LED Light Strip Features

Circuit design
The most commonly used specifications for low-voltage LED light strips are 12V and 24V. The 12V is a 3-string multi-way parallel structure, and the 24V is a 6-string multi-way parallel structure. Since the LED light strips are to be connected for use, the specific length of each light strip that can be connected is closely related to the width of the line and the thickness of the copper foil during design. Because the current intensity that can be borne per unit area is related to the cross-sectional area of ​​the line, if this is not taken into account during wiring, when the connection length exceeds the current that the line can withstand, the light strip will heat up due to overcurrent, damaging the circuit board while also reducing the service life of the LED.
Production process
Since the LED light strip is a series-parallel structure, when a short circuit occurs in a group of circuits, it will cause the voltage of other LEDs in the same group to increase, the brightness of the LED will increase, and the corresponding heat generation will also increase. The most obvious is in the 5050 light strip. When any chip circuit of the 5050 light strip has a short circuit, the current of the short-circuited lamp bead will double, that is, 20mA becomes 40mA, and the brightness of the lamp bead will become very bright, but at the same time, the heat will also increase dramatically, and in serious cases, the circuit board will be burned within a few minutes. However, this problem is relatively obscure, and generally it is not paid much attention to, because the short circuit does not affect the normal light emission of the light strip. If the employee responsible for testing only pays attention to whether the LED is emitting light, but does not check the abnormal brightness, or does not do an appearance inspection, but only does an electrical test, this problem is often ignored. This is why many LED light strip manufacturers always encounter customer complaints that the product is heating up but they can't find the reason.
Solution:
1. Circuit design: The circuit should be as wide as possible. The spacing between the lines is 0.5mm, and the rest of the space is best filled. The thickness of the copper foil should be increased as much as possible without violating the customer's requirements for the total thickness of the circuit board. The general thickness is 1~1.5 OZ
2. Production process:
A/, when printing solder paste, try not to allow soldering between pads to avoid welding short circuits caused by poor printing;
B, avoid short circuits when mounting
C, check the position of the mounting before reflow
D, perform an appearance inspection after reflow to ensure that the light strip has no short circuit before conducting an electrical test review. During the review, pay attention to whether the LED is abnormally bright or dark after lighting.