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TDA8922C 데이터시트(PDF) 6 Page - NXP Semiconductors

부품명 TDA8922C
상세설명  2X75 W class-D power amplifier
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제조업체  PHILIPS [NXP Semiconductors]
홈페이지  http://www.nxp.com
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TDA8922C 데이터시트(HTML) 6 Page - NXP Semiconductors

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TDA8922C_1
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 01 — 7 September 2009
6 of 40
NXP Semiconductors
TDA8922C
2
× 75 W class-D power amplifier
The TDA8922C single-chip Class D amplifier contains high-power switches, drivers,
timing and handshaking between the power switches, along with some control logic. To
ensure maximum system robustness, an advanced protection strategy has been
implemented to provide overvoltage, overtemperature and overcurrent protection.
Each of the two audio channels contains a PWM modulator, an analog feedback loop and
a differential input stage. The TDA8922C also contains circuits common to both channels
such as the oscillator, all reference sources, the mode interface and a digital timing
manager.
The two independent amplifier channels feature high output power, high efficiency, low
distortion and low quiescent currents. They can be connected in the following
configurations:
Stereo Single-Ended (SE)
Mono Bridge-Tied Load (BTL)
The amplifier system can be switched to one of three operating modes using pin MODE:
Standby mode: featuring very low quiescent current
Mute mode: the amplifier is operational but the audio signal at the output is
suppressed by disabling the voltage-to-current (VI) converter input stages
Operating mode: the amplifier is fully operational, de-muted and can deliver an output
signal
A slowly rising voltage should be applied (e.g. via an RC network) to pin MODE to ensure
pop noise-free start-up. The bias-current setting of the (VI converter) input stages is
related to the voltage on the MODE pin.
In Mute mode, the bias-current setting of the VI converters is zero (VI converters are
disabled). In Operating mode, the bias current is at a maximum. The time constant
required to apply the DC output offset voltage gradually between Mute and Operating
mode levels can be generated using an RC network connected to pin MODE. An example
of a circuit for driving the MODE pin, optimized for optimal pop noise performance, is
shown in Figure 4. If the capacitor was omitted, the very short switching time constant
could result in audible pop noises being generated at start-up (depending on the DC
output offset voltage and loudspeaker used).
Fig 4.
Example of mode selection circuit
010aaa583
SGND
MODE
mute/
operating
10
µF
5.6 k
+5 V
470
standby/
operating
S2
S1
5.6 k
TDA8922C


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