IC multiple protection functions, including LED open circuit protection, LED short circuit protection, chip overtemperature protection, overvoltage protection, undervoltage protection and FB short circuit protection. In DIP-8 package. The most cost-effective power IC, the cost is less than 4RMB.
The IC above the LED power supply is the same as the CPU of the computer is a main component, mainly to control the output voltage and current. IC multiple protection functions, including LED open circuit protection, LED short circuit protection, chip overtemperature protection, overvoltage protection, undervoltage protection and FB short circuit protectionEscort. In DIP-8 package.
Many LED driver chips also have dimming functions, which can change the brightness of the LED lamp by adjusting the current, so that the dimming control function can be achieved.
TB62726 Function: LED driver chip, 16-bit shift latch. Pin 1 GND, power source.
1, the LED drive power supply is to convert the power supply to a specific voltageUnder normal circumstances, the input of the LED driver power supply includes high-voltage power frequency AC (i.e. mains), low-voltage DC, high-voltage DC, low-voltage high-frequency AC (such as the output of electronic transformers).
2, LED to constant current power supply, otherwise easy to aging damage. You can use LM317, the principle is to use 317 probe control voltage unchanged, and then divide the resistance, is the constant current value. The circuit is shown below. Lights can be connected as many as needed. Change R1 to change the current, current =25/R1. Let me know if you need more.
3, constant current drive power supplyp>2. When the forward voltage is added to the LED, the holes injected from the P region into the N region and the electrons injected from the N region into the P region are combined with the electrons in the N region and the holes in the P region within a few microns near the PN junction, respectively, to produce spontaneous radiation fluorescence.
3, the mains AC 220V power supply after the switch is connected to the two ends of the LED lamp feet can be. The wiring diagram is shown in Figure 1. LED daylight tube wiring diagram modification modification refers to the original use of ordinary fluorescent lamps in accordance with the requirements of LED daylight tube internal line transformation, so that it can be applied to LED daylight tube.
5, first install the current limiting resistor to the negative terminal of the power line. Then separate the positive and negative lines of the LED strip. Remove the positive line of the LED strip with the stripper. Stripped LED light positive line. As shown in the following picture. Connect the negative line of the power supply toThe positive line of the LED light strip is connected.
6, the figure is the driver power of the LED light, the general wiring method is as follows: the red and white line end is the power input end, the red and black line end is the output end (connected to the LED light source).
1, if the laptop can not be turned on (do not turn on/can not turn on the machine), the problem may be caused by static electricity on the motherboard. In this case, follow the steps below. (1) Please reinsertAdapters and batteries.
2, the power indicator is on, it means that the motherboard is overpowered, but it may not be turned on because of some devices. Please try to use the shortcut key (hot key) [Fn F7] to open/close the screen display to confirm whether there is no screen due to shutdown. Note: The combination of shortcut keys (hotkeys) may be different for some models, please refer to the user manual.
3, Asus notebook only the power light can not open the machine common reasons: there is a standing power generation; The mainboard cannot be started due to static electricity. The memory module falls off or is not in good contact. The hard disk is loose. Motherboard power supply chipWelding or aging.
4, Asus laptop power indicator flashes, and can not open the machine can first try to execute CMOS reset, part of the phenomenon can not be turned on by this way to solve.
5, the battery or power is out of power: the battery or power is out of power, which will directly lead to the ASUS computer can not open, which is often caused by poor contact. The solution is to reconnect the power supply to the Asus computer. If it can be turned on, the external power supply is damaged.
1, mainly divided into power supply part, drive board, high pressure board, and TV board. The power supply is the power supply, and the mains power is converted to the operating voltage of the LCD TV of 12V. The high pressure plate will boost 12V to 1500 ~ 1800V high voltage AC, used to light the CCFL backlight of the PANEL. The driver board drives the TFT of the control liquid crystal and is used to display the signal.
2, consists of the following parts: high-frequency circuit: mainThere is a high frequency head group, the function is to convert the high frequency TV signal into an intermediate frequency signal. Another function is to choose the stage. If circuit degree: Amplification TV signal asked. Demodulated out the video. Video amplifier circuit: output video signal to the display tube.
3, the LCD TV internal circuit board is: LCD color TV is mainly composed of a power board, signal processing board (also known as the motherboard, digital board or high-frequency board 10 decoding board), backlight driver board, logic board (also known as TC0N board, center board or timing control board), and LCD screen components.
4, the LCD TV and LCD disassembleOpen, you can see on the motherboard printed with a string of numbers and English characters, this string of characters is the LCD TV and LCD motherboard plate number.