CA-288 Universal 26 to 55-inch LED LCD TV backlight driver board booster plate constant current high voltage Обустройство дома - купить

Купить CA-288 Universal 26 to 55-inch LED LCD TV backlight driver board booster plate constant current high voltage | Обустройство дома

In view of many buyers for the LED driver board topology do not understand, its working principle does not understand the direct result of the consequences can not be properly used! I hereby Secretary of the current popular topology program brief. The most commonly used topology there are three: boost, buck, boost-buck.

1. Boost topology means boost type. (Vout) must be higher than the power supply input voltage (Vin), and the ratio is greater than 1: 1.5, that is, if the input voltage is 12V, the LED string voltage must be In the 18V or more, then the LED boost board to work properly, if the LED string voltage is slightly higher than VIN or VIN below the situation that occurs when the machine is a power LED lights up, driving the board switch, dimming, etc. can not Consequences of Control. 2.Boost program has the advantage of simple structure, high efficiency. The disadvantage is that the boost ratio is limited, generally the best boost ratio of 2-4 times. More than 6 times when the switching loss increased sharply, the switch device temperature soared, the system stability deterioration.

2. Buck topology means the buck type. (Vout) must be lower than the power supply input voltage (VIN), that is: if the input voltage is 12V, the light bar voltage is lower than 12V, is 24VIN when the constant current board using such programs require the load voltage It will be less than 24V, if the LED light bar when the voltage is higher than VIN can not drive light. Buck scheme has the advantage of simple structure, efficiency is slightly higher than the Boost program. The disadvantage is that only a small number of series LED, when the power is too large number of parallel groups, for space-constrained LED backlight module PCB traces adverse.

3.Boost-buck topology means up-buck type. Interpretation: This program also has a rise - buck function. The first two modes of the program it has. But the disadvantage is that the efficiency is low, not suitable for power larger occasions.

The industry's most widely used Boost program, Buck followed, boost-buck smaller.

More common LED driver board program works, presented to you, I hope you do in the pro to understand, to better and more accurate completion of the operation. , & Lt;

Problems that may be encountered with proper lighting:

1.Brightness is not enough, the screen is significantly darker than the original board, this time from two aspects, one, connected to the dimming feet after trying to try to adjust the brightness of the remote control can be resolved, if not resolved, to test the actual feet Bit voltage, (Note: I products0VWhen the brightness of the darkest, the darkest when the voltage is high. ) If the voltage range is analog voltage mode is0V-5Vor0V to 3.3V, If the voltage has been in a high voltage can not be reduced should be adjusted. ifPWMThe voltage of the signal is stable3.3V, This time if transferred to the brightest or fail to meet the requirements you have to implementThe second scheme. Second, adjust the board resistance, the current increases, to meet the requirements.