description:
The same single-string design, the boost structure (Figure 4) will be less efficient than the buck structure, but the number of LEDs connected in series is no longer limited by the withstand voltage of the IC, but is determined by MOS, so it can be connected in series. LED. Since most solar cells have low output voltages, solar street lights are more suitable for use in boosting structures. The constant current design of the current mode allows the output current to be less affected by the input voltage change, and the street lamp can maintain the same brightness when the battery is fully loaded and when there is no power.
The advantage of this scheme is that the number of LEDs in series is not limited by the IC withstand voltage. The disadvantage is that the circuit cost is higher and the efficiency is slightly lower than that of the step-down structure.
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