PAM PAM8006TR

PAM8006
10W Stereo Class-D Audio Power Amplifier
Key Features
General Description
The PAM8006 is a 10W (per channel) stereo
class-D audio amplifier with fixed gain which
offers low THD+N, low EMI, and good PSRR thus
high-quality sound reproduction.
n 10W@10%THD / Channel Output into a 8Ω
Load at 13V
n Power Supply Range: 7.5V to 18V
n Low SNR: 95dB
n Over 90% Efficiency
n With Shutdown/Mute Function
n Over Current , Thermal, Short-Circuit
Protection and UVLO
n Low THD+N
n Low Quiescent Current
n Pop noise suppression
n Small Package Outlines: Thin 32-pin QFN
5mm*5mm and TSSOP-28PP Package
n RoHS Pass and Green Package
The PAM8006 runs off from a 7.5V to 18V supply
at much higher efficiency than competitors’ICs.
The PAM8006 only requires very few external
components, significantly saving cost and board
space.
The PAM8006 is available in a 32pin QFN
5mm*5mm and TSSOP-28PP package.
Applications
n
n
n
n
n
Flat Monitor /LCD TVs
Multi-media Speaker System
DVD players, Game machines
Boom Box
Music instruments
Typical Application
1μF
1μF
1μF
10 μF
1μF
10 μF
1μF
RINN
RINP
GND
1μF
1μF
1 μF
RINN
VCLAMP
RINP
SD
GND
SHUTDOWN
1μF
V2P5
MUTE
MUTE
SHUTDOWN
AGND
AVDD
PAM8006
MUTE
AVCC
GND
GND
10μF
VCC
100nF
COSC
LINP
LINN
1 μF
1μF
220pF
LINP
GND
LINN
1 μF
1μF
10 μF
1μF
1 μF
10 μF
Power Analog Microelectronics, Inc
www.poweranalog.com
03/2011 Rev1.0
1
PAM8006
10W Stereo Class-D Audio Power Amplifier
Block Diagram
BSRN
PVCCR
Driver
100k
10k
RINN
RINP
_
-
10k
PGNDR
PAM
Modulation
+
_
+
+ -
ROUTN
BSRP
PVCCR
+
Driver
100k
ROUTP
PGNDR
Feedback
System
(x5)
osc
COSC
AVCC
AGND
VCLAMP
VCLAMP
LDO
AVDD
UVLO
SD
on/off
Depop
Thermal
Short Circuit
Protection
Biases &
References
LDO
V2P5
BSLN
MUTE
PVCCL
Driver
100k
10k
LINN
LINP
_
-
10k
+
+ -
PGNDL
BSLP
PVCCL
PAM
Modulation
+
_
+
Driver
100k
LOUTN
LOUTP
PGNDL
Feedback
System
(x5)
Power Analog Microelectronics, Inc
www.poweranalog.com
03/2011 Rev1.0
2
PAM8006
10W Stereo Class-D Audio Power Amplifier
Pin Configuration & Marking Information
Top View
5mm*5mm QFN
32
31
30
29
28
27
26
25
NC
1
24
NC
RINN
2
23
SD
RINP
3
22
AVCC
MUTE
4
21
VCLAMP
AVDD
5
20
AGND
LINP
6
19
V2P5
LINN
7
18
COSC
NC
8
17
NC
PAM8006
XATYWWLL
9
10
11
12
13
14
15
16
Top View
TSSOP-28PP (Exposed Pad)
1
28 BSRP
2
27 ROUTP
PVCCR
PGNDR
RINN
RINP
3
4
26 PVCCR
25 PGNDR
5
24
SD
6
23
AVCC
MUTE
AVDD
LINP
7
8
22 VCLAMP
21 AGND
20 V2P5
19 COSC
BSRN
ROUTN
9
LINN 10
PGNDL 11
PVCCL 12
LOUTN 13
BSLN 14
X: Internal Code
A: Assembly Code
T: Testing Code
Y: Year
WW: Week
LL: Internal Code
18 PGNDL
17 PVCCL
16 LOUTP
15 BSLP
Power Analog Microelectronics, Inc
www.poweranalog.com
03/2011 Rev1.0
3
PAM8006
10W Stereo Class-D Audio Power Amplifier
Pin Descriptions
QFN5X5
TS SOP-28
Name
Function
2
5
RINN
Negative differential audio in put for right chann el
3
6
RINP
Po sitive differential audio input for ri ght cha nnel
1,8 ,17,24
-
NC
No Conne cted
5
8
AVD D
5V A nalog V DD
4
7
MUTE
A logic high on this pin disab les the outputs and a logic low ena bles the outpu ts.
