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參數(shù)資料
| 型號： | LM3914VX |
| 元件分類： | 顯示驅(qū)動(dòng)器 |
| 英文描述： | LED Display Driver |
| 中文描述： | LED顯示驅(qū)動(dòng)器 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 236K |
| 代理商： | LM3914VX |
Application Hints
(Continued)
PROTECTION CIRCUITRY
The protection circuits of the LM391 are very flexible and
should be tailored to the output transistor’s safe operating
area. The protection V-I characteristics, circuitry, and resis-
tor formulas are described below. The diodes from the out-
put to each supply prevent the output voltage from exceed-
ing the supplies and harming the output transistors. The out-
put will do this if the protection circuitry is activated while
driving an inductive load.
TURN-ON DELAY
It is often desirable to delay the turn-ON of the power ampli-
fier. This is easily implemented by putting a resistor in series
with a capacitor from pin 14 to ground. The value of the
Protection Circuitry with External Components
TL/H/7146–5
resistor is set to limit the current to less than 1 mA (the
absolute maximum). This resistor with the capacitor gives a
time constant of RC. The turn-ON delay is approximately 2
time constants.
Example:
Amplifier with maximum supply of 30V, like the 20W, 8
X
example in the data sheet, requiring a delay of 1 second.
Time delay
e
2 RC
R
e
Max V
a
1 mA
So:
R
e
30k. Solving for C gives 16.7
m
F. Use C
e
20
m
F with
a 30V rating.
Protection Characteristics
TL/H/7146–6
Protection Circuit Resistor Formulas (V
B
e
V
a
)
R
1
e
R
2
Type of Protection
R
E
, R
ê
R
1
, R
ê
1
R
2
, R
ê
2
R
3
, R
ê
3
Current Limit
R
E
e
w
I
L
Not Required
Short
Not Required
Single Slope SOA
Protection
R
E
e
w
I
L
V
M
b
w
w
1 k
X
Not Required
Dual Slope SOA
Protection
(V
B
e
V
a
)
R
E
e
w
I
L
R
1
e
R
2
#
V
M
b
w
w
J
1 k
X
R
3
e
R
2
D
V
a
I
ê
L
R
E
b
w
b
1
(
Note:
w
is the current limit V
BE
voltage, 650 mV. Assumptions: V
a
ll
w
, V
M
ll
w
. V
a
is the load supply voltage. V
M
is the maximum rated V
CE
of the output
transistors.
6
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| LM391 | LM391 Audio Power Driver |
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| LM393 | Dual Differential Comparators |
| LM193LB | Analog Comparator |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3914VX/NOPB | 功能描述:LED照明驅(qū)動(dòng)器 DOT/BAR DISPLAY DRVR RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| LM3915 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dot/Bar Display Driver |
| LM3915J/A+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LED Display Driver |
| LM3915N | 制造商:Texas Instruments 功能描述: 制造商:Texas Instruments 功能描述:IC LED DISPLAY DRIVER 3915 DIP18 |
| LM3915N/A+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LED Display Driver |
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