265 V(rms). 
·Wide range of resistance, current and dimension. 
·Excellent mechanical strength. 
·Suitable for PCB mounting.

Typical Application of Inrush Current Limiting Power NTC thermistors for Circuit Protection

Basic circuit diagram NTC thermistor for diode protection

Possible locations of NTC Thermistors inrush current limiters

Typical power supply circuit

Power NTC thermistors application circuits

Another example NTC Thermistor for inrush current protection circuit

Inrush Current Limiting Power NTC Thermistors Dimensions (mm)

Inrush Current Limiting Power NTC Thermistors Data Sheet

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Inrush Current Limiting Power NTC Thermistors For Switch Mode Power Supply