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參數(shù)資料
| 型號(hào)： | 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(cè)[05/2000] |
| 文件頁數(shù)： | 4/35頁 |
| 文件大?。?/td> | 187K |
| 代理商： | UPC29S78 |
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User’s Manual G12702EJ8V0UM00
12
Figure 3-6. Adjustable Output Type Block Diagram
VREF
RB
Output
voltage
setting
circuit
RA
INPUT
OUTPUT
Protection
circuit
Current
source
Startup
circuit
Reference
voltage source
ADJ
+
VO
3.3 Operating Principles of Low Saturation Types
All of the power supply ICs discussed so far use Darlington connected NPN type transistors in the output stage.
Therefore, the voltage difference between input and output that is needed to operate these power supply ICs cannot
be lower than the voltage between the base and emitter of the Darlington connected output stage transistor (0.7 V
×
2 = 1.4 V). A low saturation type power supply IC makes it possible to operate with a small voltage difference
between input and output by using a PNP transistor as the output stage transistor (refer to Figure 3-7).
Figure 3-7. Differences Between General Power Supply IC and
Low Saturation Type Output Stage Configurations
(a) General power supply IC
(b) Low saturation type power supply IC
IN
OUT
GND
0.7 V
IN
OUT
GND
Configurations other than this are nearly identical to a general power supply IC.
Figure 3-8 shows a block
diagram.
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