Requirements of LED lamp beads for low-voltage driver chips
1. The nominal output current of the driver chip is required to be greater than 1.2-1.5A. As the LED lamp beads for lighting, the operating current of the LED lamp beads with a power of 1W is 350mA, and the operating current of the LED lamp beads with a power of 3W is 700mA. Therefore, the driver IC selected for LED lamp bead lighting must have a satisfactory current output. When planning the product, the driver IC must operate in the optimal operating area of 70-90% of the full negative output.
2. The output current of the driver chip must be stable for a long time, so that the LED lamp beads can emit light steadily, and the brightness will not shine; the same batch of driver chips are used under the same conditions, and the output current should be as consistent as possible, that is, the discreteness should be small. In this way, the production can be effective and orderly on a large-scale automated production line; the driver chip with a certain discreteness in the output current must be selected before leaving the factory or put into the production line, and adjust the resistance of the current setting resistance (Rs) on the PCB board. The size of the LED lamp bead constant current driver board produced by it makes the luminous brightness of the same type of LED lamp bead the same.
3. The input voltage range of the driver chip should meet DC8-40V to cover the needs of the application surface. It is better if the withstand voltage can be greater than 45V; the simple bridge rectifier output voltage will fluctuate with the grid voltage when AC12V or 24V is input, especially When the voltage is high, the output DC voltage will also be high. If the driver IC cannot adapt to the wide voltage range, it will often be broken down when the grid voltage increases, and the LED lamp beads will also be burned.
4. The ability of the driver chip itself to resist EMI, noise, and high voltage is also related to whether the entire LED lamp bead product can pass CE, UL and other certifications smoothly. Therefore, the driver chip itself must choose excellent topology and high voltage at the beginning of planning. production process.
5. The packaging of the driver chip is conducive to the rapid heat dissipation of the driver chip die. The experimental process is briefly described here. 6. The power consumption of the driver chip itself is required to be less than 0.5W, and the switching frequency is required to be greater than 120Hz to avoid visible glare caused by power frequency interference. LED lamp bead green lighting promotes the development of driver chips towards innovative design. LED lamp bead lighting is inseparable from driver chips, so LED lamp bead driver ICs with multiple functions are required.
If the AC power supply below 36V is used for LED lamp beads, non-blocking power supply can be considered. If the AC power supply of 220V and 100V is selected, blocking power supply should be considered.
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