PAM PAM8006A

PAM8006A
15W Stereo Class-D Audio Power Amplifier with Power Limit
Key Features
General Description
The PAM8006A is a 15W (per channel) stereo
class-D audio amplifier which offers low THD+N
(0.2%), low EMI, and good PSRR thus highquality sound reproduction.
n
15Wx2 into a 8Ω speaker
n
Low Noise: -90dB
n
Over 90% Efficiency
n
With Shutdown/Mute Function
n
Over Current ,OVP,UVLO,Thermal and ShortCircuit Protection
n
Low THD+N
n
Power Limit with Non-clip
n
Low Quiescent Current
n
Pop noise suppression
n
Small Package Outlines: QFN5x5-32L
n
Pb-Free Package (RoHS Compliant)
The PAM8006A runs off of a 8V to 18V supply at
much higher efficiency than competitors’ Ics.
The PAM8006A only requires very few external
components, significantly saving cost and board
space.
The PAM8006A is available in a QFN5x5-32L
package.
Applications
n
Flat monitor /LCD TVS
n
Multi-media speaker System
n
DVD players, game machines
n
Boom Box
n
Music instruments
1μF
1μF
10μF
RINP
1μF
1μF
PGNDR
ROUTP
BSRP
BSRN
ROUTN
10μF
PVCCR
PGNDR
RINN
GND
PVCCR
1μF
1μF
PVCCR
GND
PVCCR
Typical Application
1μF
VCLAMP
RINN
GND
RINP
SHUTDOWN
SD
GND
1μF
MUTE
AGND
AVDD
PAM8006A
GND
1μF
MUTE
V2P5
GND
AVCC
LINN
1uF
VCC
1μF
1μF
PGNDL
10μF
GND
1μF
PVCCL
GND
1μF
PVCCL
10μF
PVCCL
BSLP
PVCCL
LOUTP
PL
BSLN
1μF
10μF
LINP
PGNDL
LINN
1μF
LOUTN
LINP
Power Analog Microelectronics,Inc
www.poweranalog.com
10/2012 Rev1.0
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PAM8006A
15W Stereo Class-D Audio Power Amplifier with Power Limit
Block Diagram
BSRN
PVCCR
Ri
-
RINN
RINP
+
_
+
-
ROUTN
Driver
Rf
PGNDR
BSRP
PVCCR
Modulation/
Power
Limit
+
_
+
Ri
Driver
Rf
ROUTP
PGNDR
Feedback
System
(x6)
AVCC
Power Limit
Reference
PL
VCLAMP
AGND
LDO
on/off
Depop
UVLO
Thermal
Short Circuit
Protection
AVDD
SD
Biases &
References
LDO
BSLN
V2P5
PVCCL
MUTE
Driver
Rf
Ri
LINN
-
LINP
+
_
+
-
PGNDL
BSLP
PVCCL
Modulation/
Power
Limit
+
_
+
LOUTN
Ri
Driver
Rf
LOUTP
PGNDL
Feedback
System
(x6)
Note:
Maximum Gain: Ri=12.5k, Rf=100k;
Power Limit Function: Ri and Rf are adjustable.
Power Analog Microelectronics,Inc
www.poweranalog.com
10/2012 Rev1.0
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PAM8006A
15W Stereo Class-D Audio Power Amplifier with Power Limit
Pin Configuration & Marking Information
PGNDR
PVCCR
ROUTN
BSRN
BSRP
ROUTP
PVCCR
PGNDR
Top View
QFN5x5-32L
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
PL
NC
8
17
NC
9
10
11
12
13
14
15
16
PGNDL
PVCCL
LOUTN
BSLN
BSLP
LOUTP
PVCCL
PGNDL
PAM8006A
XXXYWWLL
XXX: Internal Code
Y: Year
WW: Week
LL: Internal Code
Power Analog Microelectronics,Inc
www.poweranalog.com
10/2012 Rev1.0
3
PAM8006A
15W Stereo Class-D Audio Power Amplifier with Power Limit
Pin Descriptions
Pin No.
