TDA8942 데이터 시트보기 (PDF) - Philips Electronics

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TDA8942

2 x 1.5 W stereo Bridge Tied Load (BTL) audio amplifier

Philips Electronics 

Philips Semiconductors

TDA8942P

2 x 1.5 W stereo BTL audio amplifier

14.2 Thermal behaviour 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 Ω

Tj(max) = 150 °C.

Rth(tot) is the total thermal resistance between the junction and the ambient.

At VCC = 9 V and RL = 16 Ω the measured worst-case sine-wave dissipation is

2.35 W; see Figure 11. For Tj(max) = 150 °C the maximum ambient temperature 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

Section 8.2.2). For Tj(max) = 150 °C the maximum ambient temperature is:

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 Specification for Integrated Circuits, SNW-FQ-611D is

applicable.

15.2 Test conditions

Tamb = 25 °C; VCC = 9 V; f = 1 kHz; RL = 16 Ω; audio pass band 22 Hz to 22 kHz;

unless otherwise specified.

Remark: In the graphs as function of frequency no bandpass filter was applied; see

Figure 7, 12 and 13.

9397 750 06862

Product specification

Rev. 02 — 14 March 2000

© Philips Electronics N.V. 2000. All rights reserved.

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