6
9
LINP
Po sitive differential audio input for left ch annel
7
10
LINN
Negative differential audio in put for left channel
9,16
11 ,18
PGNDL
Po wer ground for left channel H- bridge
1 0,15
12,17
PV CCL
Po wer sup ply for left channe l H-bridge, not connected to PVCCR o r AVCC.
11
13
LOUTN
Class-D 1/2-H-br idg e negative output for left cha nnel
12
14
BSLN
Bo otstra p I/O for left cha nnel, n egative h igh-side FET
13
15
BSLP
Bo otstra p I/O for left cha nnel, p ositive high-sid e FET
14
16
L OUTP
Class-D 1/2-H-br idg e posi tive output for left channel
18
19
COSC
22
23
AVC C
19
20
V 2P5
20
21
A GND
23
24
SD
I/O for char ge/d isch arging currents onto capacitor for ramp generator triangle
wave biased at V 2P5
High-voltage analog power sup ply (7.5V to 18V)
2.5V Re fere nce for ana log cells, as well as reference for unused au dio in put
when usin g singl e-e nded inputs.
An alog GND
Sh utdown signal for IC (low= shutdown, hi gh =oper ational). TTL logic levels with
compliance to VCC.
21
22
VCLA MP
Internally generated voltage supply b ootstrap capacitors.
2 5,32
4 ,25
P GNDR
Po wer ground for rig ht cha nnel H-br idge
2 6,31
3 ,26
PVCCR
Po wer sup ply for r ig ht channel H-b ridge, not connected to PVCCL or AVCC.
27
27
ROUTP
Class-D 1/2-H-br idg e posi tive output for right cha nnel
28
28
BSRP
Bo otstra p I/O for right channel, positive h ig h-side FET
29
1
BSRN
Bo otstra p I/O for right channel, negative high-sid e FE T
30
2
ROUTN
Class-D 1/2-H-br idg e negative output for right channel
Power Analog Microelectronics, Inc
www.poweranalog.com
03/2011 Rev1.0
4
PAM8006
10W Stereo Class-D Audio Power Amplifier
Absolute Maximum Ratings
These are stress ratings only and functional operation is not implied . Exposure to absolute
maximum ratings for prolonged time periods may affect device reliability . All voltages are with
respect to ground .
Supply Voltage V CC.............................-0.3V to 20V
Input Pin Voltage Range V I:
MUTE.................................................0V to 6.0V
SD ....................................................-0.3V to V CC
RINN,RINP,LINN,LINP......................-0.3V to 6.0V
Junction Temperature Range,TJ ......-40°C to 150 °C
Storage Temperature.....................-65 °C to150 °C
Lead Temperature1,6mm(1/16 inch) from case for
5 seconds.................................................260 °C
Recommended Operating Conditions
Supply Voltage (VCC )...........................7.5V to 18V
Maximum Volume Control Pins, Input Pins
Voltage................................................0V to 5.0V
High Level Input Voltage: SD .................2.0V to VCC
MUTE, ........ ...2.0V to 5V
Low Level Input Voltage: SD ...................0 to 0.3V
MUTE...............0 to 0.3V
Ambient Operating Temperature......-20 °C to 85 °C
Junction Temperature Range,TJ ......-40°C to 125°C
Thermal Information
Param eter
Package
Symbol
Maximum
Thermal Resistance
QFN 5mm* 5mm
θJ C
7.6
(J unction to Case)
TSSOP-28PP
θJ C
14.4
Thermal Resistance
QFN 5mm* 5mm
θJA
18.1
(Junction to Ambient)
TSSOP-28PP
θJA
27.8
Internal Power Dissipation
QFN 5mm* 5mm
PD
5.52
(T A=25°C)
TSSOP-28PP
PD
3.60
Unit
°C/W
W
The Exposed PAD must be soldered to a thermal land on the PCB.