Name
Function
1,8,17,24
NC
2
RINN
Negative differential audio input for right channel
3
RINP
Positive differential audio input for right channel
4
MUTE
5
AVDD
5V Analog Supply
6
LINP
Positive differential audio input for left channel
7
LINN
Negative differential audio input for left channel
9,16
PGNDL
Power ground for left channel H-bridge
10,15
PVCCL
Power supply for left channel H-bridge, not connected to PVCCR or AVCC.
11
LOUTN
Class-D 1/2-H-bridge negative output for left channel
12
BSLN
Bootstrap I/O for left channel, negative high-side FET
13
BSLP
Bootstrap I/O for left channel, positive high-side FET
14
LOUTP
Class-D 1/2-H-bridge positive output for left channel
18
PL
19
V2P5
2.5V Reference for analog cells
20
AGND
Analog Ground
21
VCLAMP
22
AVCC
23
SD
25,32
PGNDR
26,31
PVCCR
27
ROUTP
Class-D 1/2-H-bridge positive output for right channel
28
BSRP
Bootstrap I/O for right channel, positive high-side FET
29
BSRN
Bootstrap I/O for right channel, negative high-side FET
30
ROUTN
Class-D 1/2-H-bridge negative output for right channel
33
Thermal Pad
No Connected
A logic high on this pin disables the outputs and a logic low enables the
outputs.
Reference voltage for power limit function
Internally generated voltage supply for bootstrap capacitors.
High-voltage analog power supply (8V to 26V)
Shutdown signal for IC (low= shutdown, high =operational). TTL logic levels
with compliance to VCC.
Power ground for right channel H-bridge
Power supply for right channel H-bridge, not connected to PVCCL or
AVCC.
Connect to ground. Thermal pad should be soldered down on all
applications to secure the device properly to the printed wiring board.
Power Analog Microelectronics,Inc
www.poweranalog.com
10/2012 Rev1.0
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PAM8006A
15W Stereo Class-D Audio Power Amplifier with Power Limit
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.
Junction Temperature Range,T J......-40°C to 125 °C
Storage Temperature.....................-65 °C to150 °C
Lead Temperature1,6mm(1/16 inch) from case for
5 seconds.................................................260 °C
Supply Voltage VCC...........................-0.3V to 28V
Input Voltage Range V I:
MUTE, PL............................................0V to 6.0V
SD..................................................-0.3V to VCC
RINN,RINP,LINN,LINP......................-0.3V to 6.0V
Recommended Operating Conditions
Low Level Input Voltage: SD...................0 to 0.3V
MUTE...............0 to 0.3V
Ambient Operating Temperature......-20 °C to 85 °C
Supply Voltage (VCC)....... ....................8V to 18V
Input Pin Voltage..................................0V to 5.5V
High Level Input Voltage: SD..............2.0V to VCC
MUTE. ...... ..2.0V to 5.5V
Thermal Information
Parameter
Thermal Resistance
(Junction to Case)
Thermal Resistance
(Junction to Ambient)
Package
Symbol
Maximum
QFN5x5-32L
θJC
5.0
Unit
°C/W
QFN5x5-32L
θJA
16.1
The Exposed PAD must be soldered to a thermal land on the PCB.
