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TM
FEATURES
D70-W RMS Power (BTL) Into 4 Ω With Less
Than 0.2% THD+N
D95-dB Dynamic Range (TDAA System With
TAS5026)
DPower Efficiency Greater Than 90% Into 4-Ω
and 8-Ω Loads
− Smaller Power Supplies
DSelf-Protecting Design With Autorecovery
D32-Pin TSSOP (DAD) PowerPAD Package
D3.3-V Digital Interface
DEMI-Compliant When Used With
Recommended System Design
APPLICATIONS
DDVD Receiver
DHome Theatre
DMini/Micro Component Systems
DInternet Music Appliance
DESCRIPTION
The TAS5111A is a high-performance digital amplifier
power stage designed to drive a 4-Ω speaker up to 70 W
with 0.2% distortion plus noise. The device incorporates
TI’s PurePath Digital technology and is used with a
digital audio PWM processor (TAS50XX) and a simple
passive demodulation filter to deliver high-quality,
high-efficiency digital audio amplification.
The efficiency of this digital amplifier can be greater than
90%, depending on the system design. Overcurrent
protection, overtemperature protection, and undervoltage
protection are built into the TAS5111A, safeguarding the
device and speakers against fault conditions that could
damage the system.
PO − Output Power − W
100m
RL = 4 Ω
TC = 75°C
1 10 100
0.01
0.1
1
THD+N − Total Harmonic Distortion + Noise − %
THD + NOISE vs OUTPUT POWER
f − Frequency − Hz
20 100 1k 10k
THD+N − Total Harmonic Distortion + Noise − %
0.001
0.1
1
20k
RL = 4 Ω
TC = 75°C
0.01
PO = 70 W
PO = 1 W
PO = 10 W
THD + NOISE vs FREQUENCY
PurePath Digital and PowerPAD are trademarks of Texas Instruments. Other trademarks are the property of their respective owners.
!"# $% $
! ! & ' $$ ()%
$ !* $ #) #$ * ## !%
Please b e aware that an important notice concerning availability, standard warranty , and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
www.ti.com
Copyright 2005, Texas Instruments Incorporated
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2
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during
storage o r handling to prevent electrostatic damage to the MOS gates.
GENERAL INFORMATION
Terminal Assignment
The TAS5111A is offered in a thermally enhanced 32-pin
TSSOP surface-mount package (DAD), which has the
thermal pad on top.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
PWM_BP
GND
RESET
D
REG_RTN
GREG
M3
DREG
DGND
M1
M2
DVDD
SD
DGND
OTW
GND
PWM_AP
GVDD
GND
BST_B
PVDD_
B
PVDD_
B
OUT_B
OUT_B
GND
GND
OUT_A
OUT_A
PVDD_
A
PVDD_
A
BST_A
GND
GVDD
DAD PACKAGE
(TOP VIEW)
ABSOLUTE MAXIMUM RATINGS
over o perating free-air temperature range unless otherwise noted(1)
TAS5111A UNITS
DVDD T O DGND –0.3 V to 4.2 V
GVDD T O GND 33.5 V
PVDD_X TO GND (dc voltage) 33.5 V
PVDD_X TO GND (spike voltage(2))48 V
OUT_X TO GND (dc voltage) 33.5 V
OUT_X TO GND (spike voltage(2))48 V
BST_X T O GND (dc voltage) 48 V
BST_X T O GND (spike voltage(2))53 V
GREG TO GND (3)14.2 V
PWM_XP, RESET, M1, M2, M3, SD,
OTW –0.3 V to DVDD + 0.3 V
Maximum operating junction
temperature, TJ–40°C to 150°C
Storage temperature –40°C to 125°C
(1) Stresses beyond those listed under “absolute maximum ratings”
may cause permanent damage to the device. These are stress
ratings only, and functional operation of the device at these or any
other conditions beyond those indicated under “recommended
operating conditions” is not implied. Exposure to absolute-
maximum-rated conditions for extended periods may affect device
reliability.
(2) The duration of a voltage spike should be less than 100 ns.
(3) GREG is treated as an input when the GREG pin is overdriven by
a GVDD voltage of 12 V.
PACKAGE DISSIPATION RATINGS
PACKAGE RθJC
(°C/W) RθJA
(°C/W)
32-Pin DAD TSSOP 1.69 See Note 1
(1) The TAS5111A package is thermally enhanced for conductive
cooling using an exposed metal pad area. It is impractical to use the
device with the pad exposed to ambient air as the only means for
heat dissipation.