Power Analog Microelectronics, Inc
www.poweranalog.com
03/2011 Rev1.0
5
PAM8006
10W Stereo Class-D Audio Power Amplifier
Electrical Characteristic
T A=25 °C, V CC=12V,Gv=24dB,R L=8 Ω (unless otherwise noted)
Par ameter
Supply Voltage
Continuous Output Power
Symbol
condition
V CC
Po
Quiescent Current
Supply Quiescent Current in
shutdown mode
Drain-source on-state
resistance
Power Supply Ripple Rejection
Ratio
THD+N
ICC
ISD
r ds (on)
PSRR
MAX
Units
7.5
12
18
V
5
THD+ N=1.0%,f=1kHz,RL =8Ω
8
THD+ N=10%,f=1kHz,RL =8Ω,
THD+N=10%,f=1kHz,RL =4Ω ( No t e )
Noise
TY P
THD+ N=0.1%,f=1kHz,RL =8Ω
V CC = 13 V
Total Harmonic Distortion plus
MIN
W
10
15
P O=5W, f=1kHz, RL =8Ω
0.1
(no load)
20
30
mA
SHUTDOWN=0V
4
10
µA
V CC =12V
High side
300
IO=1A
Low side
300
TA =25℃
Total
600
1V PP ripple, f=1kHz, Inputs
ac -coupled to ground
%
mΩ
-60
dB
Oscillator Frequency
fOSC
C O S C = 22 0 p F
250
k Hz
Output Integrated Noise Floor
Vn
20Hz to 22 kHz, A-weighting
-90
dB
Crosstalk
CS
P O=3W, R L =8Ω , f=1kHz
-80
dB
95
dB
Signal to Noise Ratio
Output offset voltage
SNR
Maximum output at THD+N< 0.5%,
f=1k Hz
|V OS|
INN and INP connected together
30
mV
2.5V Bias voltage
V2P5
No Load
2.5
V
Internal Analog supply Voltage
AVDD
V CC =7.5V to 18V
Over Temperature Shutdown
OTS
150
°C
Thermal Hysteresis
OTH
40
°C
(measured differentially)
5
5.5
V
Note: Heat sink is required for high power output.
Power Analog Microelectronics, Inc
www.poweranalog.com
03/2011 Rev1.0
6
PAM8006
10W Stereo Class-D Audio Power Amplifier
Typical Performance Characteristics
V CC =12V,RL =8 Ω, Gv=24dB,ΤΑ =25 °C, unless otherwise noted.
1. THD +N vs. Power
2. THD+N vs Frequency
50
10
20
5
10
2
5
%
%
2
f=1kHz
1
1
Vin=15V
f=10kHz
0. 5
Vin=12V
0. 5
f=100Hz
0. 2
0. 2
Vin=8V
0. 1
1m
2m
5m
10 m 20 m
50m 100 m
500m
1
2
5
10
0. 1
20
20
50
100
200
W
50 0
1k
2k
5k
10k
20k
1k
2k
5k
10k
20k
2k
5k
10 k
20 k
Hz
3. Power Supply Ripple Rejection
4. Noise Floor
+0
+0
-10
-10
-20
-30
-20
-40
-30
-50
-40
d
B
-60
d
B
V
-50
-60
-70
-80
-90
-100
-70
-110
-80
-120
-130
-90
-140
-100
10
20
50
100 200
500
1k
2k
5k
10k
20k
-150
20
50k 100k
50
100
200
500
Hz
Hz
5. Crosstalk
6. Frequency Response
+ 30
+0
+ 29
-10
+ 28
+ 27
-20
+ 26
-30
+ 24
-40
d
B
Cin=1uF
+ 25
d
B
r
-50
+ 23
+ 22
L to R
-60
Cin=0.47uF
A
+ 21
+ 20
-70
+ 19
+ 18
-80
R to L
Cin=0.1uF
+ 17
-90
+ 16
- 100
20
50
100
200
500
1k
2k
5k
10 k
+ 15
20
20 k
Hz
50
100
200
500
1k
Hz
Power Analog Microelectronics, Inc
www.poweranalog.com
03/2011 Rev1.0
7
PAM8006
10W Stereo Class-D Audio Power Amplifier
Typical Performance Characteristics
V CC =12V,RL =8 Ω, Gv=24dB,ΤΑ =25 °C, unless otherwise noted.
