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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[05/2000] |
| 文件頁數(shù)： | 5/35頁 |
| 文件大?。?/td> | 187K |
| 代理商： | UPC29S78 |
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User’s Manual G12702EJ8V0UM00
13
Figure 3-8. Low Saturation Type Block Diagram
INPUT
Series path transistor
(PNP type)
OUTPUT
Limiting circuit
for securing
SOA
Overcurrent
restriction
circuit
Drive
circuit
Overheat
protection
circuit
Reference
voltage
circuit
Startup
circuit
GND
Error
amplifier
4. POWER SUPPLY IC APPLICATION CIRCUITS
4.1 Typical Circuit Connection
<1> Fixed output voltage type
Figure 4-1 shows an example of a typical circuit connection. Check the data sheet for each product type for
the values of input and output capacitors.
Figure 4-1. Example of Typical Circuit Connection (Single Power Supply Output)
CIN : If the wiring from a smoothing circuit to the
three-terminal regulator is long, there may be
oscillation.
Therefore, add a 0.1 to 0.47
F
capacitor with superior voltage and temperature
characteristics near the input pin.
CO : This
always
must
be
added
for
oscillation
prevention in the case of a negative voltage three-
terminal regulator.
For an application in which
the load current changes suddenly, also add 10
to 100
F of electrical capacitors for output voltage
transient response improvement.
D1 : Although not needed for standard applications, this
is necessary when the time constant on the load
side is long and there is a residual voltage in CO for
some time after the power supply is cut and
backward voltage is applied to the regulator IC.
D2 : Needed when there is a possibility of OUTPUT
being lower potential than GND.
OUTPUT
INPUT
D2
CO
CIN
Three-terminal regulator
D1
+
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