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參數(shù)資料
| 型號(hào)： | LM3914VX |
| 元件分類(lèi)： | 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(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 236K |
| 代理商： | LM3914VX |
Application Hints
(Continued)
Since the free air thermal resistance of the MJE711,
MJE721 is 100
§
C/W, no heat sink is required. Using this
information and equation (6) we can find the minimum value
of R
E
required to prevent thermal runaway.
R
E
t
100 (30) (0.002)
30
a
1
We must now use the SOA data on the TIP42, TIP41 tran-
sistors to set up the protection circuit. Below is the SOA
curve with the 4
X
and 8
X
load lines. Also shown are the
desired protection lines. Note the value of V
B
is equal to the
supply voltage, so we use the formulas in the table.
e
0.19
X
(6)
D.C. SOA of TIP42, TIP41
Transistors
TL/H/7146–8
The data points from the curve are:
V
M
e
60V, V
B
e
23V, I
L
e
3A, I
ê
Using the dual slope protection formulas:
L
e
7A
R
E
e
0.65
3
e
0.22
X
R
2
e
1k
60
b
0.65
R
1
e
1k
#
0.65
J
&
91k
R
3
e
1k
#
23
7(0.22)
b
0.65
b
1
J
&
24k
Note that an R
E
of 0.22
X
satisfies equation (6). The final
schematic of this amplifier is below. If the output is shorted
the current will be 1.8A and V
CE
is 23V. Since the input is
AC, the average power is:
short P
D
e
(/2
(1.8) (23)
&
21W
This power is greater than was used in the heat sink calcula-
tions, so the transistors will overheat for long-duration
shorts unless a larger heat sink is used.
Typical Applications
(Continued)
20W-8
X
, 30W-4
X
Amplifier with 1 Second Turn-ON Delay
TL/H/7146–9
*
Additional protection for LM391N; Schottky diodes and R
j
100
X
.
9
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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(chēng):National Semiconductor 功能描述:Dot/Bar Display Driver |
| LM3915J/A+ | 制造商:未知廠家 制造商全稱(chēng):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(chēng):未知廠家 功能描述:LED Display Driver |
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