Advanced Power MOSFET Concepts by B. Jayant Baliga

By B. Jayant Baliga

"Advanced energy MOSFET innovations" offers an in-depth remedy of the physics of operation of complex strength MOSFETs. Analytical types for explaining the operation of the entire complex energy MOSFETs are built and defined. the result of numerical simulations are supplied to offer extra perception into the machine physics and validate the analytical types. the result of two-dimensional simulations also are given, with the intention to corroborate the analytical types and provides additional perception into the gadget operation. This quantity additionally: -Discusses units which could have an important influence on bettering the potency of the voltage-regulator-modules used to carry strength to microprocessors and images chips in laptops and servers -Covers purposes in all decrease voltage circuits, in particular the automobile electronics zone comprises numerical simulation examples to give an explanation for the working physics and validate the types - deals wide assurance of the position of silicon carbide within the layout and constitution of strength rectifiers "Advanced energy MOSFET suggestions" is a must-read for researchers and training engineers within the strength equipment industry.

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23 at a drain bias of 20 V. The input capacitance is comprised of two components – the first is between the gate electrode and the source electrode (CGS) while the second is between the gate electrode and the base electrode (CGB). The total input capacitance can be obtained by the addition of these capacitances because they are in parallel and share a common contact Power D-MOSFET Structure Specific Input Capacitances (nF / cm2) –10 Drain Bias = 20 Volts 0 CGB 10 CGS 20 0 2 4 6 8 Gate Bias Voltage (Volts) Fig.

2 29 Accumulation Resistance In the power MOSFET structure, the current flowing through the inversion channel enters the drift region at the edge of the P-base junction. The current then spreads from the edge of the P-base junction into the JFET region. The current spreading phenomenon is aided by the formation of an accumulation layer in the semiconductor below the gate oxide due to the positive gate bias applied to turn-on the device. 3) In writing this expression, a coefficient KA has been introduced to account for the current spreading from the accumulation layer into the JFET region.

This model produces a smaller contribution to the specific 28 2 D-MOSFET Structure WCell WC /2 WG LCH WS /2 WPW/2 LA Source Gate xJP+ xJP P+ t tSUB N+ P-Base a LN+ W0 P+ y dy N-Drift Region XD N+ Substrate Drain Fig. 5 Power D-MOSFET structure with current flow model B used for analysis of its internal resistances on-resistance from the JFET region than Model A but the contribution from the drift region is enhanced. 1 Channel Resistance The contribution to the specific on-resistance from the channel in the D-MOSFET structure is the same for models A and B.

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