For this reason, RθJA, a system parameter that characterizes the
thermal treatment, is provided in the Application Information section
of the data sheet. An example and discussion of typical system
RθJA values are provided in the Thermal Information section. This
example provides additional information regarding the power
dissipation ratings. This example should be used as a reference to
calculate the heat dissipation ratings for a specific application. TI
application engineering provides technical support to design
heatsinks if needed. Also, for additional general information on
PowerPad packages, see TI document SLMA002.
ORDERING INFORMATION
TAPACKAGE DESCRIPTION
0°C to 70°C TAS5111ADAD 32-pin small TSSOP
For the most current specification and package
information, see the TI Web site at www.ti.com.
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3
Terminal Functions
TERMINAL
FUNCTION(1)
DESCRIPTION
NAME NO.
FUNCTION(1)
DESCRIPTION
BST_A 19 P High-side bootstrap supply (BST), external capacitor to OUT_A required
BST_B 30 P High-side bootstrap supply (BST), external capacitor to OUT_B required
DGND 8, 13 PI/O reference ground
DREG 7 P Digital supply voltage regulator decoupling pin, capacitor connected to DREG_RTN
DREG_RTN 4 P Decoupling return pin
DVDD 11 PI/O reference supply input (3.3 V): 100 Ω to DREG
GND 2,15, 18,
24, 25,
31
PPower ground
GREG 5 P Gate drive voltage regulator decoupling pin, capacitor to GND
GVDD 17, 32 PVoltage supply to on-chip gate drive and digital supply voltage regulators
M1 9 I Mode selection pin
M2 10 I Mode selection pin
M3 6 I Mode selection pin
OTW 14 O Overtemperature warning output, open drain with internal pullup resistor, active-low
OUT_A 22, 23 OOutput, half-bridge A
OUT_B 26, 27 OOutput, half-bridge B
PVDD_A 20, 21 PPower supply input for half-bridge A
PVDD_B 28, 29 PPower supply input for half-bridge B
PWM_AP 16 I Input signal, half-bridge A
PWM_BP 1 I Input signal, half-bridge B
RESET 3 I Reset signal, active-low
SD 12 O Shutdown signal for half-bridges A and B, active-low
(1) I = input, O = Output, P = Power
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FUNCTIONAL BLOCK DIAGRAM
GREG
GVDD
GREG
DREG_RTN
Timing
Control
Gate
Drive
PWM_AP OUT_A
GND
PVDD_A
BST_A
PWM
Receiver OUT_B
GND
PVDD_B
GREG
Protection A
Protection B
PWM_BP
RESET
GREG
BST_B
DREG
To Protection
Blocks
OTW
SD
DREG
DREG_RTN
GREG
DREG
Gate
Drive
Gate
Drive
Gate
Drive
GREG
OT
Protection
UVP
PWM
Receiver
Timing
Control
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RECOMMENDED OPERATING CONDITIONS MIN TYP MAX UNIT
DVDD Digital supply (1) Relative to DGND 3 3.3 3.6 V
GVDD Supply for internal gate drive and logic
regulators Relative to GND 16 29.5 30.5 V
PVDD_x Half-bridge supply Relative to GND, RL= 4 Ω to 8 Ω0 29.5 30.5 V
TJJunction temperature 0 125 _C
(1) It is recommended for DVDD to be connected to DREG via a 100-Ω resistor.
