1. The nominal input voltage range of the driver chip should meet DC 8~40V to cover a wide range of application needs. The withstand voltage is preferably greater than 45V. When the input is AC 12V or 24V, the output voltage of a 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, thereby burning the LED light source.

2. The nominal output current of the driver chip is required to be greater than 1.2~1.5A. As an LED light source for lighting, a 1W power LED light source has a nominal operating current of 350mA, and a 3W power LED light source has a nominal operating current of 700mA. High-power LED light sources require more current, so the driver IC selected for LED lighting must have sufficient current output. When designing the product, the driver IC must also work in the best working area of 70~90% of the full load output. The driver IC that uses the full-load output current does not dissipate heat well in the narrow space of the luminaire, which easily leads 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 emit light stably without flickering. When using the same batch of drive chips under the same conditions, the output current should be as consistent as possible, that is, the discreteness should be small, so that efficiency and order can be ensured when they are produced on a mass automated production line. For the driver chip with a certain discrete output current, it must be selected before leaving the factory or put into the production line. Adjust the resistance value of the current setting resistor on the PCB, so that the LED lamp constant current driver board produced is compatible with similar LEDs. The luminous brightness of the light source is consistent to maintain the consistency of the final product.