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TDA8946AJ

2 x 15 W BTL audio amplifier with DC gain control

NXP Semiconductors. 

Philips Semiconductors

TDA8946AJ

2 x 15 W BTL audio amplifier with DC gain control

At VCC = 18 V and RL = 8 Ω the measured worst-case sine-wave dissipation is 17 W;

see Figure 12. For Tj(max) = 150 °C the temperature rise - caused by the power

dissipation - is: 150 − 50 = 100 °C.

P × Rth(tot) = 100 °C

Rth(tot) = 100/17 = 5.88 K/W

Rth(h-a) = Rth(tot) − Rth(j-mb) = 5.88 − 2.5 = 3.38 K/W.

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). This allows for the use of a smaller heatsink:

P × Rth(tot) = 100 °C

Rth(tot) = 100/(0.5 × 17) = 11.76 K/W

Rth(h-a) = Rth(tot) − Rth(j-mb) = 11.76 − 2.5 = 9.26 K/W.

To increase the lifetime of the IC, Tj(max) should be reduced to 125 °C. This requires a

heatsink of approximately 6.3 K/W for music signals.

15. Test information

15.1 Quality information

The “General Quality Specification for Integrated Circuits, SNW-FQ-611D” is

applicable (ordering code 9397 750 05459).

15.1.1 Test conditions

Tamb = 25 °C; VCC = 18 V; f = 1 kHz; RL = 8 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 9 and 13.

9397 750 09434

Product data

Rev. 01 — 01 March 2002

© Koninklijke Philips Electronics N.V. 2002. All rights reserved.

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