Roma push Triac dimming LED lighting dedicated driver IC

For the sake of energy-saving effect of light emitting diode (LED) lighting to replace the traditional lighting lamps (white light / fluorescent lamp, etc.) the trend of rapid spread. Rohm semiconductor (Rohm) embarked on the development of LED lighting dedicated driver IC--BD555AKFV. To allow the LED to be fixed in the light of the conditions of light, it must be installed with constant current control LED driver IC. In general, if the use of alternating current (AC) power supply for constant current control, usually using step-down switching regulator.

The switching power supply, although the industry for the higher degree of concern and digital power supply control, but generally will use digital signal processing (DSP), so there is still a "circuit is too large (high cost)" and "excessive consumption" and other issues, so we should use the LED lighting is still very small is not easy. Rom's BD555AKFV system with LED lighting as the main function, the development of dedicated logic IC, and eliminate the shortcomings of digital power control, which is the circuit / power consumption issues.

In order to solve this problem, Rom LED lighting and traditional lighting fixtures used with each other with the dimmer. The dimming mode adopted by the traditional light modulator using bidirectional silicon controlled rectifier (Triac) and other switching elements to cut part of the AC input voltage, and the phase angle to adjust the brightness, so it is called "the Triac dimmer".

Bidirectional silicon controlled rectifier (Triac) ON, the Triac dimmer must keep the current (Holding Current) continue to pass, so keep the current down, it will cause a bidirectional silicon controlled rectifier OFF. Compared to traditional lighting, LED lighting power consumption is very low, so once the bidirectional silicon controlled rectifier (Triac) to maintain the current is reduced, it will cause dimmer OFF, and thus the emergence of Flicker. In order to avoid this situation, it is necessary to ensure that the current can be stabilized by the current regulator (Breeder) circuit, the various manufacturers of circuit structures in different ways. The BD555AKFV is equipped with the Roma original discharge circuit to avoid the unnecessary loss of current. In addition, in order to solve the sudden ringing phenomenon, Roma also through digital control to prevent the occurrence of flicker.

Rom offers the most suitable for a variety of LED lighting LED driver IC solutions, hoping to make a contribution to the popularization of LED lighting. In addition to digital power technology and dimming technology, the future will use more diverse technology, according to a wide range of uses, the introduction of built-in power factor improvement circuit and other products for customers to choose.