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| 型號(hào)： | UPC16318 |
| 英文描述： | Useage of Three-Terminal Regulators | User＇s Manual[05/2000] |
| 中文描述： | 使用三端穩(wěn)壓器|用戶手冊(cè)[05/2000] |
| 文件頁(yè)數(shù)： | 31/35頁(yè) |
| 文件大?。?/td> | 187K |
| 代理商： | UPC16318 |
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User’s Manual G12702EJ8V0UM00
5
1. INTRODUCTION
NEC produces a variety of ICs for power supplies that differ in their on-chip functions and usage. Within these,
large quantities of three-terminal regulators have come to be used to configure stabilized power supplies easily using
few external components.
However, the occurrence of unexpected irregularities when designing power supply circuits also has increased.
Therefore, this manual starts with the basic structure of the main bipolar process that is used in ICs for power
supplies and gives precautions pertaining to actual applications.
2. BASIC STRUCTURE OF A POWER SUPPLY IC
As mentioned in chapter 1, a power supply IC mainly uses a bipolar process. Understanding the structure of an
IC that uses a bipolar process also is useful for applications.
2.1 Structure of a Bipolar IC
The following elements can be made into an IC in a general bipolar process.
NPN transistor
PNP transistor
Resistor
Capacitor
Figures 2-1 through 2-3 show the structure of each.
Figure 2-1. Structure of NPN Transistor and PNP Transistor
Separation region
Collector
Base
P-type substrate
Emitter
NPN transistor
PNP transistor
n+
nn
p
n+
p
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