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With the continuous development of LED technology, domestic LED applications are also maturing, from the lights, lights, displays, landscape lighting, broaden to indoor and outdoor lighting, warm reminder, the use of LED products, pay attention to the LED power supply and driver Circuit protection.

As the LED power supply and drive circuit vulnerable to over-impulse and short-circuit fault damage, so in the drive circuit design should take full account of various fault protection measures to improve the reliability of the circuit, thereby reducing the repair rate.

While many high-end LED drivers are gradually integrating overcurrent and overheat protection, in many cases, especially overheating protection, there is still a need for a discrete component solution as a synergistic protection scheme to make the lamp more reliable and more Long life.

PPTC refers to the positive temperature polymer thermistor, is composed of polymer and conductive particles, etc., after special processing, the conductive particles in the polymer constitute a chain conductive path. When the normal operating current through (or components at normal ambient temperature), PPTC was low resistance state. When the abnormal current in the circuit passes (or the ambient temperature rises), the heat generated by high current (or ambient temperature) causes the polymer to rapidly expand and cut off the conductive path formed by the conductive particles. The PPTC is in high impedance status. When the circuit overcurrent (over-temperature condition) ruled out, the polymer cooling, the volume returned to normal, in which the conductive particles and re-constitute the conductive path, PPTC was the initial state of low resistance. PPTC small size, low cost, can be used repeatedly to achieve the automatic start circuit protection and automatic recovery.