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參數(shù)資料
| 型號： | L7818ACP |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS |
| 中文描述： | 三端固定電壓調(diào)節(jié)器 |
| 文件頁數(shù)： | 14/18頁 |
| 文件大小： | 118K |
| 代理商： | L7818ACP |
L7800AB/AC SERIES
14/18
APPLICATION INFORMATION
DESIGN CONSIDERATION
The L7800A Series of fixed voltage regulators are
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 voltageacross the pass
transistor is increased. In many low current
applications, compensation capacitors are not
required. However, it is recommended that the
regulator input be bypassed with capacitor if the
regulator is connected to the power supply filter
with long lengths, or if theoutput loadcapacitance
is large. An input bypass capacitor should be
selected
to
provide
characteristics to insure stable operation under all
load conditions. A 0.33mF or larger tantalum,
mylar or other capacitor having low internal
impedance at high frequencies should be chosen.
The bypass capacitor should be mounted with the
shortest
possible
leads
regulators
input
terminals.
construction
techniques
minimize ground loops and lead resistance drops
since the regulator has no external sense lead.
The addition of an operational amplifier allows
adjustment to higher or intermediate values while
retaining regulation characteristics. The minimum
voltage obtained with the arrangement is 2V
greater than the regulator voltage.
The circuit of figure 6 can be modified to provide
supply protection against short circuit by adding a
short
circuit
sense
resistor,
additional PNP transistor. The current sensing
PNP must be able to handle the short circuit
current of the three terminal regulator Therefore a
four ampere plastic power transistor is specified.
good
high
frequency
directly
across
the
Normally
be
good
should
used
to
RSC,
and
an
Figure 4 :
DC Parameter
Figure 5 :
DC Parameter
Figure 6 :
DC Parameter
Figure 7 :
DC Parameter
1
I
O
=
+ I
d
V
O
, 7.0 to 20V
V
I
- V
O
≥
2.0V
R
1
=
I
REQ
-
β
Q1
1
I
O
= I
REG
+Q
1
(I
REG
)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L7820ABD2T | THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS |
| L7820ABD2TR | THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS |
| L7820ABP | THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS |
| L7820ACD2T | THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS |
| L7820ACD2TR | THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L7818ACT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Fixed Voltage Regulator |
| L7818ACV | 功能描述:線性穩(wěn)壓器 - 標準 18V 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 |
| L7818C | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:POSITIVE VOLTAGE REGULATORS |
| L7818CD2T | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:POSITIVE VOLTAGE REGULATORS |
| L7818CD2T-TR | 制造商:STMicroelectronics 功能描述:18V-1.5A VREG. - Tape and Reel |
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