TDA8922B
2
×
50 W class-D power amplifier
Rev. 01 — 1 October 2004
Preliminary data sheet
1. General description
The TDA8922B is a high efficiency class-D audio power amplifier with very low
dissipation. The typical output power is 2
×
50 W.
The device is available in the HSOP24 power package and in the DBS23P through-hole
power package. The amplifier operates over a wide supply voltage range from
±12.5
V
to
±30
V and consumes a very low quiescent current.
2. Features
s
s
s
s
s
s
s
s
s
s
s
s
Zero dead time switching
Advanced current protection: output current limiting
Smooth start-up: no pop-noise due to DC offset
High efficiency
Operating supply voltage from
±12.5
V to
±30
V
Low quiescent current
Usable as a stereo Single-Ended (SE) amplifier or as a mono amplifier in Bridge-Tied
Load (BTL)
Fixed gain of 30 dB in Single-Ended (SE) and 36 dB in Bridge-Tied Load (BTL)
High supply voltage ripple rejection
Internal switching frequency can be overruled by an external clock
Full short-circuit proof across load and to supply lines
Thermally protected.
3. Applications
s
s
s
s
s
Television sets
Home-sound sets
Multimedia systems
All mains fed audio systems
Car audio (boosters).
Philips Semiconductors
TDA8922B
2
×
50 W class-D power amplifier
4. Quick reference data
Table 1:
Quick reference data
Conditions
Min
±12.5
no load; no filter; no
RC-snubber network
connected
R
L
= 6
Ω;
THD = 10 %;
V
P
=
±26
V
R
L
= 8
Ω;
THD = 10 %;
V
P
=
±21
V
Mono bridge-tied load configuration
P
o
output power
R
L
= 8
Ω;
THD = 10 %;
V
P
=
±21
V
-
88
-
W
-
Typ
±26
50
Max
±30
65
Unit
V
mA
Symbol Parameter
General; V
P
=
±26
V
V
P
I
q(tot)
supply voltage
total quiescent
supply current
Stereo single-ended configuration
P
o
output power
-
-
50
25
-
-
W
W
5. Ordering information
Table 2:
Ordering information
Package
Name
TDA8922BTH
TDA8922BJ
HSOP24
DBS23P
Description
plastic; heatsink small outline package; 24 leads; low
stand-off height
plastic DIL-bent-SIL power package; 23 leads
(straight lead length 3.2 mm)
Version
SOT566-3
SOT411-1
Type number
9397 750 13357
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Preliminary data sheet
Rev. 01 — 1 October 2004
2 of 32
Philips Semiconductors
TDA8922B
2
×
50 W class-D power amplifier
7. Pinning information
7.1 Pinning
OSC
IN1P
IN1M
V
DDA1
SGND1
V
SSD
24
V
DDP2
23
BOOT2 22
OUT2 21
V
SSP2
20
n.c. 19
STABI 18
V
SSP1
17
OUT1 16
BOOT1 15
V
DDP1
14
PROT 13
001aab170
1
2
3
4
5
6
7
8
9
1
2
3
4
5
V
SSA1
V
SSA2
SGND2
V
DDA2
IN2M
IN2P
MODE
OSC
IN1P
IN1M
PROT
V
DDP1
BOOT1
OUT1 10
V
SSP1
11
STABI 12
V
SSP2
13
OUT2 14
BOOT2 15
V
DDP2
16
V
SSD
17
V
SSA2
18
SGND2 19
V
DDA2
20
IN2M 21
IN2P 22
MODE 23
001aab171
TDA8922BTH
6
7
8
9
TDA8922BJ
10 V
DDA1
11 SGND1
12 V
SSA1
Fig 2. Pin configuration TDA8922BTH.
Fig 3. Pin configuration TDA8922BJ.
7.2 Pin description
Table 3:
Symbol
V
SSA2
SGND2
V
DDA2
IN2M
IN2P
MODE
OSC
IN1P
IN1M
V
DDA1
9397 750 13357
Pin description
Pin
TDA8922BTH TDA8922BJ
1
2
3
4
5
6
7
8
9
10
18
19
20
21
22
23
1
2
3
4
negative analog supply voltage for channel 2
signal ground for channel 2
positive analog supply voltage for channel 2
negative audio input for channel 2
positive audio input for channel 2
mode selection input: Standby; Mute or
Operating mode
oscillator frequency adjustment or tracking input
positive audio input for channel 1
negative audio input for channel 1
positive analog supply voltage for channel 1
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Description
Preliminary data sheet
Rev. 01 — 1 October 2004
4 of 32
Philips Semiconductors
TDA8922B
2
×
50 W class-D power amplifier
Pin description
…continued
Pin
TDA8922BTH TDA8922BJ
11
12
13
14
15
16
17
18
19
20
21
22
23
24
5
6
7
8
9
10
11
12
-
13
14
15
16
17
Description
signal ground for channel 1
negative analog supply voltage for channel 1
decoupling capacitor for protection (OCP)
positive power supply voltage for channel 1
bootstrap capacitor for channel 1
PWM output from channel 1
negative power supply voltage for channel 1
decoupling of internal stabilizer for logic supply
not connected
negative power supply voltage for channel 2
PWM output from channel 2
bootstrap capacitor for channel 2
positive power supply voltage for channel 2
negative digital supply voltage
Table 3:
Symbol
SGND1
V
SSA1
PROT
V
DDP1
BOOT1
OUT1
V
SSP1
STABI
n.c.
V
SSP2
OUT2
BOOT2
V
DDP2
V
SSD
8. Functional description
8.1 General
The TDA8922B is a two channel audio power amplifier using class-D technology.
The audio input signal is converted into a digital Pulse Width Modulated (PWM) signal via
an analog input stage and PWM modulator. To enable the output power transistors to be
driven, this digital PWM signal is applied to a control and handshake block and driver
circuits for both the high side and low side. In this way a level shift is performed from the
low power digital PWM signal (at logic levels) to a high power PWM signal which switches
between the main supply lines.
A 2nd-order low-pass filter converts the PWM signal to an analog audio signal across the
loudspeakers.
The TDA8922B one-chip class-D amplifier contains high power D-MOS switches, drivers,
timing and handshaking between the power switches and some control logic. For
protection a temperature sensor and a maximum current detector are built-in.
The two audio channels of the TDA8922B contain two PWMs, two analog feedback loops
and two differential input stages. It also contains circuits common to both channels such
as the oscillator, all reference sources, the mode functionality and a digital timing
manager.
The TDA8922B contains two independent amplifier channels with high output power, high
efficiency, low distortion and a low quiescent current. The amplifier channels can be
connected in the following configurations:
•
Mono Bridge-Tied Load (BTL) amplifier
•
Stereo Single-Ended (SE) amplifiers.
9397 750 13357
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Preliminary data sheet
Rev. 01 — 1 October 2004
5 of 32
Talking
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