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TDA8933B Datasheet, PDF (28/42 Pages) NXP Semiconductors – Class D audio amplifier
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NXP Semiconductors
TDA8933B
Class D audio amplifier
The pumping effect should not cause a malfunction of either the audio amplifier or the
power supply, which can also be caused by triggering of the undervoltage or overvoltage
protection of the amplifier.
Pumping effects in an SE configuration can be minimized by connecting audio inputs in
anti-phase and changing the polarity of one speaker as shown in Figure 11.
audio
in1
audio
in2
IN1P
IN1N
IN2N
IN2P
OUT1
OUT2
Fig 11. SE application for reducing pumping effect
14.9 SE curves measured in the reference design
010aaa140
102
THD+N
(%)
10
010aaa503
102
THD+N
(%)
10
010aaa504
1
1
10−1
10−2
(3)
(1)
(2)
10−1
10−2
(3)
(1)
(2)
10−3
10−2
10−1
1
10
102
Po (W/channel)
10−3
10−2
10−1
1
10
102
Po (W/channel)
a. VP = 25 V; RL = 2 × 8 Ω SE
b. VP = 17 V; RL = 2 × 4 Ω SE
(1) fi = 6 kHz
(2) fi = 1 kHz
(3) fi = 100 Hz
Fig 12. Total harmonic distortion-plus-noise as a function of output power
TDA8933B_1
Preliminary data sheet
Rev. 01 — 23 October 2008
© NXP B.V. 2008. All rights reserved.
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