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參數(shù)資料
| 型號(hào)： | TA8221AHQ |
| 元件分類(lèi)： | 音頻／視頻放大 |
| 英文描述： | 30 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM17 |
| 封裝： | PLASTIC, HZIP-17 |
| 文件頁(yè)數(shù)： | 10/16頁(yè) |
| 文件大?。?/td> | 1259K |
| 代理商： | TA8221AHQ |
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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.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TA8221ALQ | 30 W, 2 CHANNEL, AUDIO AMPLIFIER, PSFM17 |
| 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TA8221AL | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:30W BTL x 2CH AUDIO POWER AMPLIFIER |
| TA8221ALQ | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:30W BTL 】 2Ch Audio Power Amplifier |
| TA8223K | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:LOW FREQUENCY POWER AMPLIFIER |
| TA8224 | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:MULTI OUTPUT VOLTAGE REGULATOR FOR CD PLAYER |
| TA8224H | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:MULTI OUTPUT VOLTAGE REGULATOR FOR CD PLAYER |
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