- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄358854 > LM391 (National Semiconductor Corporation) LM391 Audio Power Driver PDF資料下載
參數(shù)資料
| 型號(hào)： | LM391 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | LM391 Audio Power Driver |
| 中文描述： | LM391音頻功率驅(qū)動(dòng)器 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 236K |
| 代理商： | LM391 |
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM39301R-3.3 | 3A Low-Voltage Low-Dropout Regulator |
| LM393 | Dual Differential Comparators |
| LM193LB | Analog Comparator |
| LM2903DP | Low power dual voltage comparator |
| LM2903DWLE | Analog Comparator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM39100 | 制造商:HTC 制造商全稱:HTC Korea TAEJIN Technology Co. 功能描述:1.5A Very L.D.O Voltage Regulator |
| LM39100_10 | 制造商:HTC 制造商全稱:HTC Korea TAEJIN Technology Co. 功能描述:1.5A Very L.D.O Voltage Regulator |
| LM39100-1.5 | 制造商:HTC 制造商全稱:HTC Korea TAEJIN Technology Co. 功能描述:1A Low-Voltage Low-Dropout Regulator |
| LM39100-1.8 | 制造商:HTC 制造商全稱:HTC Korea TAEJIN Technology Co. 功能描述:1A Low-Voltage Low-Dropout Regulator |
| LM39100-2.5 | 制造商:HTC 制造商全稱:HTC Korea TAEJIN Technology Co. 功能描述:1A Low-Voltage Low-Dropout Regulator |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。