Non-isolated circuits are relatively simple and do not require a transformer. The MP4000 is also the only IC that does a soft switch. What is a soft switch? Everyone knows that the efficiency of a power supply depends on the loss. Soft-switch-controlled LED driver ICs provide high efficiency solutions as well as dimming. First take a look at the MP4000, 1-30W non-isolated LED driver. Non-isolated circuits are relatively simple and do not require a transformer. The MP4000 is also the only IC that does a soft switch.
What is a soft switch? Everyone knows that the efficiency of a power supply depends on the loss. Where is the consumption? In two aspects, one is conduction loss, and the other is switching power supply with switching loss, including drive loss. What is the relationship with this? It has something to do with frequency. The general switching loss is the integral of current and voltage. The traditional approach is hard switching, and the switching losses are relatively large. Because the voltage is down, there is a crossover when the current goes up. This is a soft-switching IC, how is it achieved? Everyone knows the critical conduction mode. Through the electric drive terminal, when the critical introduction is made, the voltage is suddenly changed, so the current backflow is detected, which is the mode of zero current turn-on. Zero current can bring efficiency, for example, 90% efficiency can save switching loss and conduction loss compared with competitors.
Method for analyzing LED lighting driving problems
In addition, the diode part, if it is a CCM hard switch, requires a fast reverse recovery, but the MP4000 mode is not needed. The voltage in Japan is 100VAC. The MP4005 is very simple. One is 190V, one is 220V, and the impedance is 4.85Ω. The control method is also a soft-switching technology, so it can provide good efficiency and the peripheral devices are very simple. This is a non-isolated driver for the US and Japanese markets. The AC-DC resistor has a large loss. The MP4001's SmartLDO is powered directly to the IC. Only the voltage can be charged in the interval of 15-30V, the other is blocked, and the charging time is very short. So SmartLDO can provide a very small loss solution. If you use 3400, 5W with MP4001 can provide very high efficiency. Non-isolated PFC is not required, especially for low power applications. However, when developing an LED driver with a power of 8 W or more, it is necessary to provide a PFC.
The MP4020/4021 series is a SingleStagePFC isolation solution. Compared with the traditional, the cost can be saved a lot, there is a high PFC value, and it is also a critical conduction mode, the loss will be relatively small when turned on. How to solve the dimming and starting failure If the conduction angle is cut off a lot, the startup is often a problem. For the IC, because the voltage is very low, the dimming cannot be adjusted or there will be flicker. The MP4030 provides a good solution.
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