AN10436 PHILIPS [NXP Semiconductors], AN10436 Datasheet - Page 19

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

NXP Semiconductors
Table 3.
3. Design 2 x 5 W - 25 W audio amplifier (asymmetrical supply)
AN10436_1
Application note
Symbol
HVP2
V
BOOT2
OUT2
V
STAB2
STAB1
V
OUT1
BOOT1
V
HVP1
OSCIO
Exposed die
pad
DDP2
SSP2
SSP1
DDP1
Pin description
Pin
19
20
21
22
23
24
25
26
27
28
29
30
31
3.1 Output power estimation
This chapter describes a stereo amplifier reference design that is based on the
TDA8932BT or the TDA8933(B)T device of NXP Semiconductors (see the schematic
Section
asymmetrical supply (10 V to 36 V). The TDA8932BT and the TDA8933(B)T devices are
pin-to-pin compatible.
The reference PCB, when mounted with TDA8932BT (high-power version), can deliver a
continuous time output power of 2 × 15 W
maximum short time output power is equal to 2 × 25 W
The reference PCB, when mounted with TDA8933(B)T (low-power version), can deliver a
continuous time output power of 2 × 15 W
maximum short time output power is equal to 2 × 18 W
This chapter shows the most important equations that can be used as a guideline for any
design based on the TDA8932B/33(B).
The output power for the SE and the BTL configuration, just before clipping, can be
estimated through the use of these equations:
SE: P
Description
Half supply voltage buffer for the SE capacitor of output 2 (asymmetrical supply). With a
symmetrical supply, this pin should be connected to the CGND (supply ground).
Positive supply voltage for the power stage 2.
Bootstrap for the high-side driver, power stage 2.
PWM output, power stage 2.
Negative supply voltage for the power stage 2.
Decoupling of the internal 11 V regulator for power stage 2.
Decoupling of the internal 11 V regulator for power stage 1.
Negative supply voltage for the power stage 1.
PWM output, power stage 1.
Bootstrap for the high-side driver, channel 1.
Positive supply voltage for the power stage 1.
Half supply voltage buffer for the SE capacitor of output 1 (asymmetrical supply). With a
symmetrical supply, this pin should be connected to the CGND (supply ground).
Oscillator input in the slave configuration or the oscillator output in the master configuration.
Exposed die pad applicable to HTSSOP32 package only. The exposed die pad should be
connected to V
o(0.5%)
3.10). This low-cost stereo Single Ended (SE) amplifier design operates with an
=
⎛
⎝
-----------------------------------------------------------------------------------------------------------------------------------
SSD(HW)
⎛
⎝
--------------------------------------------------------- -
R
L
+
Rev. 01 — 12 December 2007
R
.
DSon
R
+
L
R
s
+
R
ESR
8 R
⋅
⎞
⎠
⋅
RMS
RMS
L
(
1 t
–
into 4 Ω (V
into 8 Ω (V
TDA8932B/33(B) Class-D audio amplifier
W min
(
)
⋅
f
RMS
RMS
osc
P
P
= 22 V) without a heat sink. The
= 31 V) without a heat sink. The
) V
⋅
into 4 Ω (V
into 8 Ω (V
P
⎞
⎠
2
P
P
AN10436
© NXP B.V. 2007. All rights reserved.
= 29 V).
= 34 V).
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