Philips TDA8928J User Manual
INTEGRATED CIRCUITS
DATA SH EET
TDA8928J
Power stage 2 x 10 or 1 x 20 W
class-D audio amplifier
Preliminary specification
Supersedes data of 2004 Feb 04
2004 May 05
Philips Semiconductors Preliminary specification
Power stage 2 x 10 or 1 x 20 W class-D
audio amplifier
CONTENTS
1 FEATURES
2 APPLICATIONS
3 GENERAL DESCRIPTION
4 QUICK REFERENCE DATA
5 ORDERING INFORMATION
6 BLOCK DIAGRAM
7 PINNING
8 FUNCTIONAL DESCRIPTION
8.1 Power stage
8.2 Protection
8.2.1 Maximum temperature
8.2.2 Maximum current
9 LIMITING VALUES
10 THERMAL CHARACTERISTICS
11 QUALITY SPECIFICATION
12 DC CHARACTERISTICS
13 AC CHARACTERISTICS
14 SWITCHING CHARACTERISTICS
TDA8928J
15 TEST AND APPLICATION INFORMATION
15.1 SE application
15.2 Package ground connection
15.3 Output power
15.4 Reference design
15.4.1 Printed-circuit board
15.4.2 Bill of materials
15.5 Curves measured in reference design
16 PACKAGE OUTLINE
17 SOLDERING
17.1 Introduction to soldering through-hole mount
packages
17.2 Soldering by dipping or by solder wave
17.3 Manual soldering
17.4 Suitability of through-hole mount IC packages
for dipping and wave soldering methods
18 DATA SHEET STATUS
19 DEFINITIONS
20 DISCLAIMERS
2004 May 05 2
Philips Semiconductors Preliminary specification
Power stage 2 x 10 or 1 x 20 W class-D
audio amplifier
1 FEATURES
• High efficiency (> 90 %)
• Supply voltage from ±7.5 V to ±30 V
• Very low quiescent current
• High output power
• Diagnostic output
• Usable as a stereo Single-Ended (SE) amplifier
• Electrostatic discharge protection (pin to pin)
• No heatsink required.
2 APPLICATIONS
• Television sets
• Home-sound sets
• Multimedia systems
• All mains fed audio systems.
TDA8928J
3 GENERAL DESCRIPTION
The TDA8928J is a switching power stage for a high
efficiency class-D audio power amplifier system.
With this power stage a compact 2 × 10 W self oscillating
digital amplifier system can be built, operating with high
efficiency and very low dissipation. No heatsink is
required. Thesystem operates over a wide supply voltage
range from ±7.5 V up to ±30 V and consumes a very low
quiescent current.
4 QUICK REFERENCE DATA
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
General
V
P
I
q(tot)
η efficiency Po= 10 W; RL=8Ω; VP= ±12.5 V − 90 − %
Stereo single-ended configuration
P
o
5 ORDERING INFORMATION
TYPE
NUMBER
TDA8928J DBS17P plastic DIL-bent-SIL power package; 17 leads (lead length 7.7 mm) SOT243-3
TDA8928ST RDBS17P plastic rectangular DIL-bent-SIL power package; 17 leads (row
supply voltage ±7.5 ±12.5 ±30 V
total quiescent current no load connected; VP= ±12.5 V − 25 45 mA
output power RL=8Ω; THD = 10 %; VP= ±12.5 V 9 10 − W
RL=16Ω; THD = 10 %; VP= ±12.5 V − 5 − W
PACKAGE
NAME DESCRIPTION VERSION
SOT577-2
spacing 2.54 mm)
2004 May 05 3
Philips Semiconductors Preliminary specification
Power stage 2 x 10 or 1 x 20 W class-D
audio amplifier
6 BLOCK DIAGRAM
handbook, full pagewidth
TDA8928J
EN1
SW1
REL1
STAB
DIAG
POWERUP
EN2
SW2
REL2
4
1
2
9
3
15
14
17
16
CONTROL
AND
HANDSHAKE
temp
TEMPERATURE SENSOR
current
CURRENT PROTECTION
CONTROL
AND
HANDSHAKE
AND
DRIVER
HIGH
DRIVER
LOW
DRIVER
HIGH
DRIVER
LOW
V
DD2VDD1
13
V
V
SS1
DD2
TDA8928J
5
6
BOOT1
7
OUT1
12
BOOT2
11
OUT2
V
Fig.1 Block diagram.
