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參數資料
| 型號： | LM2005T-S |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | LM2005 20 Watt Automotive Power Amplifier |
| 中文描述： | 12 W, 2 CHANNEL, AUDIO AMPLIFIER, PSFM11 |
| 封裝： | POWER, PLASTIC, TO-220, 11 PIN |
| 文件頁數： | 7/8頁 |
| 文件大小： | 205K |
| 代理商： | LM2005T-S |
Application Hints
The high current capability of the LM2005 allows it to contin-
uously endure either AC or DC short circuit of the output
with a maximum supply voltage of 16V. This will protect the
loudspeaker in a bridge mode, when a DC short of the out-
put occurs on one side of the speaker. The device will pre-
vent the speaker from destruction by reducing the DC
across the load (bridge mode) to typically less than 2
V
DC
(V
S
e
14.4V, R
L
e
4
X
), by an internal current pullback
method.
The LM2005 can withstand a constant 28 V
DC
on the supply
with no damage (maximum operating voltage is 18V). The
device is also protected from load dump or dangerous tran-
sients up to 40V for 50 ms (every 1000 ms) on the supply
with no damage.
Protection diodes protect the device driving inductive loads,
during which the load can generate voltages greater than
supply or less than ground levels. The protection diodes will
clamp these transients to a safe V
BE
above and below the
rails.
The bridge configuration inFigure 3 is designed for applica-
tions requiring minimal printed circuit board area and maxi-
mum cost effectiveness. The circuit will function with the
elimination of bootstrap components R3, C4 and C5 (refer
toFigure 1). This will result in less output power by decreas-
ing output voltage swing to the load. By using internal feed-
back resistors (typically 10 k
X
), feedback components R2,
R3 and C2 (Figure 1) may be omitted where closed loop
voltage gain accuracy is not critical. The net result is a sta-
ble, cost effective circuit that will satisfy many application
needs.
TL/H/5129–6
A
V
e
41.5 dB
@
1 kHz
FIGURE 3. Minimal Component Application Circuit
Component Side (Scale 2:1)
TL/H/5129–7
FIGURE 4. Printed Circuit Board Layout for LM2005
7
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