ELECTRICAL CHARACTERISTICS
PVDD_X = 29.5 V, GVDD = 29.5 V, DVDD connected to DREG via a 100-Ω resistor, RL = 4 Ω, 8X fs = 384 kHz, unless otherwise noted
TYPICAL OVER T E M P E R ATURE
SYMBOL PARAMETER TEST CONDITIONS TA = 25°C TA = 25°C TC = 75°CTA = 40°C
to 85°CUNITS MIN/TYP/
MAX
AC PERFORMANCE, BTL Mode, 1 kHz
RL = 8 Ω, THD = 0.2%,
AES17 filter 40 W Typ
RL = 8 Ω, THD = 10%, AES17
filter 53 W Typ
Po
Output power
RL = 6 Ω, THD = 0.2%,
AES17 filter 53 W Typ
Po
Output power
RL = 6 Ω, THD = 10%, AES17
filter 68 W Typ
RL = 4 Ω, THD = 0.2%,
AES17 filter 74 W Typ
RL = 4 Ω, THD = 10%, AES17
filter 93 W Typ
Po = 1 W/ channel, RL = 4 Ω,
AES17 filter 0.05% Typ
THD+N Total harmonic
distortion + noise Po = 10 W/channel, RL = 4 Ω,
AES17 filter 0.03% Typ
distortion + noise
Po = 70 W/channel, RL = 4 Ω,
AES17 filter 0.2% Typ
VnOutput integrated
voltage noise A-weighted, mute, RL = 4 Ω,
20 Hz to 20 kHz, AES17 filter 295 µV Max
SNR Signal-to-noise ratio A-weighted, AES17 filter 95 dB Typ
DR Dynamic range f = 1 kHz, A-weighted,
AES17 filter 95 dB Typ
INTERNAL VOLTAGE REGULATOR
DREG
Voltage regulator
Io = 1 mA,
3.1
V Min
DREG
Voltage regulator
Io = 1 mA,
PVDD = 18 V−30.5 V
3.1
V Max
GREG
Voltage regulator
Io = 1.2 mA,
13.4
V Min
GREG
Voltage regulator
Io = 1.2 mA,
PVDD = 18 V−30.5 V
13.4
V Max
IGVDD GVDD supply current,
operating fS = 384 kHz, no load,
50% duty cycle 27 mA Max
IDVDD DVDD supply current,
operating fS = 384 kHz, no load 1 5 mA Max
OUTPUT STAGE MOSFETs
Ron,LS Forward on-resistance,
low side TJ = 25°C 120 132 mΩMax
Ron,HS Forward on-resistance,
high side TJ = 25°C 120 132 mΩMax
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ELECTRICAL CHARACTERISTICS
PVDD_X = 29.5 V, GVDD = 29.5 V, connected to DREG via a 100-Ω resistor, RL = 4 Ω, 8X fs = 384 kHz, unless otherwise noted
TYPICAL OVER T E M P E R ATURE
SYMBOL PARAMETER TEST CONDITIONS TA = 25°C TA = 25°C TC = 75°CTA = 40°C
to 85°CUNITS MIN/TYP/
MAX
INPUT/OUTPUT PROTECTION
Vuvp,G
Undervoltage protection
Set the DUT in normal
operation mode with all the
protections enabled. Sweep
GVDD up and down. Monitor
7.4
6.9 V Min
V
uvp,G
Undervoltage protection
limit, GVDD
GVDD up and down. Monitor
SD output. Record the
GREG reading when SD is
triggered.
7.4
7.9 V Max
OTW Overtemperature
warning 125 °CTyp
OTE Overtemperature error 150 °CTyp
OC Overcurrent protection See Note 1. 8 A Min
STA TIC DIGITAL SPECIFICATION
PWM_AP, PW M _ B P,
M1, M2, M3, SD, OTW
VIH
High-level input voltage
2 V Min
V
IH
High-level input voltage
DVDD V Max
VIL Low-level input voltage 0.8 V Max
Leakage
Input leakage current
−10 µA Min
Leakage
Input leakage current
10 µA Max
OTW/SHUTDOWN (SD)
Internally pull up R from
OTW/SD to DVDD 28 22 kΩMin
VOL Low-level output voltage IO = 4 mA 0.4 V Max
(1) To optimize device performance and prevent overcurrent (OC) protection tripping, the demodulation filter must be designed with special care. See
Demodulation Filter Design in the Application Information section of the data sheet and consider the recommended inductors and capacitors for
optimal performance. It is also important to consider PCB design and layout for optimum performance of the TAS5111A. It is recommended to
follow the TAS5026-5111KEVM (S/N 001) design and layout guidelines for best performance.
