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| 型號： | 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[05/2000] |
| 文件頁數(shù)： | 34/35頁 |
| 文件大?。?/td> | 187K |
| 代理商： | UPC16318 |
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User’s Manual G12702EJ8V0UM00
8
The operation of each block is explained in simple terms below.
<1> Reference voltage circuit
The reference voltage circuit, which determines the output voltage of the power supply IC, is an extremely
important part within the circuit. The method for configuring this circuit is as follows.
Band gap reference method: Use the forward characteristic between the base and emitter of the transistor.
The possibility of making the reference voltage 2 V or less is a feature of this method.
Figure 3-2 shows the principles of the band gap reference method. Figure 3-3 is a simple circuit diagram
of the band gap reference reference voltage used in the
PC7800A Series.
Figure 3-2. Band Gap Reference Circuit
Q3
R1
R3
VBE
VREF
VREF = VBE3
+
(
ln
)
R2
R3
R2
q
KT
R1
R2
Q1
Q2
I
GND
V
+
The reference voltage is as follows.
VREF = VBE3 + (IC2 + IB3)
R2
= VBE3 +
(
VBE) + IB3 R2
= VBE3 +
ln
................................................................................................................ (3 - 3)
The temperature coefficient is as follows.
=
+
ln
.............................................................................................................. (3 - 4)
By optimally choosing the ratio of
, a temperature compensated reference voltage is known to be
obtained.
.
R2
R3
R2
R1
R2
R3
R2
R3
KT
q
R2
R1
VREF
T
VBE3
T
K
q
R2
R3
R2
R1
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