By Jacek Korec
Low Voltage energy MOSFETs specializes in the layout of low voltage strength MOSFETs and the relation among the gadget constitution and the functionality of an influence MOSFET used as a swap in strength administration purposes. This SpringerBriefs shut the space among targeted engineering reference books and the various technical papers almost about energy MOSFETs. the cloth provided covers low voltage functions extending from battery operated transportable electronics, via aspect of load converters, web infrastructure, car functions, to non-public desktops and server pcs. the problems handled during this quantity are defined qualitatively utilizing schematic illustrations, making the dialogue effortless to persist with for all potential readers.
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Extra resources for Low Voltage Power MOSFETs: Design, Performance and Applications
Example text
In practical applications some small degree of shoot-through is tolerable, but it lowers the converter efficiency at light load condition (Fig. 20). Also, during the shoot-through event a small current flows through the LS transistor which already blocks a significant Vds voltage. This may lead to reliability concerns even if the operating point is well within the allowed SOA regime (Safe Operating Area). For these reasons it is wise to avoid any shoot-through current if possible. 3 Mastering of Ringing Switch node voltage ringing similar to the one shown in Fig.
Low input voltage for the 2nd stage means, that the switches can be designed for low breakdown voltage (BV) which significantly improves their specific on-resistance (Rsp = Rds,on ∗ Area). Using 30 V MOSFET design as a reference the reduction of Rsp for lower voltage devices is shown in Fig. 3. A redesign of a MOSFET for a lower BV results in a smaller pitch of the active cell increasing the density of the channel per unit area of the Silicon die. This is one of the main reasons for the reduced Rsp value.
The switching power loss decrease with lower Vin anyhow, as the power loss during switching is proportional to the switched voltage. The above discussion is illustrated by calculation results presented in Fig. 7.