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7
SYSTEM CONFIGURATION USED FOR CHARACTERIZATION
TAS5111ADAD
VALID_1
18
17
4
13
11
10
9
8
7
PWM PROCESSOR
TAS5026
GVDD
OUT_A
GND
PVDD_A
GND
PVDD_B
PVDD_B
PVDD_A
OUT_B
28
29
31
BST_B
OUT_B
30
GND
OUT_A
32
27
25
23
26
24
BST_A
GND
GVDD
20
22
19
21
6
14
15
16
12
5
1
2
3
ERR_RCVY
10 µH
10 µH
470 nF
4.7 kΩ
1000 µF
100 nF
PWM_AP_1
PWM_AM_1
LPCB
LPCB : TRACK IN THE PCB (1 mm wide and 50 mm long)
{ Voltage suppressor diodes: 1SMA33CA T
100 nF
100 nF
100 nF
100 nF
100 Ω
1.5 Ω
1.5 Ω
100 nF
33 nF
100 nF
33 nF
100 nF
100 nF
H-Bridge
Power Supply
Gate-Drive
Power Supply
External Power Supply
4.7 kΩ
LPCB
PWM_AP
GREG
GND
M2
M1
DREG
M3
DGND
RESET
OTW
DGND
SD
DVDD
DREG_RTN
GND
PWM_BP
1.5 Ω
10 kΩ
1.5 Ω
10 kΩ
{
{
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TYPICAL CHARACTERISTICS AND SYSTEM PERFORMANCE
OF TAS5111A EVM WITH TAS5026 PROCESSOR
Figure 1
f − Frequency − Hz
20 100 1k 10k
THD+N − Total Harmonic Distortion + Noise − %
TOTAL HARMONIC DISTORTION + NOISE
vs
FREQUENCY
0.001
0.1
1
20k
RL = 4 Ω
TC = 75°C
0.01
PO = 70 W
PO = 1 W
PO = 10 W
Figure 2
f − Frequency − kHz
−160
−140
−120
−100
−80
−60
−40
−20
0
0 2 4 6 8 10121416182022
−60-dB Input
TC = 75°C
TAS5026 Front-End Device
Noise Amplitude − dBr
NOISE AMPLITUDE
vs
FREQUENCY
Figure 3
PO − Output Power − W
100m
RL = 4 Ω
TC = 75°C
1 10 100
0.01
0.1
1
THD+N − Total Harmonic Distortion + Noise − %
TOTAL HARMONIC DISTORTION + NOISE
vs
OUTPUT POWER
Figure 4
VDD − Supply Voltage − V
0
10
20
30
40
50
60
70
80
90
0 4 8 12 16 20 24 28 32
TA = 75°C
PO − Output Power − W
OUTPUT POWER
vs
H-BRIDGE VOLTAGE
RL = 6 Ω
RL = 4 Ω
RL = 8 Ω
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9
Figure 5
PO − Output Power − W
0
10
20
30
40
50
60
70
80
90
100
0 1020304050607080
f = 1 kHz
RL = 4 Ω
TC = 75°C
η
− System Output Stage Efficiency − %
SYSTEM OUTPUT STAGE EFFICIENCY
vs
OUTPUT POWER
Figure 6
PO − Output Power − W
0
2
4
6
8
10
12
14
0 1020304050607080
Ptot − Power Loss − W
POWER LOSS
vs
OUTPUT POWER
f = 1 kHz
RL = 4 Ω
TC = 75°C
Figure 7
TC − Case Temperature − °C
60
65
70
75
80
85
90
0 20 40 60 80 100 120 140
PVDD = 29.5 V
RL = 4 Ω
P
O
− Output Power − W
OUTPUT POWER
vs
CASE TEMPERATURE
Figure 8
TJ − Junction Temperature − °C
100
110
120
130
140
150
160
170
180
190
200
0 25 50 75 100 12
5
ron − On-State Resistance − mΩ
ON-STATE RESISTANCE
vs
JUNCTION TEMPERATURE
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10
THEORY OF OPERATION
POWER SUPPLIES
The power device only requires two supply voltages,
GVDD and PVDD_X.
GVDD is the gate drive supply for the device, regulated
internally down to approximately 12 V, and decoupled with
regards to board GND on the GREG pins through an
external capacitor. GREG powers both the low side and
high side via a bootstrap step-up conversion. The
bootstrap supply is charged after the first low-side turnon
pulse. Internal digital core voltage DREG is also derived
from GVDD and regulated down by internal LDRs to 3.3 V.
The gate-driver LDR can be bypassed for reducing idle
loss in the device by shorting GREG to GVDD and directly
feeding in 12 V. This can be useful in an application where
thermal conduction of heat from the device is difficult.
Bypassing th e LDR reduces dissipation by approximately
1 W at 30-V GVDD input.
PVDD_X is the H-bridge power supply pin. Two power
pins exist for each half-bridge to handle the current density.