7. Efficiency vs Power
8. Quesicent Current vs Supply Voltage
100
25
90
24
80
23
70
22
60
21
50
20
40
19
30
18
20
17
10
16
0
15
0
2
4
6
8
6
10
8
10
12
14
16
18
20
Supply Voltage(V)
Output Power(mW)
Power Analog Microelectronics, Inc
www.poweranalog.com
03/2011 Rev1.0
8
PAM8006
10W Stereo Class-D Audio Power Amplifier
Test Setup for Performance Testing
PAM8006 Demo Board
Load
Audio Precision
(AP) System
Generator
AP
+OUT
Input
Low Pass
AP System
Analyzer
Filter
GND
-OUT
AUX-0025
VDD
Power Supply
Notes
1. The Audio Precision(AP) AUX-0025 low pass filter is necessary for class-D amplifier measurement
with AP analyzer.
2. Two 22µH inductors are used in series with load resistor to emulate the small speaker for effic iency
measurement.
Application Information
Power and Heat Dissipation
If the rated workable junction temperature is
1 5 0 °C , t h e r e l a t i o n s h i p b e t w e e n a m b i e n t
temperature and permitted P loss is shown in below
diagram.
Choose speakers that are able to stand large
output power from the PAM8006. Otherwise,
speaker may suffer damage.
Heat dissipation is very important when the
device works in full power operation. Two factors
affect the heat dissipation, the efficiency of the
device that determines the dissipation power, and
the thermal resistance of the package that
determines the heat dissipation capability.
10
In operation, some of power is dissipated to the
resistors.
4
9
8
7
6
5
3
2
Power Dissipation: P loss =(Po*(1- η)/ η)*2
1
0
The PAM8006’s efficiency is 90% with 10W ouput
and 8 Ω load. The dissipation power is 2.22W.
0
20
40
60
80
100
Ta
Thermal resistance of junction to ambient of the
QFN package is 18.1°C/W and the junction
temperature Tj=Ploss * θjA+Ta, where Ta is ambient
temperature. If the ambient temperature is 85°C,
the QFN’s junction temperature
From the diagram, it can be found that when the
device works at 10W/8Ω load the dissipation
power is 1.1W per channel, 2.2W total, the
permitted ambient temperature is over 100°C.
This is proven by actual test. The PAM8006 can
work in full output power under 85°C ambient
temperature.
Tj=2.22*18.1+85=125°C
w hi c h is l o we r th a n 1 5 0°C r a t ed j un c ti o n
temperature.
Power Analog Microelectronics, Inc
www.poweranalog.com
03/2011 Rev1.0
9
PAM8006
10W Stereo Class-D Audio Power Amplifier
Heat Dissipation in PCB design
Consideration for EMI
Generally, class-D amplifiers are high efficiency
and need no heat sink. For high power ones that
has high dissipation power, the heat sink may also
not necessary if the PCB is carefully designed to
achieve good heat dissipation by the PCB itself.
Filters are not required if the traces from the
amplifier to the speakers are short (<20cm). But
most applications require a ferrite bead filter as
shown in below figure. The ferrite bead filter
reduces EMI of around 1MHz and higher to meet
the FCC and CE's requirements. It is
recommended to use a ferrite bead with very low
impedances at low frequencies and high
impedance at high frequencies (above 1MHz).
Dual-Side PCB
To achieve good heat dissipation , the PCB’s
copper plate should be thicker than 0.035mm and
the copper plate on both sides of the PCB should
be utilized for heat sink.
Ferrite Bead
OUTP
The thermal pad on the bottom of the device
should be soldered to the plate of the PCB, and
via holes, usually 9 to 16, should be drilled in the
PCB area under the device and deposited copper
on the vias should be thick enough so that the
heat can be dissipated to the other side of the
plate. There should be no insulation mask on the
other side of the copper plate. It is better to drill
more vias on the PCB around the device if
possible.
OUT+
200pF
Ferrite Bead
OUTN
OUT200pF
The EMI characteristics are as follows after
employing the ferrite bead.
