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參數(shù)資料
| 型號(hào)： | STA7360 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 20W BRIDGE/STEREO AUDIO AMPLIFIER WITH CLIPPING DETECTOR |
| 中文描述： | 20瓦橋/立體聲音頻放大器，具有裁剪探測(cè)器 |
| 文件頁(yè)數(shù)： | 8/18頁(yè) |
| 文件大?。?/td> | 481K |
| 代理商： | STA7360 |
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STA7360
8/18
Figure 17. Power Dissipation& Efficiency vs.
Output Power(Stereo)
Figure 18. Power Dissipation& Efficiency vs.
Output Power (Stereo)
Figure 19. Power Dissipation& Efficiency vs.
Output Power (Bridge)
BLOCK DESCRIPTION
PolarizationThe device is organized with the gain re-
sistors directly connected to the signal ground pin i.e.
without gain capacitors (fig. 20).
The non inverting inputs of the amplifiers are con-
nected to the SVR pin by means of resistor dividers,
equal to the feedback networks. This allows the out-
puts to track the SVR pin which is sufficiently slow to
avoid audible turn-on and turn-off transients.
SVR
The voltage ripple on the outputs is equal to the one
on SVR pin: with appropriate selection of CSVR,
more than 60dB of ripple rejection can be obtained.
Delayed Turn-on (muting)
The CSVR sets a signal turn-on delay too. A circuit is
included which mutes the device until the voltage on
SVR pin reaches ~2.5V typ. (fig. 22). The mute func-
tion is obtained by duplicating the input differential
pair (fig. 21): it can be switched to the signal source
or to an internal mute input. This feature is necessary
to prevent transients at the inputs reaching the loud-
speaker(s) immediately after power-on).
Fig. 22 represents the detailed turn-on transient with
reference to the stereo configuration.At the power-on
the output decoupling capacitors are charged
through an internal path but the device itself remains
switched off (phase 1 of the represented diagram).
When the outputs reach the voltage level of about 1V
(this means that there is no presence of short circuits)
the device switches on, the SVR capacitor starts
charging itself and the output tracks exactly the SVR
pin.During this phase the device is muted until the
SVR reaches the "Play" threshold (~2.5V typ.), after
that the music signal starts being played.
Stereo/Bridge Switching
There is also no need for external components for
changing from stereo to bridge configuration (figg. 20,
22). A simple short circuit between two pins allows
phase reversal at one output, yet maintaining the quies-
cent output voltage
.
Stand-by
The device is also equipped with a stand-by function,
so that a low current, and hence low cost switch, can
be used for turn on/off.
Stability
The device is provided with an internal compensation
wich allows to reach low values of closed loop gain.In
this way better performances on S/N ratio and SVR
can be obtained.
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