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參數(shù)資料
| 型號： | HA17723 |
| 廠商： | Hitachi,Ltd. |
| 元件分類： | FPGA |
| 英文描述： | 3000000 SYSTEM GATE 1.5 VOLT FPGA |
| 中文描述： | 精密電壓調(diào)節(jié)器 |
| 文件頁數(shù)： | 6/17頁 |
| 文件大小： | 91K |
| 代理商： | HA17723 |
HA17723/F/P
6
Negative Voltage Regulator:
Figure 3 shows the construction of a so-called negative voltage regulator,
which generates a negative output voltage with regard to GND. Assume that the output voltage, –V
OUT
,
increases in the negative direction. As the voltage across the R
1
is larger than that across the R
3
, which
provides the reference voltage, the output current of the error amplifier increases. In the control circuit, the
impedance decreases with the increase of input current, which makes the base current of the external
transistor Q approach GND. As a result, the output voltage returns to the established value and output
voltage is stable.
The output voltage –VOUT of this circuit is:
–V
OUT
= –
= –
V
REF
×
V
REF
×
R
3
R
3
+ R
4
(R
1
+ R
2
) · (R
3
+ R
4
)
R
2
· (R
3
+ R
4
) – R
4
· (R
1
+ R
2
)
R
1
+ R
2
R
3
+ R
4
R
3
R
1
CL
CS
COMP
V
IN
V
C
V
REF
V
IN
(+) V
IN
(–)
V
OUT
V
OUT
V
Z
C
100pF
R
2
11.5k
R
5
2k
R
4
3k
R
3
3k
R
1
3.65k
V
CC
V
EE
Q
Figure 3 Negative Voltage Regulator
How to Increase the Output Current:
To increase the output current, you must increase the current
capacity of the control circuit. Figures 4 and 5 show examples with external transistors.
CL
CS
COMP
V
IN
V
CC
V
REF
V
EE
R
SC
0.7
R
1
7.87k
R
2
7.15k
C
1
500pF
V
OUT
V
OUT
V
IN
(+)
V
IN
(–)
V
C
Q
Figure 4 Increasing Output Current (1)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HA17723F | 3000000 SYSTEM GATE 1.5 VOLT FPGA |
| HA17723P | Precision Voltage Regulator |
| HA17741 | General-Purpose Operational Amplifier (Frequency Compensated) |
| HA17741PS | General-Purpose Operational Amplifier (Frequency Compensated) |
| HA17747 | 3000000 SYSTEM GATE 1.5 VOLT FPGA |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HA17723F | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Precision Voltage Regulator |
| HA17723P | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Precision Voltage Regulator |
| HA17741 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:General-Purpose Operational Amplifier (Frequency Compensated) |
| HA17741/PS | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| HA17741PS | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:General-Purpose Operational Amplifier (Frequency Compensated) |
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