TDA8947J/N3,112 NXP Semiconductors, TDA8947J/N3,112 Datasheet - Page 18

• Manufacturer Part Number: TDA8947J/N3,112
• Description: IC AMP AUDIO PWR 29W QUAD 17SIL
• Manufacturer: NXP Semiconductors
• Type: Class ABr

Specifications of TDA8947J/N3,112

• Output Type: 4-Channel (Quad)
• Package / Case: 17-SIL (Bent and Staggered Leads)
• Max Output Power X Channels @ Load: 29W x 2 @ 8 Ohm; 14W x 4 @ 4 Ohm
• Voltage - Supply: 9 V ~ 26 V
• Features: Depop, Mute, Short-Circuit and Thermal Protection, Standby
• Mounting Type: Through Hole
• Product: Class-AB
• Output Power: 29 W
• Available Set Gain: 32 dB
• Thd Plus Noise: 0.05 %
• Operating Supply Voltage: 18 V
• Maximum Power Dissipation: 69000 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• Audio Load Resistance: 8 Ohms
• Input Signal Type: Single
• Minimum Operating Temperature: - 40 C
• Output Signal Type: Differential, Single
• Supply Type: Single
• Supply Voltage (max): 26 V
• Supply Voltage (min): 9 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 568-3458-5; 935274472112; TDA8947J

Philips Semiconductors
9397 750 14938
Product data sheet
13.3 Thermal behavior and heatsink calculation
The measured maximum thermal resistance of the IC package, R
A calculation for the heatsink can be made, with the following parameters:
R
heatsink. This can be calculated using the maximum temperature increase divided by the
power dissipation:
At V
17 W; see
dissipation, is: 150 C
This calculation 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 of 9 W (see
allows for the use of a smaller heatsink:
th(tot)
T
V
T
R
P
R
R
P
R
R
amb(max)
j(max)
CC
th(tot)
th(tot)
th(h-a)
th(tot)
th(h-a)
CC
R
R
= 18 V and R
is the total thermal resistance between the junction and the ambient including the
= 18 V and R
th(tot)
th(tot)
= 150 C (specification)
= (T
= 90/17 K/W = 5.29 K/W
= 90/9 K/W = 10 K/W
= R
= R
Figure
= 60 C (example)
= 90 C
= 90 C
j(max)
th(tot)
th(tot)
9. For T
R
R
L
T
L
= 4
amb(max)
th(j-mb)
th(j-mb)
= 4
Rev. 02 — 16 June 2005
60 C = 90 C:
j(max)
(SE)
= 5.29 K/W
= 10 K/W
(4
)/P
= 150 C the temperature raise, caused by the power
D
SE) the measured worst-case sine-wave dissipation is
1.3 K/W = 8.7 K/W
1.3 K/W = 3.99 K/W
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
4-channel audio amplifier
th(j-mb)
Section
TDA8947J
, is 1.3 K/W.
8.2.2). This
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