Datasheet > UPC14312

UPC14312

更新时间： 2022-01-19 01:18:00

品牌	Logo	应用领域
其他 - ETC		三端稳压器
页数	文件大小	规格书
35页	186K
描述
Useage of Three-Terminal Regulators \| User＇s Manual[05/2000]

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UPC14312 数据手册

Figure 2-2. Structure of Resistor

Base diffused resistor

Base pinch resistor

Separation region

P-type diffusion

Epitaxial layer

electrode

Separation region

Resistor

electrode

n⁺diffusion layer

Resistor

electrode

P-type diffusion

layer

Resistor

electrode

Resistor

electrode

Separation

region

Pinch

region

layer

n⁺

P-type substrate

Figure 2-3. Structure of Capacitor

MOS capacitor

Junction capacitor

Oxide

layer

Separation region

−

Separation region

AI electrode

n⁺

P-type substrate

There is a point to heed in applying power supply ICs. It is that a method known as "junction separation" is used

as the method of electrically separating each of the elements above. By connecting a separation region so that it is

formed by a P-type semiconductor and is the same lowest potential as the substrate, the element region and the

separation region are electrically separated and insulated by being in (PN junction) reverse bias states. If for some

reason the potential of this separation region becomes a higher potential than the element region (for example the

NPN transistor collector region in Figure 2-1), normal operation cannot be expected since the PN junction enters a

forward bias state and the separation state between the elements cannot be maintained. For example, when using a

positive output three-terminal regulator, the GND pin always must be made a lower potential than the potential of

other pins.

2.2 About Power Supply IC Equivalent Circuits

Equivalent circuits that are shown in data sheets are so designated assuming the premise of the preceding

section (that separation regions and substrate are made the lowest potential). Be careful not to reference these

when this premise is violated.

User’s Manual G12702EJ8V0UM00

1...3 4 567 8 9...35

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