參數(shù)資料
型號: UPC29S78
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[05/2000]
文件頁數(shù): 33/35頁
文件大?。?/td> 187K
代理商: UPC29S78
User’s Manual G12702EJ8V0UM00
7
3. BASIC CIRCUITS OF A POWER SUPPLY IC
3.1 Basic Circuits
Although the basic circuits that make up a power supply IC differ according to the product type, the following
elements are necessary.
<1> Reference voltage circuit
<2> Error amplifier
<3> Active load (constant current circuit)
<4> Output stage power transistor
<5> Startup circuit
The following protection circuits also are on-chip.
<6> Overcurrent protection circuit
<7> Limiting circuit for securing safe operating area (SOA)
<8> Overheat protection circuit
Figure 3-1 shows a block diagram of a power supply IC.
Figure 3-1. Power Supply IC Block Diagram
INPUT
OUTPUT
Series bus
transistor
Protection
circuit
Current
source
Startup
circuit
Reference
voltage
Error amplification
circuit
Split resistor
RB
RA
GND
+
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