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參數(shù)資料
| 型號(hào)： | TB2901HQ |
| 廠商： | Toshiba Corporation |
| 英文描述： | Maximum Power 47 W BTL 】 4-ch Audio Power IC |
| 中文描述： | 最大功率47糯橋接】4通道音頻功率IC |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 366K |
| 代理商： | TB2901HQ |
TB2901HQ(O)
2004-10-15
3
Caution and Application Method
(Description is made 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, but it makes
the device a space and total costs saver.
The voltage gain of amp.1
The voltage gain of amp.2A, B
The voltage gain of BTL connection G
V (BTL)
=
6dB
Therefore, the total voltage gain is decided by expression below.
G
V
=
G
V1
+
G
V2
+
G
V (BTL)
=
0
+
20
+
6
=
26dB
: G
V1
=
0dB
: G
V2
=
20dB
2. Standby SW Function
(pin 4)
By means of controlling pin 4 (standby pin) to
High and Low, the power supply can be set to ON
and OFF. The threshold voltage of pin 4 is set at
about 3V
BE
(typ.), and the power supply current is
about 2
μ
A (typ.) in the standby state.
Control Voltage of Pin 4: V
SB
Standby
Power
V
SB
(V)
ON
OFF
0~1.5
OFF
ON
3.5~6 V
When changing the time constant of pin 4, check the
pop noise.
Advantage of Standby SW
(1)
Since V
CC
can directly be controlled to ON or OFF by the microcomputer, the switching relay can be
omitted.
Since the control current is microscopic, the switching relay of small current capacity is satisfactory
for switching.
(2)
Amp. 1
Input
Amp. 2A
Amp. 2B
Figure 1 Block Diagram
Figure 2 With pin 4 set to High,
Power is turned ON
ON
4
OFF
10 k
to BIAS
CUTTING CIRCUIT
≈
2 V
BE
V
CC
Power
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|---|---|
| TB2902HQ | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:Maximum Power 41 W BTL × 4-ch Audio Power IC |
| TB2903HQ | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:Maximum Power 47W BTL x 4-ch Audio Power IC |
| TB2904HQ | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:Maximum Power 43 W BTL ?4-ch Audio Power IC |
| TB2905HQ | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:Class KB High-Efficiency, Low-Frequency Power Amplifier IC Maximum Power: 47 W x 4 Channels |
| TB2905HQ(O) | 功能描述:音頻放大器 25W x 4ch Class-KB Car Pwr Amp 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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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