As a new type of light source, LED has received wide attention from energy saving, long life and no pollution. However, from the domestic market, there is still a certain process to replace traditional energy-saving lamps. However, I personally look at the current LED market , under the premise of quality assurance, the price can also open the domestic LED lighting market under reasonable circumstances.
At present, Taiwan Digital Energy Technology has developed an IC NU501 specifically for LED lighting, which realizes a low-cost constant current driving scheme. The total cost of the entire constant current driving power supply is about RMB2. The following is a specific program description:
The Nu501 is a newly designed linear LED constant current driver IC packaged in sot 23-3 with an application voltage range of 0.4-12V and an output current of 15-60mA. Due to the high withstand voltage, in a multi-lamp series application, only a small number of external components are required, and an AC input application can be realized. Compared with the conventional application circuit, the isolation transformer is saved, and the volume of the entire system is reduced. And design costs. This product is mainly used in home lighting and landscape lighting.
parameter settings:
1. D1~D4 form a rectifier bridge through 4 diodes, and AC220V AC passes through the rectifier bridge to output DC DC.
2, C1 capacitor selection
In the circuit, C1 is an electrolytic capacitor, which mainly plays a filtering role and can improve the efficiency. In order to ensure higher efficiency, it is better to use 10UF or more. Since 220V AC rectification is 311V DC, estimate the withstand voltage value of the capacitor. More than 300V.
3, the MOS switch tube in the circuit is mainly responsible for the voltage drop, such as the string of 75 LED lamp beads in the circuit, in this case, the voltage drop to be borne on the MOS tube is about 70V, so its heat will be compared Large, heat sinks need to be added for heat treatment. In order to reduce the heat dissipation, it is also possible to use a MOS switch tube with a larger current.
4, NU501 is a constant current design of 15ma to 60ma, so when selecting the output current, you can choose according to the current you need to achieve the constant current source you want.
Test Data:
The following table shows the test data of 150 (75 series, 2 and) 0.07W white LED lamp beads:
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