PTC Thermistor for time delay of electronic ballast RoHS manufacturer

Specifications

Features:

• High reliability
• Safe and stable
• Frequent switching
• Withstanding voltage can reach 600-1000VAC
• Switching current over 100,000 times
• Resistance will not float

Application:

• Energy Saving lamps
• Fluorescent electronic ballasts
• Digital multi-meters

Dimentions:

• Straight
• Kinked
• K-lead
• Custom-made

Application Principle:

The application of the PTC thermistor to achieve preheated start is as follows: Immediately after power is switched on, Rptc is in normal temperature state and it's resistance is far lower than the C2 resistance. The Current through C1and Pptc forms a return circuit to preheat the filament. After about 0.4--2second, Rptc joule heat temperature exceeds Curie point Tsc and skips into high resistance state of far higher than C2 resistance. The current passes through C1 and C2 to form a return circuit, which causes L resonance and produces high voltage to light the fluorescent tube. To a certain electronic ballast, energy saving light, higher PTC thermistor resistance, smaller PTC ceramic body dimension, lower switch termperature, will lead to its lower power consumption, and shorter preheating time, conversely, large power consumption, and longer preheating time.