It is important that the circuitry recommendations around
the PVDD_X pins are followed carefully both topology-
and layout-wise. For topology recommendations, see the
Typical System Configuration section. For layout
recommendations, see the reference design layout for the
TAS5111A. Following these recommendations is
important for parameters like EMI, reliability, and
performance.
POWERING UP
RESET
GVDD
PVDD_x
PWM_xP
> 1 ms > 1 ms
NOTE: PVDD should not be powered up before GVDD.
During power up when RESET is asserted LOW, all
MOSFETs are turned off and the two internal half-bridges
are in the high-impedance state (Hi-Z). The bootstrap
capacitors supplying the high-side gate drive are not
charged at this point. To comply with the click and pop
scheme and use of non-TI TDAA modulators, it is
recommended to use a 4-kΩ pulldown resistor on each
PWM output node to ground. This precharges the
bootstrap supply capacitors and discharges the output
filter capacitor (see the Typical TAS5111A Application
Configuration section).
After GVDD has been applied, it takes approximately 800
µs to fully charge the BST capacitor. Within this time,
RESET must be kept low. After approximately 1 ms, the
back-end bootstrap capacitor is charged.
RESET can now be released if the modulator is powered
up and streaming valid PWM signals to the back-end
PWM_xP. Valid means a switching PWM signal which
complies with the frequency and duty cycle ranges stated
in the Recommended Operating Conditions.
A constant HIGH dc level on the PWM_xP is not permitted,
because it would force the high-side MOSFET ON until it
eventually runs out of BST capacitor energy and might
damage the device.
An unknown state of the PWM output signals from the
modulator is not permitted, which in practice means that
the PWM processor must be powered up and initialized
before RESET is de-asserted HIGH to the back end.
POWERING DOWN
For power down of the back end, an opposite approach is
necessary. The RESET must be asserted LOW before t he
valid PWM signal is removed.
When TI TDAA modulators are used with TI TDAA back
ends, the correct timing control of RESET and PWM_xP
is performed by the modulator.
PRECAUTION
The TAS5111A must always start up in the
high-impedance (Hi-Z) state. In this state, the bootstrap
(BST) capacitor is precharged by a resistor on each PWM
output node to ground. See the system configuration. This
ensures that the back end is ready for receiving PWM
pulses, indicating either HIGH- or LOW-side turnon after
RESET is de-asserted to the back end.
With the following pulldown resistor and BST capacitor
size, the charge time is:
C = 33 nF, R = 4.7 kΩ
R× C ×5 = 775.5 µs
After GVDD has been applied, it takes approximately 800
µs to fully charge the BST capacitor. During this time,
RESET must be kept low. After approximately 1 ms, the
back-end BST is charged and ready. RESET can now be
released if the PWM modulator is ready and is streaming
valid PWM signals to the back end. Valid PWM signals are
switching PWM signals with a frequency between
350−400 kHz. A constant HIGH level on the PWM+ would
force the high-side MOSFET ON until it eventually ran out
of BST capacitor energy. Putting the device in this
condition should be avoided.
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11
In practice, this means that the DVDD-to-PWM processor
(front-end) should be stable and initialization should be
completed before RESET is de-asserted to the back end.
CONTROL I/O
Shutdown Pin: SD
The SD pin functions as an output pin and is intended for
protection-mode signaling to, for example, a controller or
other front-end device. The pin is open-drain with an
internal pullup resistor to DVDD.
The logic output is, as shown in the following table, a
combination of the device state and RESET input:
SD RESET DESCRIPTION
0 0 Not used
0 1 Device in protection mode, i.e., UVP and/or OC
and/or OT error
1(1) 0 Device set high-impedance (Hi-Z), SD forced high
1 1 Normal operation
(1) SD is pulled high when RESET is asserted low independent of chip
state (i.e., protection mode). This is desirable to maintain
compatibility with some TI PWM front ends.
Temperature Warning Pin: OTW
The OTW pin gives a temperature warning signal when
temperature exceeds the set limit. The pin is of the
open-drain type with an internal pullup resistor to DVDD.
OTW DESCRIPTION
0 Junction temperature higher than 125°C
1Junction temperature lower than 125°C
Overall Reporting
The SD pin, together with the OTW pin, gives chip state
information as described in Table 1.
