10‑48 inch LED LCD TV Light Strap Backlight Driver Board DIY Kit 11‑30V Input
Descrizione
Features: 1. Suitable for 10 48 inch LCD TVs for all brands and models. 2. Input voltage: 11 30V; Output voltage: 15 88V, default current 200MA. 3. Connect the resistors to solder the marker points to increase the current accordingly. 4. The output voltage is 15 88V, no need to change manually, the board will automatically adapt to boost. 5. The 10MA 1000MA current can be adjusted as needed. Specification: Color: green Uses: for 10 48 inch LED TVs and monitors Input voltage range: 11 30V Output voltage range: 15 88V Output current: 10 1000MA can be set Package List: 1 * Driver Board Note:
Correctly illuminate problems that may be encountered: 1. The brightness is not enough, the screen is obviously darker than the original board. At this time, we start from two aspects. First, after connecting the dimming foot, try to adjust the brightness with the remote control. If it can t be solved, test the actual. The voltage of the pin, (Note: my product has the highest brightness at 0V, and the brightness is the darkest when the voltage is high.) If the voltage range of the analog voltage mode is between 0V 5V or 0V 3.3V, if the voltage is always high The voltage cannot be reduced and should be adjusted. If it is a PWM signal, the voltage is stable at 3.3V. At this time, if the light is adjusted to the brightest or the requirement is not met, the second scheme must be implemented. Second, adjust the resistance on the board to increase the current to meet the requirements. In view of the fact that many buyers do not understand the topology of the LED driver board, the lack of understanding of its working principle directly s to the consequences of not being able to use it correctly! Hereby, our company briefly introduces the current popular topology solutions. There are three main types of topologies: boost, buck, boost buck. 1. The boost topology means a boost type. Interpretation: The constant current plate using such a scheme requires the load voltage (Vout) to be higher than the power input voltage (Vin), and the ratio is greater than 1:1.5, that is, if the input voltage is 12V, the voltage of the LED string must be At 18V or above, the LED booster board can work normally. If the voltage of the LED string is slightly higher than VIN or lower than VIN, the LED will be on when the device is powered on, and the driver board switch, dimming, etc. cannot be used. The consequences of control. 2. The advantage of the Boost scheme is that the structure is simple and the efficiency is high. The disadvantage is that the boost ratio is limited, and the optimum boost ratio is generally 2 4 times. When the frequency exceeds 6 times, the switching loss increases sharply, the temperature of the switching device rises sharply, and the stability of the system deteriorates. 2. Buck topology means step down type. Interpretation: The constant current plate using such a scheme requires the load voltage (Vout) to be lower than the power supply input voltage (VIN), that is, if the input voltage is 12V, the voltage of the light bar is lower than 12V, which is 24VIN. It is lower than 24V, and if the voltage of the LED strip is higher than VIN, it cannot be driven to light. The Buck scheme has the advantages of simple structure and slightly higher efficiency than the Boost scheme. The disadvantage is that only a small number of series LEDs are required, and when the power is large, the number of parallel groups is too large, which is unfavorable for the compact LED backlight module PCB routing. 3. The Boost buck topology means a boost buck type. Interpretation: This type of program has both up and down functions. It works in both modes of operation. But the disadvantage is that the efficiency is low, not suitable for large power applications. The most widely used in the industry is the Boost solution, followed by Buck and boost buck. The working principle of the above common LED driver board solutions is presented to everyone. I hope that you can understand the problems when you use them to complete the work better and more accurately. .
