With the development of technology, the power of LEDs is constantly increasing, but the cost is decreasing. The use of low-cost, high-reliability drive circuits is the key to ensuring long-lasting brightness of ultra-high-brightness LEDs. According to the characteristics of high-brightness LED high-power constant-current driving, many companies have introduced dedicated driver control chips for high-brightness LEDs. These LED driver manufacturers include Melexis, lnfinton (Infineon) and LienearTechnology. SupenexInc, Analog Devices (ADI), Leadtrend, Anmo Microelectronics (AME) and more.
Compared with traditional lighting, super bright LEDs have long life, reliability and durability, and extremely low maintenance costs. The current high efficiency of LEDs can now reach more than 201m/w. Since the LED response speed is fast (ns level), installing a high-position LED brake light on the car can reduce the occurrence of a rear-end collision accident. Although super bright LEDs have many advantages, LED power is still below 5W, and it has not appeared yet. More powerful LEDs are hard to become the first choice for lighting. At the same time, we must consider the high-power LED needs to consider the heat dissipation problem. If the junction temperature is too high, it will directly affect the life of the LED, and it will increase the light decay of the LED. If the LED is burnt out, the LED will burn out. In addition to the above problems, although LED is currently favored by most people, its high price is difficult to be accepted by consumers. And having a good super bright LED can not solve all the problems. Choosing the appropriate driver chip is also conducive to the popularization and promotion of super bright LED.
It has been found in the LED industry that the use of a constant voltage source drive does not guarantee the uniformity of LED brightness and affects the reliability, lifetime and light decay of the LED. Therefore, super bright LEDs are usually driven by a constant current source. The constant current supply eliminates current changes caused by forward voltage changes. This produces a constant LED brightness regardless of the forward current. It is easy to generate a constant current power supply. It is only necessary to adjust the voltage across the current sense resistor without adjusting the output voltage of the power supply. Compared with the performance of the current main high-power IED driver control chip, when applying the high-power IED driver control chip, it can be selected according to different applications:
1. When higher power is required, the power device can be selected without the controller integrated in the chip, so that the power device can be separately selected according to the actual power requirement.
2. When a higher conversion efficiency is required, such as a portable device, a drive circuit of a switching power supply type can be selected.
3. When applied to equipment with high reliability, you can choose a chip with comprehensive control functions such as temperature protection and fault alarm.
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