- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383239 > L7809AC (意法半導(dǎo)體) PRECISION 1A REGULATORS PDF資料下載
參數(shù)資料
| 型號(hào)： | L7809AC |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | PRECISION 1A REGULATORS |
| 中文描述： | 精密1A條調(diào)節(jié)器 |
| 文件頁(yè)數(shù)： | 14/17頁(yè) |
| 文件大小： | 108K |
| 代理商： | L7809AC |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)當(dāng)前第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)
APPLICATIONS INFORMATION
DESIGNCONSIDERATIONS
The L7800ASeries of fixed voltage regulatorsare
designed with Thermal Overload Protection that
shuts down the circuit when subjected to an
excessive power overload condition, Internal
Short-circuit Protection that limits the maximum
current the circuit will pass, and Output Transistor
Safe-Area Compensation that reduces the output
short-circuit current as the voltage across the
passtransistoris increased.
In many low current applications, compensation
capacitors are not required. However, it is
recommended
that
the
bypassed with a capacitor if the regulator is
regulator
input
be
connected to the power supply filter with long
wire lengths, or if the output load capacitance is
large. An input bypass capacitor should be
selected
to
provide
characteristics to insure stable operation under all
load conditions. A 0.33
μ
F or larger tantalum,
mylar, or other capacitor having low internal
impedanceat high frequenciesshouldbe chosen.
The bypasscapacitor should be mounted with the
shortest possible
leads
regulators
input
terminals.
construction techniques
minimize ground loops and lead resistance drops
sincethe regulatorhas no externalsense lead.
good
high-frequency
directly
across the
Normally
should be
good
used to
Figure 4 :
CurrentRegulator.
Figure 5 :
AdjustableOutput Regulator.
Figure 6 :
CurrentBoost Regulator.
Figure 7 :
Short-circuit Protection.
V
O
, 7.0V to 20V
V
i
– V
O
≥
2.0V
The addition of an operational amplifier allows
adjustment to higher or intermediate values while
retaining regulation characteristics. The minimum
voltage obtainable with this arrangement is 2.0V
greaterthanthe regulatorvoltage.
The circuit of figure 6 can be modified to provide
supply protectionagainst short circuit by adding a
short-circuit sense resistor, R
sc
, and an additional
PNP transistor.The current sensing PNP must be
able to handle the short-circuit current of the
three-terminal
regulator.
four-ampere plasticpower transistor is specified.
Therefore,
a
R
1
=
V
BEQ
1
I
REQ
I
Q1
β
Q1
I
O
=I
REG
+
Q
1
(
I
REG
V
BEQ
1
R
1
)
I
O
=V
XX
R
1
+
I
d
L7800AB/AC
14/17
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L7809ACD2T | PRECISION 1A REGULATORS |
| L7809ACV | PRECISION 1A REGULATORS |
| L7809ABD2T | PRECISION 1A REGULATORS |
| L7812 | positive voltage regulators |
| L7809CV | 5.0 AMP POSITIVE VOLTAGE REGULATOR |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L7809ACD2T | 功能描述:線性穩(wěn)壓器 - 標(biāo)準(zhǔn) 9.0V 1.0A Positive RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負(fù)載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
| L7809ACD2TR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Fixed Voltage Regulator |
| L7809ACD2TTR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Fixed Voltage Regulator |
| L7809ACD2T-TR | 功能描述:線性穩(wěn)壓器 - 標(biāo)準(zhǔn) 9.0V 1.0A Positive RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負(fù)載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
| L7809ACD2T-TR | 制造商:STMicroelectronics 功能描述:Voltage Regulator IC |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。