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Led luminaires for low voltage driver chips

Innotech Innotech 2018-09-11 14:03:48
1. The nominal input voltage range of the driver chip should meet DC 8~40v to cover a wide range of application needs. The pressure resistance is preferably greater than 45v. When the input is AC 12v or 24v, the output voltage of the simple bridge rectifier will fluctuate with the grid voltage, especially when the voltage is high, the output DC voltage will also be high. If the driver ic does not have a wide input voltage range, it will often be broken down when the grid voltage rises, thus burning the led light source.

2. The nominal output current requirement of the driver chip is greater than 1.2~1.5a. As a LED light source for illumination, the nominal operating current of a 1w power LED light source is 350ma, and the nominal operating current of a 3w power LED light source is 700ma. The LED light source with high power needs more current. Therefore, the driving ic selected by the LED lighting fixture must have sufficient current output. When designing the product, the driving ic must also work in the optimal working area of ??70~90% of the full load output. The drive ic using the full load output current is not well cooled in the narrow space of the luminaire, which may easily lead to fatigue and early failure of the luminaire.

3. The output current of the driver chip must be kept constant so that the LED can illuminate stably without flickering. The same batch of driver chips are used under the same conditions, and the output current should be as uniform as possible, that is, the dispersion is small, so that the production and the order can be ensured in the production of large-volume automated production lines. For the driver chip with a certain discrete output current, it is necessary to select the bin before the factory or put into the production line, adjust the resistance value of the current setting resistor on the pcb board, so that the led lamp constant current driving board is similar to the led The brightness of the light source is uniform to maintain consistency in the final product.

4. The driver chip package should facilitate the rapid heat dissipation of the driver chip die, such as bonding the die directly to the copper board, and having a pin directly extending outside the package for direct soldering to the copper foil of the pcb board. Rapid thermal conductivity. If a 300~1,000ma current is required to pass through a 4x4mm chip for a long time, power consumption and heat generation will inevitably occur. Therefore, the physical heat dissipation structure of the chip itself is also very important.

5. The ability of the driver chip to resist emi, noise and high voltage resistance is also related to whether the entire LED lighting products can pass the ce, ul and other certifications. Therefore, the advanced topology and high-pressure production process should be selected when designing the driver chip.

6. The power consumption requirement of the driver chip is less than 0.5w, and the switching operating frequency requirement is greater than 120hz, so as to avoid visible flicker caused by power frequency interference. In short, led green lighting has driven the development of innovative chips into innovative chips. Led luminaire lighting is inseparable from the driver chip, so it needs a multi-function LED light source to drive ic. If the LED fixture uses AC power below 36v, you can consider non-isolated power supply; if you choose 220v and 100v AC power, you should consider isolated power supply. Direct use of AC 100~220v driver chip, due to the demanding requirements of the volume, there are higher requirements and greater difficulty in technology, and countries are currently working hard to develop.

With brand name “INNOLITE®”, Innotech Industrial Co., Ltd. was founded in Shenzhen, the first Special Economic Zone in China, in 2001.We have Globe G95 Vintage LED light bulb, Globe G80 Vintage LED light bulb, LED Filament Lamps Candle C32 C35, LED Filament indicator lamps ST26, Antique LED filament bulbs Lantern.