Table 1. Error Signal Decoding
OTW SD DESCRIPTION
0 0 Overtemperature error (OTE)
0 1 Overtemperature warning (OTW)
1 0 Overcurrent (OC) or undervoltage (UVP) error
1 1 Normal operation, no errors/warnings
Chip Protection
The TAS5111A protection function is implemented in a
closed loop with, for example, a system controller or other
TI PWM processor (front-end) device. The TAS5111A
contains three individual systems protecting the device
against misuse. All of the error events covered result in the
output stage being set in a high-impedance state (Hi-Z) for
maximum protection of the device and connected
equipment.
The device can be recovered by toggling RESET low and
then high, after all errors are cleared.
Overcurrent (OC) Protection
The device has individual forward current protection on
both high-side and low-side power stage FETs. The OC
protection works only with the demodulation filter present
at the output. See Filter Demodulation Design in the
Application Information section of the data sheet for design
constraints.
Overtemperature (OT) Protection
A dual temperature protection system asserts a warning
signal when the device junction temperature exceeds
125°C. The OT protection circuit is shared by all
half-bridges.
Undervoltage (UV) Protection
Undervoltage lockout occurs when GVDD is insufficient
for proper device operation. The UV protection system
protects the device under power-up and power-down
situations. The UV protection circuits are shared by all
half-bridges.
Reset Function
The function of the reset input is twofold:
DReset is used for re-enabling operation after a
latching error event.
DReset is used for disabling output stage
switching (mute function).
In PMODEs where the reset input functions as the means
to re-enable operation after an error event, the error latch
is cleared on the falling edge of reset, and normal
operation is resumed when reset goes high.
PROTECTION MODE
Autorecovery (AR) After Errors (PMODE0)
In autorecovery mode (PMODE0), the TAS5111A is
self-supported in handling of error situations. All protection
systems are active, setting the output stage in the
high-impedance state to protect the output stage and
connected equipment. However, after a short time the
device autorecovers, i.e., operation is automatically
resumed provided that the system is fully operational.
The autorecovery timing is set by counting PWM input
cycles, i.e., the timing is relative to the switching frequency.
The AR system is common to both half-bridges.
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Timing and Function
The function of the autorecovery circuit is as follows:
1. An error event occurs and sets the
protection latch (output stage goes Hi-Z).
2. The counter is started.
3. After n/2 cycles, the protection latch is
cleared but the output stage remains Hi-Z
(identical to pulling RESET low).
4. After n cycles, operation is resumed
(identical to pulling RESET high) (n = 512).
Error
Protection
Latch
Shutdown
Autorecovery
SD
PWM
Counter
A
R-RESET
Figure 9. Autorecovery Function
Latching Shutdown on All Errors (PMODE1)
In latching shutdown mode, all error situations result in a
power down (output stage Hi-Z). Re-enabling can be done
by toggling the RESET pin.
All Protection Systems Disabled (PMODE2)
In PMODE2, all protection systems are disabled. This
mode is purely intended for testing and characterization
purposes and thus not recommended for normal device
operation.
MODE Pins Selection
The protection mode is selected by shorting M1/M2 to
DREG or DGND according to Table 2.
Table 2. Protection Mode Selection
M1 M2 PROTECTION MODE
0 0 Autorecovery after errors (PMODE 0)
0 1 Latching shutdown on all errors (PMODE 1)
1 0 All protection systems disabled (PMODE 2)
1 1 Reserved
The output configuration mode is selected by shorting the
M3 pin to DREG or DGND according to Table 3.
Table 3. Output Mode Selection
M3 OUTPUT MODE
0Bridge-tied load output stage (BTL)
1 Reserved
APPLICATION INFORMATION
DEMODULATION FILTER DESIGN AND
SPIKE CONSIDERATIONS
The output square wave is susceptible to overshoots
(voltage spikes). The spike characteristics depend on
many elements, including silicon design and application
design and layout. The device should be able to handle
narrow spike pulses, less than 65 ns, up to 65 volts peak.
For more detailed information, see TI application report
SLEA025.
The TDAA amplifier outputs are driven by heavy-duty
DMOS transistors in an H-bridge configuration. These
transistors are either off or fully on, which reduces the
DMOS transistor on-state resistance, R(DMOSon), and
the power dissipated in the device, thereby increasing
efficiency.
