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參數資料
| 型號： | GP34119 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 運動控制電子 |
| 英文描述： | LOW POWER AUDIO AMPLIFIER |
| 中文描述： | 低功耗音頻放大器 |
| 文件頁數： | 4/8頁 |
| 文件大小： | 576K |
| 代理商： | GP34119 |
4/8
ISSUED DATE :2005/02/18
Chip Disable
The Chip Disable (Pin 1) can be used to power down the IC to conserve power, or for muting, or both. When at a Logic "0" (0 V to 0.8 V),
the GP34119 is enabled for normal operation. When Pin 1 is at a Logic "1" (2.0 V to V
CC
V), the IC is disabled. If Pin 1 is open, that is
equivalent to a Logic "0", although good design practice dictates that an input should never be left open. Input impedance at Pin 1 is a
nominal 90 k
. The power supply current (when disabled) is shown in Figure 19.
Muting, defined as the change in differential gain from normal operation to muted operation, is in excess of 70 dB. The turn-off time of
the audio output, from the application of the CD signal, is <2.0 us, and turn on-time is 12 ms-15 ms. Both times are independent of C1,C2,
and V
CC
.
When the GP34119 is disabled, the voltages at FC1 and FC2 do not change as they are powered from V
CC
. The outputs, V
O1
and
V
O2
, change to a high impedance condition, removing the signal from the speaker. If signals from other sources are to be applied to the
outputs (while disabled), they must be within the range of V
CC
and Ground.
Power Dissipation
Figures 8 to 10 indicate the device dissipation (within the IC) for various combinations of V
CC
, R
L
, and load power. The maximum power
which can safely be dissipated within the GP34119 is found from the following equation: P
D
= (140
к
-T
A
)/
JA
where T
A
is the ambient
temperature; and
JA
is the package thermal resistance (100
к
/W for the standard DIP package.)
The power dissipated within the GP34119, in a given application, is found from the following equation:
P
D
= (V
CC
x I
CC
) + (I
RMS
x V
CC
) – (R
L
x I
RMS
2
) where I
CC
is obtained from Figure 19; and I
RMS
is the RMS current at the load; and R
L
is
the load resistance.
Figures 8 to 10, along with Figures 11 to 13 (distortion curves), and a peak working load current of
200 mA, define the operating range
for the GP34119. The operating range is further defined in terms of allowable load power in Figure 14 for loads of 8.0
, 16
and 32
. The
left (ascending) portion of each of the three curves is defined by the power level at which 10% distortion occurs. The center flat portion of
each curve is defined by the maximum output current capability of the GP34119. The right (descending) portion of each curve is defined
by the maximum internal power dissipation of the IC at 25
к
. At higher ambient temperatures, the maximum load power must be reduced
according to the above equations. Operating the device beyond the current and junction temperature limits will degrade long term
reliability.
Layout Considerations
Normally a snubber is not needed at the output of the GP34119, unlike many other audio amplifiers. However, the PC board layout,
stray capacitances, and the manner in which the speaker wires are configured, may dictate otherwise. Generally, the speaker wires should
be twisted tightly, and not more than a few inches in length.
Characteristics Curve
Fig 1. Turn-On Time versus C1, C2 at Power-On
Fig 2. Amplifier #1 Open Loop Gain and Phase
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