What does the lamp cup drive IC mean
The power consumption requirement of the drive chip is less than 0.5 w, and the operating frequency of the switch is greater than 120hz, so that there is no visible flicker of the interference. In short, led green lighting drives the development of the drive chip to innovative design. Led lighting is dependent on the drive chip, so a multi-functional led is required to drive the IC. If led lamps are chosen for the ac power supply below 36v, consider non-isolated power supply. If you use 220v and 100v ac power supply, you should consider isolating power supply. Direct use of ac 100 ~ 220 v driver chip, for application to the demanding requirement of the volume, and higher demands on technology, greater difficulty, in the countries are working to develop at present.
?The driver chip packaging should be conducive to drive the rapid cooling tube core chip, such as the bare chip directly binding on copper plate, and there is a pin directly extends to the outside of the package, so that the welding on the PCB board of the copper foil directly fast heat conduction. If is similar in 4 x4mm chip to for a long time by 300 ~ 1000 ma current, is inevitably produce power consumption and fever, therefore, the physical structure of the heat dissipation of chip itself is very important. 5. Driver chip emi resistance, noise, and the ability of resistance to high pressure is related to the led lighting products can pass the ce, ul certification, so when designing driver chip is advanced topology structure and high production process.
The output current of the drive chip must be kept constant so that the led is stable and lightening. The same driver chip used in the same condition, the output current size to be as consistent as possible, which is discrete, when the mass production automation production line so to ensure effective and orderly. For discrete driver chip output current to a certain extent, will choose to step in front of the factory or production line, to adjust the resistance current setting resistance on PCB board, make the production of led lamps and lanterns of constant current drive threatening the same luminous brightness of the led light source is consistent, to maintain the consistency of the final product
The drive chip's nominal output current requirement is greater than 1.2 to 1.5 a. As the illuminant led light source, 1w power led illuminant is 350ma, 3w power led illuminant the nominal working current is 700ma. Large power led light source, need more current, so the led illumination lamps and lanterns of driver IC must have enough current output, design products must also be driving IC working at full capacity, the output of 70 ~ 90% of the best work area. The drive IC that USES full load output current is in the lamps and lanterns narrow space heat is not flowing, can cause the lamps and lanterns to be tired and the early failure.
The nominal input voltage range of the drive chip should meet dc 8 ~ 40v to cover a wide range of applications. The ability to withstand pressure is better than 45v. When the input is ac 12 v or 24 v, simple bridge rectifier output voltage can follow the grid voltage fluctuation, especially when the high voltage output dc voltage will be on the high side. If the driver IC doesn't have a wide input voltage range, it tends to be punctured when the grid voltage is raised to burn down the led light.
