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| 型號(hào)： | UPC3025 |
| 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)： | 35/35頁(yè) |
| 文件大小： | 187K |
| 代理商： | UPC3025 |
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User’s Manual G12702EJ8V0UM00
9
Figure 3-3. (Simplified) Band Gap Reference Circuit of
PC7800A Series
VREF
VIN
GND
<2> Error amplifier
This circuit controls the output voltage by detecting and comparing the reference voltage created by the
reference voltage circuit and the resistor split output voltage. If VOUT is the output voltage and VREF is the
reference voltage (refer to Figure 3-1), the following relationship holds.
VOUT =
VREF ........................................................................................................................ (3 - 1)
Here, A is the open loop gain of the error amplifier and
β = RA / (RA + RB).
<3> Active load (constant current circuit)
Expression (3 - 1) becomes the following if the open loop gain A of the error amplifier is sufficiently large
compared to 1.
VOUT = VREF/
β
A small bias current and high resistance are realized by using a constant current circuit in the error amplifier
load to make A 60 to 80 dB.
<4> Output stage power transistor
The output stage power transistor supplies current to the load. Although normally a Darlington form NPN, the
low saturation type of power supply IC uses a PNP single transistor.
.
A
β (1 + A)
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