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您只需稍微留意一下电源的额定输入电压即可看出,IC可以限制可用的输入电压范围。通过仔细检查IC的工作规范和电路拓扑,您或许能够在此输入电压限制范围内进行工作。例如,TI(www.ti.com)的TPS61042产品说明书表明其具有为白色LED电路提供恒流驱动所必需的所有功能:但是,IC的输入电压并不能满足此“设计理念”的输入电压要求。双锂离子输入电压的变化范围为6至8.4V,但TPS61042的输入电压范围介于1.8至6V。进一步对电路检查后发现,功率级不需要连接到与控制IC相同的电压线路上。如图1所示,通过将TPS61042的输入电压与功率级分开,您可以使用超过6V的输入电压给LED驱动器供电。
You only need to pay a little attention to the rated input voltage of the power supply as you can see, IC can limit the available input voltage range. By carefully checking the IC’s operating specifications and circuit topology, you may be able to work within this input voltage limit. For example, the TPS61042 product specification from TI (www.ti.com) shows that it has all the features necessary to provide a constant current drive for white LED circuits: However, the input voltage to the IC does not meet the input voltage of this “design concept” Claim. Dual lithium-ion input voltage can vary from 6 to 8.4V, but the TPS61042 has an input voltage range of 1.8 to 6V. Further examination of the circuit found that the power stage does not need to be connected to the same voltage line as the control IC. As shown in Figure 1, by separating the TPS61042’s input voltage from the power stage, you can power the LED driver using an input voltage in excess of 6V.