810
SS1VSS2
MGX377
2004 May 05 4
Philips Semiconductors Preliminary specification
Power stage 2 x 10 or 1 x 20 W class-D
audio amplifier
7 PINNING
SYMBOL PIN DESCRIPTION
SW1 1 digital switch input; channel 1
REL1 2 digital control output; channel 1
DIAG 3 digital open-drain output for
overtemperature and overcurrent
report
EN1 4 digital enable input; channel 1
V
DD1
BOOT1 6 bootstrap capacitor; channel 1
OUT1 7 PWM output; channel 1
V
SS1
STAB 9 decoupling internal stabilizer for
V
SS2
OUT2 11 PWM output; channel 2
BOOT2 12 bootstrap capacitor; channel 2
V
DD2
EN2 14 digital enable input; channel 2
POWERUP 15 enable input for switching on
REL2 16 digital control output; channel 2
SW2 17 digital switch input; channel 2
5 positive power supply; channel 1
8 negative power supply; channel 1
logic supply
10 negative power supply; channel 2
13 positive power supply; channel 2
internal reference sources
handbook, halfpage
POWERUP
SW1
REL1
DIAG
EN1
V
DD1
BOOT1
OUT1
V
SS1
STAB
V
SS2
OUT2
BOOT2
V
DD2
EN2
REL2
SW2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
TDA8928J
TDA8928J
MGX378
Fig.2 Pin configuration.
2004 May 05 5
Philips Semiconductors Preliminary specification
Power stage 2 x 10 or 1 x 20 W class-D
audio amplifier
8 FUNCTIONAL DESCRIPTION
The TDA8928J is a two-channel audio power amplifier
system using class-D technology.
The power stage TDA8928J is used for driving the
loudspeaker load. It performs a level shift from the
low-power digital PWM signal, at logic levels, to a
high-power PWM signal that switches between the main
supplylines. A 2nd-order low-pass filter convertsthePWM
signal into an analog audio signal across the loudspeaker.
8.1 Power stage
The power stage contains high-power DMOS switches,
drivers, timing and handshaking between the power
switches and some control logic (see Fig.1).
The following functions are available:
• Switch (pins SW1 and SW2): digital inputs; switching
from VSSto VSS+ 12 V and driving the power DMOS
switches
• Release (pins REL1 and REL2): digital outputs;
switching from VSSto VSS+ 12 V; follow pin SW1 and
SW2 with a small delay. Note: for self oscillating
applications this pin is not used
• Power-up (pin POWERUP): must be connected to a
continuous supply voltage of at least VSS+ 5 V with
respect to V
• Enable (pins EN1 and EN2): digital inputs; at a level of
VSSthe power DMOS switches are open and the PWM
outputs are floating; at a level of VSS+ 12 V the power
stage is operational
• Diagnostics (pin DIAG): digital open-drain output; pulled
down to VSS if the maximum temperature or maximum
current is exceeded.
SS
TDA8928J
8.2 Protection
Temperature and short-circuit protection sensors are
included in the TDA8928J. The diagnostic output is pulled
down to VSS in the event that the maximum current or
maximum temperature is exceeded. The system shuts
itself down when pin DIAG is connected to pins EN1 and
EN2.
8.2.1 MAXIMUM TEMPERATURE
Pin DIAG becomes LOW if the junction temperature (Tj)
exceeds 150 °C. Pin DIAG becomes HIGH again if Tj is
dropped to approximately 130 °C, so there is a hysteresis
of approximately 20 °C.
8.2.2 MAXIMUM CURRENT
When the loudspeaker terminals are short-circuited this
will be detected by the current protection. Pin DIAG
becomes LOW if theoutput current exceeds the maximum
outputcurrentof 2 A. Pin DIAG becomes HIGHagainifthe
output current drops below 2 A. The output current is
limited at the maximum current detection level when pin
DIAG is connected to pins EN1 and EN2.
2004 May 05 6
Philips Semiconductors Preliminary specification
Power stage 2 x 10 or 1 x 20 W class-D
TDA8928J
audio amplifier
9 LIMITING VALUES
In accordance with the Absolute Maximum Rate System (IEC 60134).
SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT
V
P
V
P(sc)
I
ORM
T
stg
T
amb
T
vj
V
esd(HBM)
V
esd(MM)
supply voltage −±30 V
supply voltage for
−±30 V
short-circuits across the load
repetitive peak current in
− 2A
output pins
storage temperature −55 +150 °C
ambient temperature −40 +85 °C
virtual junction temperature − 150 °C
electrostaticdischarge voltage
(HBM)
note 1
all pins with respect to VDD (class 1a) −500 +500 V
all pins with respect to VSS (class 1a) −1500 +1500 V
all pins with respect to each other
−1500 +1500 V
(class 1a)
electrostaticdischarge voltage
(MM)
note 2
all pins with respect to VDD (class B) −250 +250 V
all pins with respect to VSS (class B) −250 +250 V
all pins with respect to each other
−250 +250 V
(class B)
Notes
1. Human Body Model (HBM); Rs= 1500 Ω; C = 100 pF.
2. Machine Model(MM); Rs=10Ω; C = 200 pF; L = 0.75 µH.
10 THERMAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS VALUE UNIT
R
R
th(j-a)
th(j-c)
thermal resistance from junction to ambient in free air 40 K/W
thermal resistance from junction to case in free air 1.5 K/W
11 QUALITY SPECIFICATION
In accordance with
“SNW-FQ611”
if this device is used as an audio amplifier.
2004 May 05 7
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