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参数资料
| 型号： | TA8221ALQ |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 30 W, 2 CHANNEL, AUDIO AMPLIFIER, PSFM17 |
| 封装： | PLASTIC, HSIP-17 |
| 文件页数： | 10/16页 |
| 文件大小： | 1259K |
| 代理商： | TA8221ALQ |
TA8221AHQ / ALQ
2006-04-28
3
The total closed loop gain GV of this IC can be obtained by expression below when the closed loop voltage gain of
amp 1 is GV1.
(dB)
R2
f
R
R2)
f
(R
R1
og
20
V1
G
+
=
l
..... (1)
The closed loop voltage gain of power amp, amp 3
and amp 4 is fixed at GV3≒GV4 = 20dB.
Therefore, the total closed circuit voltage gain GV is
obtained through BTL connection by the expression
below.
GV = GV1 + GV3 + 6 (dB) ............... (2)
For example, when Rf = 0, GV is obtained by the
expressions (1) and (2) as shown below.
GV≒24 + 20 + 6 = 50dB
The voltage gain is reduced when Rf is increased. (Fig.2)
With the voltage gain reduced, since (1) the oscillation
stability is reduced, and (2) the pop noise changes when
VCC is set to on, refer to the items 3 and 4.
2. Standby SW function
By means of controlling pin(4) (standby terminal) to high
and low, the power suply can be set to on and off.
The threshold voltage of pin(4) is set at 2.1V (3VBE.),
and the power supply current is about 100A (typ.) at the
standby state.
Control voltage of pin(4): V (SB)
Stand
by
Power
V (SB) (V)
On
Off
0~2
Off
On
3~VCC
Advantage of standby SW
(1) Since VCC can directly be controlled to on / 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.
相关PDF资料 |
PDF描述 |
|---|---|
| TA8221AHQ | 30 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM17 |
| TA8221ALQ | 30 W, 2 CHANNEL, AUDIO AMPLIFIER, PSFM17 |
| TA8221AL | 30 W, 2 CHANNEL, AUDIO AMPLIFIER, PSFM17 |
| TA8221AH | 30 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM17 |
| TA8221AL | 30 W, 2 CHANNEL, AUDIO AMPLIFIER, PSFM17 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TA8223K | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:LOW FREQUENCY POWER AMPLIFIER |
| TA8224 | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:MULTI OUTPUT VOLTAGE REGULATOR FOR CD PLAYER |
| TA8224H | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:MULTI OUTPUT VOLTAGE REGULATOR FOR CD PLAYER |
| TA8225 | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:45W BTL AUDIO AMPLIFIER |
| TA8225H | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:45W BTL AUDIO AMPLIFIER |
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