The result is a square-wave output signal with a duty cycle
that is proportional to the amplitude of the audio signal. It
is recommended that a second-order LC filter be used to
recover the audio signal. For this application, EMI is
considered important; therefore, the selected filter is the
full-output type shown in Figure 10.
Output A
C1A
TAS51xx
L
Output B L
C1B
C2
R(Load)
Figure 10. Demodulation Filter
The main purpose of the output filter is to attenuate the
high-frequency switching component of the TDAA
amplifier while preserving the signals in the audio band.
Design of the demodulation filter affects the performance
of the power amplifier significantly. As a result, to ensure
proper operation of the overcurrent (OC) protection circuit
and meet the device THD+N specifications, the selection
of the inductors used in the output filter must be considered
according to the following. The rule is that the inductance
should remain stable within the range of peak current seen
at maximum output power and deliver at least 5 µH of
inductance at 15 A.
SLES111 − AUGUST 2005
www.ti.com
13
If this rule is observed, the TAS5111A does not have
distortion issues due to the output inductors, and
overcurrent conditions do not occur due to inductor
saturation in the output filter.
Another p a r a meter to be considered is the idle current loss
in the inductor. This can be measured or specified as
inductor dissipation (D). The target specification for
dissipation is less than 0.05.
In general, 10-µH inductors suffice for most applications.
The frequency response of the amplifier is slightly altered
by the change in output load resistance; however, unless
tight control of frequency response is necessary (better
than 0.5 dB), it is not necessary to deviate from 10 µH.
The graph in Figure 11 displays the inductance vs current
characteristics of two inductors that are recommended f o r
use with the TAS5111A.
Figure 11. Inductance Saturation
I − Current − A
4
5
6
7
8
9
10
11
0 5 10 15
L − Inductance −
µ
H
INDUCTANCE
vs
CURRENT
DBF1310A
DASL983XX−1023
The selection of the capacitor that is placed across the
output of each inductor (C2 in Figure 10) is simple. To
complete the output filter, use a 0.47-µF capacitor with a
voltage rating at least twice the voltage applied to the
output stage (PVDD).
This capacitor should be a good quality polyester dielectric
such as a Wima MKS2-047ufd/100/10 or equivalent.
In order to minimize the EMI effect of unbalanced ripple
loss in the inductors, 0.1-µF, 50-V, SMD capacitors (X7R
or better) (C1A and C1B in Figure 10) should be added
from the output of each inductor to ground.
THERMAL INFORMATION
The thermally augmented package provided with the
TAS5111A is designed to be interfaced directly to a
heatsink using a thermal interface compound (for
example, Wakefield Engineering type 126 thermal
grease.) The heatsink then absorbs heat from the ICs and
couples it to the local air. If the heatsink is carefully
designed, this process can reach equilibrium and heat can
be continually removed from the ICs. Because of the
efficiency of the TAS5111A, heatsinks are smaller than
those required for linear amplifiers of equivalent
performance.
RθJA is a system thermal resistance from junction to
ambient a i r. A s such, it is a system parameter with roughly
the following components:
DRθJC (the thermal resistance from junction to
case, or in this instance the metal pad)
DThermal grease thermal resistance
DHeatsink thermal resistance
RθJC has been provided in the General Information
section.
The thermal grease thermal resistance can be calculated
from the exposed pad area and the thermal grease
manufacturer’s area thermal resistance (expressed in
°C-in2/W). The area thermal resistance of the example
thermal grease with a 0.001-inch thick layer is about 0.054
°C-in2/W. The approximate exposed pad area is
0.0164 in2.
Dividing the example thermal grease area resistance by
the area of the pad gives the actual resistance through the
thermal grease, 3.3 °C/W.
Heatsink thermal resistance is generally predicted by the
heatsink vendor, modeled using a continuous flow
dynamics (CFD) model, or measured.
Thus, for a single monaural IC, the system RθJA = RθJC +
thermal grease resistance + heatsink resistance.
The following table indicates modeled parameters for one
TAS5111A IC on a heatsink. The junction temperature is
set at 1 10°C in both cases while delivering 70 W RMS into
4-Ω loads with no clipping. It is assumed that the thermal
grease is about 0.001 inch thick (this is critical).
