TDA8950
2
×
150 W class-D power amplifier
Rev. 01 — 9 September 2008
Preliminary data sheet
1. General description
The TDA8950 is a high efficiency class-D audio power amplifier. The typical output power
is 2
×
150 W with a speaker load impedance of 4
Ω.
The TDA8950 is available in the HSOP24 power package and DBS23P power package.
The amplifier operates over a wide supply voltage range from
±12.5
V to
±40
V and
consumes a low quiescent current.
2. Features
I
Pin compatible with TDA8920B for both HSOP24 and DBS23P packages
I
Symmetrical high operating supply voltage range from
±12.5
V to
±40
V
I
Stereo full differential inputs, usable as stereo Single-Ended (SE) or mono Bridge-Tied
Load (BTL) amplifier
I
High output power at typical applications:
N
SE 2
×
150 W, R
L
= 4
Ω
(V
P
=
±37
V)
N
SE 2
×
170 W, R
L
= 4
Ω
(V
P
=
±39
V)
N
SE 2
×
100 W, R
L
= 6
Ω
(V
P
=
±37
V)
N
BTL 1
×
300 W, R
L
= 8
Ω
(V
P
=
±37
V)
I
Low noise in BTL due to BD-modulation
I
Smooth pop noise-free start-up and switch down
I
Zero dead time Pulse Width Modulation (PWM) output switching
I
Fixed frequency
I
Internal or external clock switching frequency
I
High efficiency
I
Low quiescent current
I
Advanced protection strategy: voltage protection and output current limiting
I
Thermal foldback
I
Fixed gain of 30 dB in SE and 36 dB in BTL
I
Full short-circuit proof across load
3. Applications
I
I
I
I
DVD
Mini and micro receiver
Home Theater In A Box (HTIAB) system
High power speaker system
NXP Semiconductors
TDA8950
2
×
150 W class-D power amplifier
4. Quick reference data
Table 1.
Quick reference data
Conditions
Min
Typ
Max
±40
90
75
Unit
V
V
mA
Symbol Parameter
General, V
P
=
±35
V
V
P
V
P(ovp)
I
q(tot)
supply voltage
overvoltage protection
supply voltage
total quiescent current
non-operating; V
DD
−
V
SS
Operating mode; no load;
no filter; no RC-snubber
network connected
R
L
= 4
Ω;
THD = 10 %;
V
P
=
±39
V
R
L
= 4
Ω;
THD = 10 %;
V
P
=
±37
V
R
L
= 6
Ω;
THD = 10 %;
V
P
=
±37
V
Mono bridge-tied load configuration
P
o
output power
R
L
= 8
Ω;
THD = 10 %;
V
P
=
±37
V
-
300
-
W
±12.5 ±35
85
-
-
50
Stereo single-ended configuration
P
o
output power
-
-
-
170
150
100
-
-
-
W
W
W
5. Ordering information
Table 2.
Ordering information
Package
Name
TDA8950J
TDA8950TH
DBS23P
HSOP24
Description
plastic, heatsink small outline package; 24 leads; low stand-off height
Version
SOT566-3
plastic DIL-bent-SIL power package; 23 leads (straight lead length 3.2 mm) SOT411-1
Type number
TDA8950_1
© NXP B.V. 2008. All rights reserved.
Preliminary data sheet
Rev. 01 — 9 September 2008
2 of 39
NXP Semiconductors
TDA8950
2
×
150 W class-D power amplifier
6. Block diagram
VDDA
3 (20)
n.c.
10 (4)
STABI PROT
18 (12)
13 (7)
VDDP2
23 (16)
VDDP1
14 (8)
15 (9)
BOOT1
IN1M
IN1P
9 (3)
8 (2)
INPUT
STAGE
PWM
MODULATOR
SWITCH1
CONTROL
AND
HANDSHAKE
DRIVER
HIGH
16 (10)
DRIVER
LOW
V
SSP1
OSCILLATOR
MODE
MANAGER
TEMPERATURE SENSOR
CURRENT PROTECTION
VOLTAGE PROTECTION
OUT1
n.c.
OSC
MODE
11 (5)
7 (1)
6 (23)
mute
STABI
TDA8950TH
(TDA8950J)
V
DDP2
22 (15)
BOOT2
SGND
2 (19)
mute
CONTROL
AND
HANDSHAKE
DRIVER
HIGH
21 (14)
DRIVER
LOW
17 (11)
20 (13)
OUT2
IN2P
IN2M
5 (22)
4 (21)
INPUT
STAGE
PWM
MODULATOR
SWITCH2
1 (18)
12 (6)
24 (17)
19 (-)
001aah653
VSSA
n.c.
VSSD
n.c.
VSSP1
VSSP2
The pin numbers in parenthesis refer to type number TDA8950J.
Fig 1.
Block diagram
TDA8950_1
© NXP B.V. 2008. All rights reserved.
Preliminary data sheet
Rev. 01 — 9 September 2008
3 of 39
NXP Semiconductors
TDA8950
2
×
150 W class-D power amplifier
7. Pinning information
7.1 Pinning
OSC
IN1P
IN1M
n.c.
n.c.
n.c.
PROT
VDDP1
BOOT1
1
2
3
4
5
6
7
8
9
OUT1 10
VSSP1 11
VSSD 24
VDDP2 23
BOOT2 22
OUT2 21
VSSP2 20
n.c. 19
STABI 18
VSSP1 17
OUT1 16
BOOT1 15
VDDP1 14
PROT 13
001aah654
1
2
3
4
5
VSSA
SGND
VDDA
IN2M
IN2P
MODE
OSC
IN1P
IN1M
STABI 12
VSSP2 13
OUT2 14
BOOT2 15
VDDP2 16
VSSD 17
VSSA 18
SGND 19
VDDA 20
IN2M 21
IN2P 22
MODE 23
TDA8950J
TDA8950TH
6
7
8
9
10 n.c.
11 n.c.
12 n.c.
001aah655
Fig 2.
Pin configuration TDA8950TH
Fig 3.
Pin configuration TDA8950J
TDA8950_1
© NXP B.V. 2008. All rights reserved.
Preliminary data sheet
Rev. 01 — 9 September 2008
4 of 39
NXP Semiconductors
TDA8950
2
×
150 W class-D power amplifier
7.2 Pin description
Table 3.
Symbol
VSSA
SGND
VDDA
IN2M
IN2P
MODE
OSC
IN1P
IN1M
n.c.
n.c.
n.c.
PROT
VDDP1
BOOT1
OUT1
VSSP1
STABI
n.c.
VSSP2
OUT2
BOOT2
VDDP2
VSSD
Pin description
Pin
TDA8950TH TDA8950J
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
18
19
20
21
22
23
1
2
3
4
5
6
7
8
9
10
11
12
-
13
14
15
16
17
negative analog supply voltage
signal ground
positive analog supply voltage
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
not connected
not connected
not connected
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
Description
8. Functional description
8.1 General
The TDA8950 is a two-channel audio power amplifier using class-D technology.
The audio input signal is converted into a digital pulse width modulated signal via an
analog input stage and PWM modulator, see
Figure 1.
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 that switches between the main supply lines.
A 2nd-order low-pass filter converts the PWM signal to an analog audio signal across the
loudspeakers.
TDA8950_1
© NXP B.V. 2008. All rights reserved.
Preliminary data sheet
Rev. 01 — 9 September 2008
5 of 39
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