In the past 5 years, the changes in the LED market have provided new growth points for industry players, such as NXP. In the past few years, the company has focused on the indoor professional lighting and high-end consumer markets, such as residential and hotels, these markets are willing to spend a higher cost to enjoy advanced lighting experience, so the dimmable LED lighting market once became NXP LED Drive the main direction of IC, and become the dominant player in this market.
But this situation is changing. NXP Semiconductors Greater China Marketing Director Wang Yongbin said that due to the rapid price drop, more applications began to use LED lighting, including offices, outdoor, industrial, shopping malls, entertainment, medical and automotive. Therefore, NXP is also focusing on the development of non-dimming LED driver chips.
At present, NXP's main dimming chip is SSL2101 / 2/3, and the new-generation products are SSL21082 / 4 and SSL2129A, optimized for dimmer compatibility and efficiency; non-dimmable chips are mainly SSL21081 / 3 , SSL2109 and SSL21151 / 3. Wang Yongbin believes that compared with previous years, the LED lamp market in 2013 will have a higher growth, which also provides new opportunities for NXP that has been committed to bulb lamps. SSL4101 and SSL4120 are NXP ’s high-power LEDs. Scheme of lamps.
For LED driver management chips, efficiency is a key indicator. NXP Semiconductors Greater China Lighting Product Marketing Manager Zhang Weichao said that NXP ’s products have been approved by many Chinese government tender projects. China's relevant standards stipulate that the PF (power factor) value of LED drivers should be above 0.9, while European Energy Star has no requirements except for 5W or less, PF> 0.7 is required for 5W or more, and PF> 0.9 is required for 25W or more. The higher the PF, the less the harmonic interference to the power grid and the smaller the energy loss. If you rely on external circuits to increase the PF value, this approach will increase costs. NXP achieves a high PF value inside the chip. "There are not many chips on the market that can achieve PF" 0.7, "said Zhang Weichao." NXP has integrated MOSFETs in its driver chip below 15W, PF> 0.7, but no PF with built-in MOSFET "0.9."
As mentioned above, SSL21081 / 83 (A) and SSL2109 (A) are the flagship products of NXP's non-dimming LED driver chips that support non-isolated topologies. Among them, SSL21081 / 83 (A) has built-in 300V / 600V MOSFET, which can control the LED current accuracy within 3%, its power conversion efficiency is as high as 95% or more, and has built-in complete protection functions, including LED realized by NTC temperature sensor The temperature protection function requires only 14 PCB board components; SSL2109 (A) is a control chip without built-in MOSFET, the power conversion efficiency is also 95%, and the same built-in protection function, only 15 PCB board components.
SSL21082 / 84 (A) and SSL2129A are the main products of NXP dimmable non-isolated LED driver chips. Among them, SSL21082 / 84 (A) has built-in 300V / 600V MOSFETs, and their PF> 0.9. SSL2129A is a control chip without built-in MOSFET. It can be used in both non-isolated and isolated topologies. It is designed for 4W ~ 25W improved lamps, PF》 0.9. As the efficiency of LEDs (lumens per watt) has been steadily increasing, the input power required to improve LED lamps has been steadily decreasing. At present, LED lamps for commercial use are 7W instead of 40W incandescent lamps and 8.7W instead of 60W incandescent lamps. Below 10W, maintaining the compatibility of the dimmer becomes extremely difficult. To solve this problem, NXP has developed a "per-watt compatibility" scoring method, which will absorb the mains input power consumption and stability (the ability to avoid visual interference such as flicker, low light flicker and flash) and controllable. Performance (users can control and reduce the degree of light output, including the dimming range of the lighting level, control room and steps) and other indicators composed of compatibility are taken into consideration. The SSL2129A provides best-in-class dimming performance measured on the basis of compatibility per watt, and is used in single-stage mainstream LED driver applications.
In terms of high-power LED lighting solutions, SSL4101 is a flyback controller with integrated PFC, and the adaptable power range is 25W ~ 150W. The newly launched SSL4120 is designed for high-power LED applications from 75W to 400W. It also integrates the GreenChip half-bridge resonant controller of PFC, which can support high-power LED applications up to 400W. The chip fully supports mains applications and supports direct startup from the rectified general mains voltage within the range of 90V ~ 305V, with total harmonic distortion (THD) of less than 10%, PF》 0.97, PFC frequency of 380kHz, resonant topology And the bottom / zero voltage switching efficiency exceeds 93%, which meets and exceeds the traditional requirements of high-power LED lighting applications. The chip integrates a variety of protections, including OCP, OVP, degaussing detection, open circuit protection, capacitive mode protection, and general blocking protection input, etc., reducing BOM cost.
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