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參數(shù)資料
| 型號： | TA7251BP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 30 W, 1 CHANNEL, AUDIO AMPLIFIER, PZFM12 |
| 封裝： | HZIP-12 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大小： | 1045K |
| 代理商： | TA7251BP |
TA7250,51BP
2002-10-30
4
4. R.R. characteristic of ripple rejection
Since the capacity of ripple capacitor of this IC is small R.R., characteristic is influenced described below.
(1) Because Cripple is small (recommended value 0.033F), the ripple components produced in the bias system
are output at the primary stage phase inversion amplifier which gain 1.
These turn into the input signals v1, v2 of the power amplifier stage.
(2) v1 and v2 are amplifier through the power stage and turned into vo1-vo2.
However, because of the BTL operation, |vo1-vo2| appear as the output ripple voltage.
Therefore, by the gain dispersion of the power stage of ch-1 and ch-2, that is by the resistance ratio
dispersion of the external feedback resistances Rf1, Rf2, R’f1, R’f2 and inside IC, R.R. characteristic is
determined.
Since the pair characteristic of the external feedback resistances ch-1 and ch-2 influences R.R.
characteristic, it is advisable to use the high precision resistance of high characteristic.
5. Capacity of ripple filter
The on / off time constant of the protector of this IC is determined by the capacity of pin(6) ripple filter terminal.
Therefore, with the capacity expansion of the ripple capacitor, the ripple rejection is improved, however, the
following two problems arise.
(1) Interruption of sound at excessive input.
(2) Reduction of the protector strength at VCC-short, GND short or out-out short. Consequently, the capacity of
the ripple capacitor is recommended to by 0.033F.
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