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参数资料
| 型号： | TDA8942P/N1,112 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1.5 W, 2 CHANNEL, AUDIO AMPLIFIER, PDIP16 |
| 封装： | 0.300 INCH, PLASTIC, SOT-38-1, MO-001, DIP-16 |
| 文件页数： | 9/22页 |
| 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
17 of 22
9397 750 11707
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
14.2.2
Power supply decoupling
Proper supply bypassing is critical for low-noise performance and high supply voltage
ripple rejection. The respective capacitor locations should be as close as possible to
the device and grounded to the power ground. Proper power supply decoupling also
prevents oscillations.
For suppressing higher frequency transients (spikes) on the supply line a capacitor
with low ESR – typical 100 nF – has to be placed as close as possible to the device.
For suppressing lower frequency noise and ripple signals, a large electrolytic
capacitor – e.g. 1000
F or greater – must be placed close to the device.
The bypass capacitor on the SVR pin reduces the noise and ripple on the mid rail
voltage. For good THD and noise performance a low ESR capacitor is recommended.
14.3 Thermal behavior and Tamb(max) calculation
The measured maximum thermal resistance of the IC package, Rth(j-a) is 57 K/W.
A calculation for the maximum ambient temperature can be made, with the following
parameters:
VCC = 9 V and RL =16
Tj(max) = 150 °C
Rth(tot) is the total thermal resistance between the junction and the ambient.
At VCC = 9 V and RL =16 the measured worst-case sine-wave dissipation is
Tamb(max) = 150 – 2.35 × 57=16 °C
The calculation above is for an application at worst-case (stereo) sine-wave output
signals. In practice music signals will be applied, which decreases the maximum
power dissipation to approximately half of the sine-wave power dissipation (see
Tamb(max) = 150 – 1.15 × 57 = 84.5 °C
To increase the lifetime of the IC, Tj(max) should be reduced to 125 °C. This results in:
Tamb(max) = 125 – 1.15 × 57 = 59.5 °C
15. Test information
15.1 Quality information
The
General Quality Specication for Integrated Circuits, SNW-FQ-611 is applicable.
15.2 Test conditions
Tamb =25 °C; VCC = 9 V; f = 1 kHz; RL =16 ; audio pass band 22 Hz to 22 kHz;
unless otherwise specied. In the graphs as function of frequency no bandpass lter
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