The cost and power consumption of light-emitting diode (LED) driver ICs have both decreased. With ENERGY STAR and the International Telecommunications Commission (IEC) standardizing LED driver ICs must have high power factor correction (PFC) to ensure better conversion efficiency and lamp life, power chip manufacturers are fully investing in the development of related solutions; iWatt uses The patented circuit technology introduces a single-level topology into the chip and dynamically sets the PFC function, which will help lamp developers to create high-performance, non-dimmable LED lighting products at a lower cost.
Hubie Notohamiprodjo, head of product marketing for iWatt solid-state lighting (SSL), said that the biggest factor consumers are reluctant to switch to LED luminaires is cost and service life; therefore, suppliers must premise on not increasing the system bill of materials (BOM) cost, The advanced LED driver IC provides excellent PFC management and integrates functions such as overheating and overcurrent protection to overcome the problems of high price and short time for LED lamps to accelerate market penetration.
In response to this design demand, standards organizations such as Energy Star and IEC have set stricter specifications for LED power factor and total harmonic distortion (THD), which has led global power management chip manufacturers to invest in strengthening the PFC function of LED driver ICs. LED lamps have better conversion efficiency; at the same time, chip manufacturers are also actively developing single-stage topologies to reduce system component costs.
Notohamiprodjo pointed out that in order to show differentiated value, power chip manufacturers must achieve a more flexible and flexible PFC design, and a better chip cost performance. Therefore, iWatt recently used an exclusive digital circuit patent to develop a single-stage, dynamically set PFC non-dimming application LED driver IC, which can set the power factor intensity to be greater than 0.7 or greater than 0.9 according to the operating conditions, and more effectively manage The balance between the output ripple current to reduce the problem of heat dissipation and flicker; at the same time, it can also meet the domestic and commercial LED lighting specifications of various countries.
Notohamiprodjo further emphasized that the solution also uses bipolar junction transistors (BJT) to replace metal oxide semiconductor field effect transistors (MOSFET), eliminating the need for high-voltage electrolytic capacitors on the chip, which can further reduce the LED lamp 20% bill of materials (BOM) Cost and size.
In fact, chipmakers including NXP, ON Semiconductor, and Fairchild have all invested in the development of a single-stage topology that integrates high PFC functions and pulse width modulation (PWM), thereby reducing LED driver IC peripheral components usage and improve efficiency.
Although each design method has its own characteristics, Notohamiprodjo believes that the new generation of iWatt driver ICs can reduce the obstacles of LED non-dimming applications through innovative digital control methods, and can introduce high-end driver ICs with the low cost. Powerful functions will help to heat up the LED lighting market.
TECHNOLOGY
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