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Inductors allow loss-less current sensing in multiphase DC-DC converters

机译：电感器允许在多相DC-DC转换器中进行无损电流感测

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摘要

High performance microprocessors require a low-voltage, high-current power supply with fast transient response. Therefore, interleaved multiphase synchronous buck converters have gained popularity as the VRM for these microprocessors. Multiphase converters must share load current to balance thermal stress on each phase, so it's important to address current sensing and sharing. You can use the current signal in adaptive voltage positioning to reduce the output voltage deviation during transients, which requires accurate current information. Current sense resistors have high accuracy, less than ±5%, and their temperature coefficient (TC) is small. However, the sense resistor connection is in the power path, which generates additional power loss and lowers efficiency-especially in high output current applications {sup}([1]). Another disadvantage of the sense resistor is its relatively high cost. Current sensing through MOSFET R{sub}(DS(on)) is a loss-less method, but this on-resistance has a large tolerance from lot to lot even for a given manufacturer and changes with the gate-drive voltage of MOSFET {sup}([1]) The TC tolerance of R{sub}(DS(on)) isn't well defined, and is not always available.
机译：高性能微处理器需要具有快速瞬态响应的低压大电流电源。因此，交错式多相同步降压转换器作为这些微处理器的VRM获得了普及。多相转换器必须共享负载电流以平衡每一相的热应力，因此解决电流检测和共享问题很重要。您可以在自适应电压定位中使用电流信号来减少瞬态期间的输​​出电压偏差，这需要准确的电流信息。电流检测电阻具有很高的精度，小于±5％，并且其温度系数（TC）小。但是，检测电阻器连接在电源路径中，这会产生额外的功率损耗并降低效率，特别是在高输出电流应用中{sup}（[1]）。感测电阻器的另一个缺点是其成本较高。通过MOSFET R {sub}（DS（on））进行电流检测是一种无损耗的方法，但是即使对于给定的制造商，这种导通电阻也具有很大的容差，并且会随MOSFET { sup}（[1]）R {sub}（DS（on））的TC容限定义不明确，并且并非始终可用。

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