Vertical Polarization
4-layer PCB
If it is 4-layer PCB, the two middle layers of
grounding and power can be employed for heat
dissipation, isolating them into serval islands to
avoid short between ground and power.
Horizontal Polarization
Power Analog Microelectronics, Inc
www.poweranalog.com
03/2011 Rev1.0
10
PAM8006
10W Stereo Class-D Audio Power Amplifier
MUTE Operation
Power Supply Decoupling, C S
The MUTE pin is an input for controlling the output
state of the PAM8006. A logic high on this pin
disables the outputs and low enables the outputs.
This pin may be used as a quick disable or enable
of the outputs.
The PAM8006 is a high-performance CMOS audio
amplifier that requires adequate power supply
decoupling to ensure the output total harmonic
distortion (THD) as low as possible. Power supply
decoupling also prevents oscillations caused by
long lead between the amplifier and the speaker.
The optimum decoupling is achieved by using two
capacitors of different types that target different
types of noise on the power supply leads. For
higher frequency transients, spikes, or digital
hash on the line, a good low equivalent-seriesresistance (ESR) ceramic capacitor, typically
1µF, is recommended, placing as close as
possible to the device’s VCC lead. To filter lowerfrequency noises, a large aluminum electrolytic
capacitor of 10µF or greater is recommended,
placing near the audio power amplifier. The 10µF
capacitor also serves as a local storage capacitor
for supplying current during large signal
transients on the amplifier outputs.
For power saving, the SD pin should be used to
reduce the quiescent current to the absolute
minimum level.
Shutdown Operation
The PAM8006 employs a shutdown operation
mode to reduce supply current to the absolute
minimum level during periods of non-use to save
power. The SD input terminal should be held high
during normal operation when the amplifier is in
use. Pulling SD low causes the outputs to mute
and the amplifier to enter a low-current state. SD
should never be left unconnected to prevent the
amplifier from unpredictable operation.
BSN and BSP Capacitors
For the best power-off pop performance, the
amplifier should be set in shutdown mode prior to
removing the power supply voltage.
The full H-bridge output stages use NMOS
tra nsistors only. They therefore require bootstrap
capacitors for the high side of each output to turn
on correctly. A at least 220nF ceramic capacitor,
rated for at least 25V, must be connected from
each output to its corresponding bootstrap input.
Specifically, one 220nF capacitor mus t be
connected from xOUTP to xBSP, and another
220nF capacitor from xOUTN to xBSN. It is
recommended to use 1 μF BST capacitor to
replace 220nF (pin15, pin16, pin35 and pin36)
for lower than 100Hz applications.
Internal 2.5V Bias Generator Capacitor
Selection
The internal 2.5V bias generator (V2P5) provides
the internal bias for the preamplifier stage. The
exter nal input capa citor s and this inter nal
reference allow the inputs to be biased within the
o p t i m a l c o m m o n - m o d e r a n g e o f th e i n p u t
preamplifiers.
The selection of the capacitor value on the V2P5
terminal is critical for achieving the best device
performance. During startup or recovery from
shutdown state, the V2P5 capacitor determines
the rate at which the amplifier starts up. When the
voltage on the V2P5 capacitor equals 0.75 x
V2P5, or 75% of its final value, the device turns on
and the class-D outputs start switching. The
startup time is not critical for the best de-pop
performance since any heard pop sound is the
result of the class-D output switching-on other
than that of the startup time. However, at least a
0.47µF capacitor is recommended for the V2P5
capacitor.
Another function of the V2P5 capacitor is to filter
high frequency noise on the internal 2.5V bias
generator.
VCLAMP Capacitors
To ensure that the maximum gate-to-source
voltage for the NMOS output transistors not
exceeded, two internal regulators are used to
clamp the gate voltage. Two 1µF capacitors must
be connected from VCLAMP to ground and must
be rated for at least 25V. The voltages at the
VCLAMP terminals vary with V CC and may not be
used to power any other circuitry.
Power Analog Microelectronics, Inc
www.poweranalog.com
03/2011 Rev1.0
11
PAM8006
10W Stereo Class-D Audio Power Amplifier
R is the internal resistor and the vaule is 400kΩ
and with ± 20 % tolerance.The frequency may
varies from 200kHz to 300kHz by adjusting the
values of C OSC . The recommended value is COSC =
220pF for a switching frequency of 250kHz.
