The nominal output voltage range of the driver chip should meet DC8-40V to cover the needs of the use surface. It is better to withstand voltages greater than 45V; The input voltage of a complex bridge rectifier with AC12V or 24V output will fluctuate with the grid voltage, especially when the voltage is too high, the input DC voltage will also be too high. If the drive IC cannot comply with a wide voltage range, it will often be affected when the grid voltage is reduced As a result, the LED light source was burned. 2. The nominal input current of the driver chip led water proof lamp with sensor needs to be greater than 1.2-1.5A. As a LED light source for lighting, the nominal task current of a 1W power LED light source is 350mA, and the nominal task current of a 3W power LED light source is 700mA. High power requires more current, so the driver IC selected for LED lighting must have sufficient current input. When designing the product, the driver IC task must be in the optimal task area of 70-90% of the full negative input. A driver IC that operates at full negative input current does not dissipate heat in a narrow space of the lamp, which is prone to fatigue and later effective. 3. The input current of the driver chip must be constant and constant, the LED light source can fluctuate and emit light, and the brightness will not flicker; the same batch of driver chips operate under the same conditions, and the input current needs to be as different as possible, that is, the reunion needs to be small, so that A large number of automated consumer online consumer talents are ineffective and orderly; driver chips with a certain degree of reunion on the input current must be binned before leaving the factory or put into the consumer line, and the resistance value of the current setting resistor (Rs) on the PCB board must be adjusted. In order to make the consumption of the constant current driver board of the led lamps different from the luminous brightness of similar led light sources, adhere to the differences of the final product. 4. The package of the driver chip should be conducive to the rapid heat dissipation of the driver chip die. For example, if the die is directly bound to the copper board, and a pin is directly extended outside the package, it is convenient to directly solder the copper foil on the PCB board. Heat quickly on the top (Figure 1). For example, on a similar 4X4mm silicon die, it takes a long time to pass a current of 300-1000mA, there must be power consumption, it must be heated, and the physical heat dissipation structure of the chip itself is also critically needed. 5. The ability of the driver chip to resist EMI, music, and high voltage is also related to whether all the LED lighting products can pass CE, UL and other certifications. Therefore, the driver chip itself needs to choose an excellent topology and high voltage at the beginning of the design. Consumer technology. 6. The power consumption of the driver chip itself needs to be less than 0.5W, and the switching task frequency must be greater than 120Hz to avoid visible flicker due to power frequency disturbance. LED green lighting promotes the development of driver chips to innovative designs. LED lamp lighting is inseparable from the driver chip. Therefore, a variety of LED driver ICs are required. Led lamps use AC power below 36V to think about non-isolated power supply, such as 220V and 100V AC power should think about isolated power supply. Directly operating the AC100-220V driver chip, due to the demanding use of the volume, there are still higher technical requirements and greater difficulties in technology. At present, all countries are working hard to develop.
