NTC Thermistor for Circuit Board
Applicable circuit board: single layer, double layer
Installation method: DIP, SMT
Application fields: electronic appliances that can use the negative temperature characteristics of NTC
Applicable steady-state current range: Iss0.3A～20A
Internal electrode: Ag or Cu
Description
Technical Parameters
Product Description:
Scenes To Be Used
1. The switching power supply scheme is more common.
2. There is an isolation transformer in the circuit board
3. AC conversion to DC is more common
Common problems in use
High-efficiency conversion (AC-DC) requires a price, such as: EMC problems. Start-up inrush current problem. Under the condition of high voltage and high current, the key components with high value are prone to frequent damage and early failure, which makes the entire power system scrapped. This is a headache for circuit designers, especially power supply design engineers.
Why does the hazard occur
1. More than 60% of electrical equipment problems are in the power system.
2. In practice, it has been shown that due to the existence of pulse capacitors, any switching power supply will generate a surge current at the moment of starting up, and the higher the load of the power supply, the greater the power, and the greater the surge current. Practice has also proved that the surge current can be 20 to 100 times the normal working current of the power supply!
Solution
Engineers designed slow start, delay insurance and other means to avoid some failures, but they cannot be completely eliminated. Practice has proved that connecting NTC thermistors in series is an economical and effective method.
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