mosfet power dissipation calculation infineon
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0000008260 00000 n Moreover, nothing is available to aid power dissipation except some minimal amount of pc-board copper situated underneath the supply.MOSFET selection begins by choosing devices that can handle the required current, given an adequate thermal dissipation path. For help selecting a discrete MOSFET or power block solution for your buck converter application, check out our Buck Converter NexFET™ selection tool . @jippie Thanks for the reference, unfortunately that explains why the power rating of the MOSFET is LOWER than suggested by the P_D and R_DS(on) figures. 0000015641 00000 n
In fact, today's portable core supplies can require up to 40 A or more, at between 0.9 and 1.75 V. But while current requirements have increased steadily, the space available for power supplies has not—a fact that has stretched thermal designs to the limit and beyond.Such high-current supplies are typically broken into two or more phases, with each phase handling between 15 and 25 A. Anybody can ask a question
Infrequent, powerful current pulses will heat it basically only to the extent of their RMS value, not instantaneously to incandescence. Stack Exchange network consists of 177 Q&A communities including 0000121591 00000 n I_Dmax is not limited by power dissipation in the way that you think--imagine 100ns pulses with a duty cycle of 1%. Lower the MOSFET power dissipation by choosing a more suitable MOSFET. 0000079857 00000 n 0000215213 00000 n As several terms within the power dissipation calculation are interdependent, an iterative process is useful to determine this number (Figure 1). Other sources may include stand-by power dissipation 0000150655 00000 n 0000045471 00000 n Likewise, peripherals like flash memory typically do not run at 5 V without their own level shifters. Iteration process is introduced to evaluate as well the maximum allowable power dissipation as the conduction and switching power losses of the MOSFET. 0000149614 00000 n Making this calculated ambient temperature as high as possible may seem tempting, but it's not usually a good idea. Does that help a bit?I should also say that thermal resistance is not a static quantity, but time-dependent because the MOSFET has a certain heat capacity and thermal diffusion rate. 0000153662 00000 n Have a +1 from me, solely for reading a datasheet in that detail. 0000005083 00000 n So, it is hard to know where to begin. 0000120496 00000 n 0000215012 00000 n 0000081546 00000 n please help! V_GS = 6V and V_DS = 12V.Yup, that's the way MOSFET datasheets work.
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