32-Pin TSSOP
Ambient temperature 25°C
Power to load 70 W
Delta T inside package 12.3°C
Delta T through thermal grease 21.1°C
Required heatsink thermal resistance 8.2°C/W
Junction temperature 110°C
System RθJA 13.2°C/W
RθJA × power dissipation 85°C
SLES111 − AUGUST 2005
www.ti.com
14
As an indication of the importance of keeping the thermal
grease layer thin, if the thermal grease layer increases to
0.002 inches thick, the required heatsink thermal
resistance changes to 2.4°C/W.
Thermal
Pad 3,91 m m
3,31 mm
4,11 mm
3,35 mm
CLICK AND POP REDUCTION
Going from nonswitching to switching operation causes a
spectral energy burst to occur within the audio bandwidth,
which is heard in the speaker as an audible click, for
instance, after having asserted RESET LH during a
system start-up.
To make this system work properly, the following design
rules must be followed when using the TAS5111A back
end:
DThe relative timing between the PWM_AP/M_x
signals and their corresponding VALID_x signal
should not be skewed by inserting delays,
because this increases the audible amplitude
level of the click.
DThe output stage must start switching from a
fully discharged output filter capacitor. Because
the output stage prior to operation is in the
high-impedance state, this is done by having a
passive pulldown resistor on each speaker
output to GND (see Typical System
Configuration).
Other things that can affect the audible click level:
DThe spectrum of the click seems to follow the
speaker impedance vs. frequency curve—the
higher the impedance, the higher the click
energy.
DCrossover filters used between woofer and
tweeter in a speaker can have high impedance
in the audio band, which should be avoided if
possible.
Another way to look at it is that the speaker impulse
response is a major contributor to how the click energy is
shaped in the audio band and how audible the click is.
The following mode transitions feature click and pop
reduction.
STATE CLICK AND
POP REDUCED
Normal(1) →Mute Yes
Mute →Normal(1) Yes
Normal(1) →Error recovery
(ERRCVY) Yes
Error recovery →Normal(1) Yes
Normal(1) →Hard Reset No
Hard Reset →Normal(1) Yes
(1) Normal = switching
REFERENCES
1. TAS5000 Digital Audio PWM Processor data
manual—TI (SLAS270)
2. True Digital Audio Amplifier TAS5001 Digital Audio
PWM Processor data sheet—TI (SLES009)
3. True Digital Audio Amplifier TAS5010 Digital Audio
PWM Processor data sheet—TI (SLAS328)
4. True Digital Audio Amplifier TAS5012 Digital Audio
PWM Processor data sheet—TI (SLES006)
5. TAS5026 Six-Channel Digital Audio PWM
Processor data manual—TI (SLES041)
6. TAS5036A Six Channel Digital Audio PWM
Processor data manual—TI (SLES061)
7. TAS3103 Digital Audio Processor With 3D Effects
data manual—TI (SLES038)
8. Digital Audio Measurements application report—TI
(SLAA114)
9. PowerPAD Thermally Enhanced Package
technical brief—TI (SLMA002)
10. System Design Considerations for True Digital
Audio Power Amplifiers application report—TI
(SLAA117)
PACKAGING INFORMATION
Orderable Device Status (1) Package
Type Package
Drawing Pins Package
Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
TAS5111ADAD ACTIVE HTSSOP DAD 32 46 Green (RoHS &
no Sb/Br) CU NIPDAU Level-3-260C-168 HR
TAS5111ADADG4 ACTIVE HTSSOP DAD 32 46 Green (RoHS &
no Sb/Br) CU NIPDAU Level-3-260C-168 HR
TAS5111ADADR ACTIVE HTSSOP DAD 32 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-3-260C-168 HR
TAS5111ADADRG4 ACTIVE HTSSOP DAD 32 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-3-260C-168 HR
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
PACKAGE OPTION ADDENDUM
www.ti.com 18-Apr-2006
Addendum-Page 1
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0 (mm) B0 (mm) K0 (mm) P1
(mm) W
(mm) Pin1
Quadrant
TAS5111ADADR HTSSOP DAD 32 2000 330.0 24.4 8.6 11.5 1.6 12.0 24.0 Q1
PACKAGE MATERIALS INFORMATION
www.ti.com 19-Mar-2008
Pack Materials-Page 1
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
TAS5111ADADR HTSSOP DAD 32 2000 346.0 346.0 41.0
PACKAGE MATERIALS INFORMATION
www.ti.com 19-Mar-2008
Pack Materials-Page 2
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