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參數(shù)資料
| 型號： | TB2934HQ |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 45 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| 封裝： | 1 MM PITCH, PLASTIC, HZIP-25 |
| 文件頁數(shù)： | 23/40頁 |
| 文件大?。?/td> | 574K |
| 代理商： | TB2934HQ |
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TB2934HQ
2006-04-28
3
Caution and Application Information (description is made referring only on the single
channel.)
1.
Voltage Gain Adjustment
This IC has no NF (negative feedback) Pins. Therefore, the voltage gain can not be adjusted (except by
software). However, this feature makes possible space and cost saving.
The amplifier gain, GV = 26dB, is calculated using the expression below:
The voltage gain of amp.1: GV1 = 8dB
The voltage gain of amp.2A, B: GV2 = 20dB
The voltage gain of BTL connection: GV (BTL) = 6dB
Therefore, the total voltage gain is decided by expression below.
GV = GV1 + GV2 + GV (BTL) = 8 + 20 + 6 = 34dB
In the case when GV = 20dB selected via I2C, GV1 changed from 8dB to 6dB so that the output dynamic
range is reduced as the output of Amp.1 is attenuated.
2.
Muting Time Constant and Pop Noise Suppression when VCC Rapidly Falls (pin 16)
The capacitor C4 at pin 16 is for muting time constant to
suppress the pop noise. The larger value capacitor is used,
the lower pop noise becomes but the longer the muting time
from the mute ON command sent to muting an output sound
actually. The charge period, which makes the delay of muting
after "Mute On" command is written, is MIN=30msec,
MAX=180msec in case of C4 (Pin 16) = 1 uF, Vcc=9 to 18V
and Tj = -40 to 150 degrees condition.
As the VCC is rapidly falling, the IC internal low voltage
muting operates to eliminate the large pop noise basically.
If the effect of the internal low voltage muting is not
enough in such a case, make this pin 16 set at low: 5 V and
less by external circuit for more effective to suppress the pop
noise.
In this case, this pin 16 has to be released from setting at
low before going back to play mode.
Additionally, the initial state after turning the amplifier
“ON” or after turning stand by “off” by I2C Bus is muted, so
that it is necessary to send a “mute off” command to change from this condition to play mode.
Caution on the use of the muting function
The audio muting function is enabled when pin 16 is not set Low. While the time constant of the muting
function is determined by the value of C4, the designer should take into account the possible generation of
pop noise during switching operations. The pop noise which is generated when the power or muting
function is turned ON/OFF will vary according to the time constant set by capacitor C4 value.
In the case when C4 value is large and the time constant is long, pop noise will be suppressed during the
time interval when the voltage on pin 16 is falling.
However, the pop noise may become apparent as a “peaky” sound if the mute ON or OFF command is
sent from
Controller while the voltage at pin 16 is rising.
Amp. 1
Input
Amp. 2A
Amp. 2B
Figure 1
Block Diagram
To mute circuit
From low oltage
muting circuit
16
C4
1
F
Figure 2 Pin 16 MutingCircuit
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| TB2939HQ(O) | 功能描述:音頻放大器 45W x 4-CHANNEL car power amplifer RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TB2946HQ(O) | 功能描述:音頻放大器 49W x 4-CH Class-AB car power amplifer RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TB2955HQ(O) | 功能描述:音頻放大器 45W 4-CH High-EFF car power amplifer RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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