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参数资料
| 型号： | TA8277H |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 28 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| 封装： | HZIP-25 |
| 文件页数： | 6/12页 |
| 文件大小： | 290K |
| 代理商： | TA8277H |
TA8277H
2002-02-13
3
Caution and Application Method
(Description is made only on the single channel.)
1.
Voltage Gain Adjustment
This IC has no NF (negative feedback) terminals. Therefore, the voltage gain can’t adjusted, but it makes
the device a space and total costs saver.
The voltage gain of Amp.1
: GV1 = 0 dB
The voltage gain of Amp.2A, B
: GV2 = 20 dB
The voltage gain of BLT Connection : GV (BTL) = 6 dB
Therefore, the total voltage gain is decided by expression below.
GV = GV1 + GV2 + GV (BTL) = 0 + 20 + 6 = 26 dB
2.
Stand-by SW Function (pin 4)
By means of controlling pin 4 (stand-by terminal)
to high and low, the power supply can be set to ON
and OFF. The threshold voltage of pin 4 is set at
about 3VBE (typ.), and the power supply current is
about 2
A (typ.) at the stand-by state.
Control Voltage of pin 4: VSB
Stand-by
Power
VSB (V)
ON
OFF
0~1.5
OFF
ON
3~VCC
Adjustage of Stand-by SW
(1)
Since VCC can directly be controlled to ON or OFF by the microcomputer, the switching relay can be
omitted.
(2)
Since the control current is microscopic, the switching relay of small current capacity is satisfactory
for switching
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
≈ 2VBE
VCC
Power
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