AN10436 PHILIPS [NXP Semiconductors], AN10436 Datasheet - Page 5

• Manufacturer Part Number: AN10436
• Description: TDA8932B/33(B) Class-D audio amplifier
• Manufacturer: PHILIPS [NXP Semiconductors]

NXP Semiconductors
AN10436_1
Application note
1.3.1 Asymmetrical supply stereo SE configuration
1.3 Typical application circuits (simplified)
The TDA8932B/33(B) can be configured for use in either SE or BTL. The major benefits of
an SE configuration compared to a BTL configuration are cost and efficiency. This is
because:
An internal feedback network has a fixed closed loop gain of 30 dB in the SE configuration
(36 dB in the BTL configuration).
The Pulse Width Modulation (PWM) output signal has a oscillator frequency that is fixed
by either:
The pulse width will be modulated according to the input signal.
Section 3
the dimensioning of the LP output filter.
The simplified application circuit of the TDA8932B/33(B) device when operated from an
asymmetrical supply (single supply) can be seen in
incorporates three integrated half supply voltage buffers to simplify the design for an
asymmetrical supply in SE configuration. One buffer is for the reference decoupling
capacitor (C
capacitors (C
Fig 2. TDA8932B/33(B) in SE configuration
•
•
•
•
•
Only one pair of power switches is required for each channel.
Only one LP filter (inductor and film capacitor) is required for each channel.
Only two power stages for stereo in one package, therefore no heat sink required.
An internal oscillator when configured as master.
An external oscillator when configured as slave.
describes the complete application design of the TDA8932B/33(B) and includes
HVPREF
SE
) in series with the speaker.
) on HVPREF (pin 11) and two other buffers are for the two AC-couple
IN1N
IN2N 14
IN1P 2
IN2P
Rev. 01 — 12 December 2007
3
15
TDA8932B/33(B)
27
22
OUT1
OUT2
PWM
PWM
TDA8932B/33(B) Class-D audio amplifier
LP
FILTER
LP
FILTER
Figure
3. The TDA8932B/33(B)
C SE
C SE
010aaa000
AN10436
© NXP B.V. 2007. All rights reserved.
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