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參數(shù)資料
| 型號： | TDA8942P/N1,112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.5 W, 2 CHANNEL, AUDIO AMPLIFIER, PDIP16 |
| 封裝： | 0.300 INCH, PLASTIC, SOT-38-1, MO-001, DIP-16 |
| 文件頁數(shù)： | 19/22頁 |
| 文件大小： | 394K |
| 代理商： | TDA8942P/N1,112 |
Philips Semiconductors
TDA8942P
2 x 1.5 W (3 W music power) stereo BTL audio amplier
Product data
Rev. 03 — 02 September 2003
6 of 22
9397 750 11707
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
8.2 Power amplier
The power amplier is a BTL amplier with an all-NPN output stage, capable of
delivering a peak output current of 2 A.
The BTL principle offers the following advantages:
Lower peak value of the supply current
Ripple frequency on the supply voltage is twice the signal frequency
No expensive DC-blocking capacitor
Good low frequency performance.
8.2.1
Output power measurement
The output power as a function of the supply voltage is measured on the output pins
at THD = 10 %; see Figure 8. The maximum output power is limited by the maximum
power dissipation in the plastic dual in-line (DIP16) package. See also Section 14.3 .
8.2.2
Headroom
Typical CD music requires at least 12 dB (factor 15.85) dynamic headroom –
compared to the average power output – for transferring the loudest parts without
Average Listening Level (ALL) – music power – without any distortion yields:
Po(ALL) = 1 W/15.85 = 63 mW.
The power dissipation can be derived from Figure 11 for 0 dB respectively 12 dB
headroom.
For the average listening level a power dissipation of 1.15 W can be used for
Table 4 shows the power rating as a function of headroom for peak music power into
2 channels for both 1 W and 3 W.
8.3 Mode selection
The TDA8942P has three functional modes, which can be selected by applying the
levels, which depend on the supply voltage level. The MODE pin can be driven by a
3-state logic output stage e.g. a microcontroller with additional components for
DC-level shifting.
Table 4:
Power rating as function of headroom
Headroom
Power output (THD = 1 %)
Power dissipation (P)
1 W peak music power
0dB
Po = 1 W
2.35 W
12 dB
Po(ALL) = 63 mW
1.15 W
3 W peak music power
0dB
Po = 3 W
4.3 W
12 dB
Po(ALL) = 189 mW
2.17 W
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| TDA8943 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:6 W mono Bridge Tied Load BTL audio amplifier |
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