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参数资料
| 型号： | TA8252H |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 24 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| 封装： | 1.27 MM PITCH, PLASTIC, HZIP-25 |
| 文件页数： | 8/14页 |
| 文件大小： | 358K |
| 代理商： | TA8252H |
TA8252H
2002-10-30
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 = 0dB
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) = 0 + 20 + 6 = 26 dB
2. Stand-by SW function (pin(2))
By means of controlling pin(2) (stand-by terminal) to high
and low, the power supply can be set to on and off.
The threshold voltage of pin(2) is set at about 3VBE (typ.),
and the power supply current is about 2A (typ.) at the
stand-by state.
Control voltage of pin(2): V (SB)
Stand
-by
Power
V (SB) (V)
On
Off
0~1.5
Off
On
3~6
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
+
+
+
(Fig.1) Block diagram
Amp. 2B
Amp. 2A
Amp. 1
Input
2
VCC
≈2VBE
10k
Power
ON
OFF
(Fig.2) With pin(2) set to High,
Power is turned ON
to Bias
cutting circuit
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