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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)： | 6/12頁 |
| 文件大?。?/td> | 236K |
| 代理商： | LM391 |
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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