Power hybrid circuit design and manufacture by Taraseiskey

By Taraseiskey

This authoritative reference discusses the basic layout rules, functions, and purposes of strength hybrid microcircuits and modules--detailing the operation of energy semi-conductor and passive elements, the homes of fabrics, layout directions, thermal administration, and production applied sciences.

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Rated working voltage is a maximum continuous voltage that may be applied to the capacitor. It is usually ratedat 85°C and then linearly derated to 2/3 of rated voltage at +125°C - the upper limit of military temperature range. The variation of leakage current with temperature is shown in Figure 2-14. In addition, it also depends on applied voltage and rapidly increases with increase of Figure 2-16 a) Dissipation factor vs. frequency, tantalum capacitors, b) ESR vs. frequency, ceramic and tantalum capacitors.

The ferrite pot core represents one of the most popular magnetics operating in a wide range of frequencies up to tens of megahertz. They are used in power hybrids as signal transformers, pulse transformers, power transformers and input/output filter chokes. As shown in Figure 2-17 the windings are completely enclosed inside the magnetic material with low loss, high permeability and high resistivity. Self shielding property of the pot core helps to minimize cross coupling and interference with closely positioned external circuitry.

Die sizes of MOSFET, IGBT, and bipolar transistors rated at 500 V and 15 A are compared in Figure 2-38. The current flow is shown in the left part of Figure 2-37. The correlation of transistor model containing a parasitic thyristor to silicon cross-section is shown on the right side. As the operating temperature goes up, the typical onsaturation voltage VCE(sat) of Figure 2-39a may increase or decrease dependent on the magnitude of collector current. Gate threshold voltage (Vge(th)) is defined as voltage applied between gate and emitter necessary to start the flow of collector current.

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