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参数资料
| 型号： | G1431R9U |
| 厂商： | Global Mixed-mode Technology Inc. |
| 元件分类： | 音频放大器 |
| 英文描述： | 2W Stereo Audio Amplifier |
| 中文描述： | 2W立体声音频放大器 |
| 文件页数： | 4/14页 |
| 文件大小： | 387K |
| 代理商： | G1431R9U |
Ver: 1.5
Oct 25, 2006
TEL: 886-3-5788833
http://www.gmt.com.tw
12
G1431
Global Mixed-mode Technology Inc.
ting impedance which is on the feedback path. CB is
the most important capacitor. Besides it is used to re-
duce the popping, CB can also determine the rate at
which the amplifier starts up during startup or recovery
from shutdown mode.
De-popping circuitry of G1431 is shown as below Fig-
ure 1. The PNP transistor limits the voltage drop
across the 120k
Ω by slewing the internal node slowly
when power is applied. At start-up, the voltage at
BYPASS capacitor is 0. The PNP is ON to pull the
mid-point of the bias circuit down. So the capacitor
sees a lower effective voltage, and thus the charging
is slower. This appears as a linear ramp (while the
PNP transistor is conducting), followed by the ex-
pected exponential ramp of an R-C circuit.
For better performance, CB is recommended to be at
least 1.5 times of input coupling capacitor CI. For ex-
ample, if using 1F input coupling capacitor, 2.2F
ceramic or tantalum low-ESR capacitors are recom-
mended to achieve the better THD performance.
Bridged-Tied Load Mode Operation
G1431 has two linear amplifiers to drive both ends of
the speaker load in Bridged-Tied Load (BTL) mode
operation. Figure 2 shows the BTL configuration. The
differential driving to the speaker load means that
when one side is slewing up, the other side is slewing
down, and vice versa. This configuration in effect will
double the voltage swing on the load as compared to a
ground reference load. In BTL mode, the peak-to-peak
voltage VO(PP) on the load will be two times than a
ground reference configuration. The voltage on the
load is doubled, this will also yield 4 times output
power on the load at the same power supply rail and
loading. Another benefit of using differential driving
configuration is that BTL operation cancels the dc off-
sets, which eliminates the dc coupling capacitor that is
needed to cancelled dc offsets in the ground reference
configuration. Low-frequency performance is then lim-
ited only by the input network and speaker responses.
Cost and PCB space can be minimized by eliminating
the dc coupling capacitors.
Shutdown mode
When the normal operation, the SHUTDOWN pin
should be held high. Pulling SHUTDOWN low will
mute the outputs and deactivate the most of the cir-
cuits. At this moment, the current of this device will be
reduced to about 160A to save the battery energy.
The SHUTDOWN pin should never be left uncon-
nected during the normal applications.
INPUT *
AMPLIFIER STATE
SHUTDOWN
OUTPUT
Low
Mute
High
BTL
* Inputs should never be left unconnected
X= do not care
Bypass
VDD
100 k
Ω
100 k
Ω
120 k
Ω
Figure 1
Bypass
VDD
100 k
Ω
100 k
Ω
120 k
Ω
Figure 1
VDD
Vo(PP)
VDD
-Vo(PP)
2xVo(PP)
RL
Figure 2
VDD
Vo(PP)
VDD
-Vo(PP)
2xVo(PP)
RL
Figure 2
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