TFA9841J NXP Semiconductors, TFA9841J Datasheet - Page 11

• Manufacturer Part Number: TFA9841J
• Description: Audio Amplifiers 1 X 7W SINGLE ENDED
• Manufacturer: NXP Semiconductors

Specifications of TFA9841J

• Product: Class-AB
• Output Power: 7.5 W
• Available Set Gain: 26 dB
• Thd Plus Noise: 0.1 %
• Operating Supply Voltage: 17 V
• Maximum Power Dissipation: 8000 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• Audio Load Resistance: 4 Ohms
• Input Signal Type: Single
• Minimum Operating Temperature: - 40 C
• Output Signal Type: Single
• Supply Type: Single
• Supply Voltage (max): 26 V
• Supply Voltage (min): 9 V
• Output Type: 1-Channel Mono
• Package / Case: DBSP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: TFA9841J/N1,112

Philips Semiconductors
9397 750 12014
Preliminary data
13.1.2 Power supply decoupling
13.2 Thermal behavior and heatsink calculation
Proper supply bypassing is critical for low-noise performance and high supply voltage
ripple rejection. The respective capacitor location 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 pin SVR reduces the noise and ripple on the mid rail
voltage. For good THD and noise performance a low ESR capacitor is recommended.
The measured maximum thermal resistance of the IC package, R
A calculation for the heatsink can be made, with the following parameters:
R
the heatsink. This can be calculated using the maximum temperature increase
divided by the power dissipation:
Fig 12. Printed-circuit board layout (single-sided); components view.
th(tot)
T
V
T
R
amb(max)
j(max)
CC
th(tot)
= 18 V and R
is the total thermal resistance between the junction and the ambient including
= 150 C (specification)
= (T
= 60 C (example)
j(max)
Rev. 01 — 06 February 2004
CIV
22
L
T
F
CIV
amb(max)
= 4
SGND
220
nF
AUDIO POWER CS NIJMEGEN
)/P
D
IN2
P
F
TFA9843J
/
3
220
nF
0
TVA
0
IN1
2
100 nF
n .
J a
7
2
1000 F
1-channel audio amplifier (1 x SE)
+V P
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
k
10
150 F
MUTE
SB ON
10 k
MODE
TFA9841J
th(j-mb)
MCE506
, is 4.0 K/W.
11 of 17