TFA9841J NXP Semiconductors, TFA9841J Datasheet - Page 5

• 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
8.4 Supply voltage ripple rejection
8.5 Built-in protection circuits
Standby — The current consumption is very low and the output is floating. The
device is in standby mode when V
Mute — The amplifier is DC-biased but not operational (no audio output). This allows
the input coupling capacitors to be charged to avoid pop-noise. The device is in mute
mode when 4.5 V < V
On — The amplifier is operating normally. The operating mode is activated at
V
The supply voltage ripple rejection (SVRR) is measured with an electrolytic capacitor
of 150 F on pin SVR using a bandwidth of 20 Hz to 22 kHz.
SVRR as function of the frequency. A larger capacitor value on pin SVR improves the
ripple rejection behavior at the lower frequencies.
The TFA9841J contains two types of temperature sensors; one measures local
temperatures of the power stage and one measures the global chip temperature. At a
local temperature of the power stage of approximately 185
of approximately 150
High impedance of the output is the result. After this time period, the power stage
switches on automatically and the detection will take place again; still a too high
temperature switches off the power stage immediately. This protects the TFA9841J
against shorts to ground, to the supply voltage, across the load and too high chip
temperatures.
The protection will only be activated when necessary, so even during a short-circuit
condition, a certain amount of (pulsed) current will still be flowing through the short,
just as much as the power stage can handle without exceeding the critical
temperature level.
Fig 3. Mode selection.
MODE
> (V
CC
standby
2.0 V).
Rev. 01 — 06 February 2004
0.8
o
MODE
C, this detection circuit switches off the power stage for 2 ms.
4.5
< (V
CC
MODE
3.5 V).
mute
< 0.8 V, or when pin MODE is grounded.
1-channel audio amplifier (1 x SE)
V CC 3.5
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
V CC 2.0
o
C or a global temperature
on
Figure 10
V MODE (V)
TFA9841J
V CC
MDB797
illustrates the
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