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AN3994 Datasheet(PDF) 8 Page - STMicroelectronics |
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AN3994 Datasheet(HTML) 8 Page - STMicroelectronics |
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8 / 53 page  Parasitic capacitances overview AN3994 8/53 Doc ID 022380 Rev 1 2 Parasitic capacitances overview When dealing with high speed switching applications, the most critical MOSFET parameters limiting its dynamic response are the parasitic capacitances. Figure 5 shows the physical origin of the parasitic component in an N-channel Power MOSFET: Figure 5. N-channel Power MOSFET structure and intrinsic capacitances Figure 6. Equivalent model of Power MOSFET intrinsic capacitances Cgs is mainly due to the overlap between the gate and the source metallization (“3” and “4” components in Figure 5 and 6). Capacitors “5” and “6” are MIS (metal-insulator- semiconductor) capacitors between the gate and the p-body. The Cgs value is linked to the geometry of the device and it's almost independent of the voltage applied. AM10768v1 Source metal Source metal 4 Intermediate dielectric 4 Intermediate dielectric 2 1 5 6 4 3 Polysilicon gate Gate oxide N++ source N++ source 2 1 5 6 4 3 Polysilicon gate Gate oxide N++ source N++ source 2 5 P/P+ Body P/P+ Body 2 5 P/P+ Body P/P+ Body 7 N- drain 7 N- drain |
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