Internal Regulated 5-V Supply (AVDD)
The AVDD terminal is the output of an internallygenerated 5V supply, used for the oscillator,
preamplifier. It requires a 0.1µF to 1µF capacitor,
placed very close to the pin to Ground to keep the
regulator stable. The regulator may not be used to
power any external circuitry.
Selection of Gain and Input Signal Amplitude
The PAM8006 has two internal amplifier stages
with fixed gain. The pre-amp stage gain is 10X,
while the second stage gain is 5X.
The pre-amp is powered internally by the 5V value
of AVDD. At maximum pre-amp gain operation for
avoiding the pre-amp saturation, it's worth noting
that the peak value of input signal (Vp) shouldn't
exceed 250mV when the THD+N of PAM8006 is
lower than 1%; and the Vp value shouldn't exceed
300mV when the THD+N is lower than 10%.
Total gain is calculated as follows:
Gain=20log[100k/(10k+R IN )*5]
(RIN is external input resistor.)
Differential Input
The differential input stage of the amplifier
eliminates noises that appear on the two input
lines of the channel. To use the PAM8006 with a
differential source, connect the positive lead of
the audio source to the INP input and the negative
lead from the audio source to the INN input. To
use the PAM8006 with a single-ended source, acground the INP input through a capacitor equal in
value to the input capacitor on INN and apply the
audio source to the INN input. In a single-ended
input application, the INP input should be acgrounded at the audio source other than at the
device input for best noise performance.
Thermal Protection
Thermal protection on the PAM8006 prevents
damage to the device when the internal die
temperature exceeds 150°C. There is a ±15
degree tolerance on this trip point from device to
device. Once the die temperature exceeds the set
thermal point, the device enters into the shutdown
state and the outputs are disabled. This is not a
latched fault. The thermal fault is cleared once the
temperature of the die is reduced by 40°C. The
device begins normal operation at this point
without external system intervention.
Using low-ESR Capacitors
Low-ESR capacitors are recommended
throughout this application section. A real (with
respect to ideal) capacitor can be modeled simply
as a resistor in series with an ideal capacitor. The
voltage drop across this resistor minimizes the
beneficial effects of the capacitor in the circuit.
The lower the equivalent value of this resistance
the more the real capacitor behaves as an ideal
capacitor.
Short-circuit Protection
The PAM8006 has short circuit protection circuitry
on the outputs to prevent damage to the device
when output-to-output shorts, output-to-GND
shorts, or output-to-VCC shorts occur. Once a
short-circuit is detected on the outputs, the output
drive is immediately disabled. This is a latched
fault and must be reset by cycling the voltage on
the SD pin to a logic low and back to the logic high
state for normal operation. This will clear the
short-circuit flag and allow for normal operation if
the short was removed. If the short was not
removed, the protection circuitry will again
activate.
Selection of COSC and Frequency Setting
The switching frequency is determined by the
values of components connected to COSC and
calculated as follows:
f OSC = 22 / (Cosc*R)
Power Analog Microelectronics, Inc
www.poweranalog.com
03/2011 Rev1.0
12
PAM8006
10W Stereo Class-D Audio Power Amplifierl
Ordering Information
PAM8006 X X
Shipping Package
Package Type
Part Number
PAM8006TR
PAM8006HR
Marking
PAM8006
XATYWWLL
PAM8006
XATYWWLL
Package Type
Standard Package
QFN 5mm*5mm
3,000 units/Tape & Reel
TSSOP-28PP
2,500 units/Tape & Reel
Power Analog Microelectronics, Inc
www.poweranalog.com
03/2011 Rev1.0
13
PAM8006
10W Stereo Class-D Audio Power Amplifier
Outline Dimension
32pin QFN
Power Analog Microelectronics, Inc
www.poweranalog.com
03/2011 Rev1.0
14
PAM8006
10W Stereo Class-D Audio Power Amplifier
Outline Dimension
TSSOP-28PP
Power Analog Microelectronics, Inc
www.poweranalog.com
03/2011 Rev1.0
15