Power Analog Microelectronics,Inc
www.poweranalog.com
10/2012 Rev1.0
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PAM8006A
15W Stereo Class-D Audio Power Amplifier with Power Limit
Electrical Characteristic
T A=25 °C ,VCC=12V,R L=8Ω (unless otherwise noted)
Parameter
Symbol
Condition
MIN
THD+N=0.12%,f=1kHz,RL =8Ω
Continuous Output Power
Quiescent Current
Supply Quiescent Current in
shutdown mode
Drain-source on-state
resistance
Power Supply Ripple Rejection
Ratio
Po
8.5
THD+N=10%,f=1kHz,RL=8Ω
10
(no load)
ISD
SHUTDOWN=0V
PSRR
IO=0.5A
T J=25℃
W
25
mA
4
10
µA
210
Low side
210
Total
420
ac-coupled to ground
Units
16.5
High side
1VPP ripple, f=1kHz, Inputs
MAX
6
THD+N=1%,f=1kHz,RL=8Ω
IDD
rds(on)
TYP
mΩ
-65
dB
300
kHz
Oscillator Frequency
f OSC
Output Integrated Noise Floor
Vn
20Hz to 22 kHz, A-weighting
-100
dB
Crosstalk
CS
PO=3W, RL=8Ω , f=1kHz
-95
dB
90
dB
32
dB
Signal to Noise Ratio
SNR
Maximum output at THD+N<
0.5%, f=1kHz
Gain
Output offset voltage
|VOS |
INN and INP connected together
30
mV
2.5V Bias voltage
V2P5
No Load
2.5
V
Internal Analog supply Voltage
AVDD
VCC=8V to 26V
Over Temperature Shutdown
OTS
160
°C
Thermal Hysteresis
OTH
50
°C
(measured differentially)
5
5.5
V
Power Analog Microelectronics,Inc
www.poweranalog.com
10/2012 Rev1.0
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PAM8006A
15W Stereo Class-D Audio Power Amplifier with Power Limit
Electrical Characteristic
T A=25 °C ,VCC=18V,R L=8Ω (unless otherwise noted)
Parameter
Continuous Output Power
Total Harmonic Distortion plus
Noise
Quiescent Current
Supply Quiescent Current in
shutdown mode
Drain-source on-state
resistance
Power Supply Ripple Rejection
Ratio
Symbol
Po
THD+N
Condition
MIN
THD+N=0.12%,f=1kHz,RL =8Ω
2.2
THD+N=0.18%,f=1kHz,RL =8Ω
15
PO=10W,f=1kHz,RL=8Ω ,
IDD
(no load)
ISD
SHUTDOWN=0V
rds(on)
PSRR
TYP
T J=25℃
High side
210
Low side
210
Total
420
1VPP ripple, f=1kHz, Inputs
ac-coupled to ground
Units
W
0.28
18
IO=0.5A
MAX
%
25
mA
50
µA
mΩ
-65
dB
300
kHz
Oscillator Frequency
f OSC
Output Integrated Noise Floor
Vn
20Hz to 22 kHz, A-weighting
-100
dB
Crosstalk
CS
PO=3W, RL=8Ω , f=1kHz
-95
dB
90
dB
32
dB
Signal to Noise Ratio
SNR
Maximum output at THD+N<
0.5%, f=1kHz
Gain
Output offset voltage
|VOS |
INN and INP connected together
30
mV
2.5V Bias voltage
V2P5
No Load
2.5
V
Internal Analog supply Voltage
AVDD
VCC=8V to 26V
Over Temperature Shutdown
OTS
160
°C
Thermal Hysteresis
OTH
50
°C
(measured differentially)
5
5.5
V
Power Analog Microelectronics,Inc
www.poweranalog.com
10/2012 Rev1.0
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PAM8006A
15W Stereo Class-D Audio Power Amplifier with Power Limit
Typical Performance Characteristics
VCC=18V,R L=8Ω, Gv=32dB,Τ Α=25°C, unless otherwise noted.
Audio Precision
11/11/11 14:46:35
1. THD +N vs Power (VCC=12V)
2. THD+N vs Power (VCC=18V)
20
50
10
20
10
5
5
2
%
2
%
1
f=10kHz
f=10kHz
f=1kHz
1
f=1kHz
0.5
0.5
0.2
0.2
f=100Hz
0.1
f=100Hz
0 . 07
0.1
1m 2m
5m 10m 20m
50m 100m
500m 1
W
Audio Precision
2
5
1m
10 20
5m
10 m
20 m
50 m 100 m
500 m
1
2
5
10
30
W
11/11/11 15:00:44
Axis Comment
3. THD+N vs Frequency (VCC=12V)
Sweep Trace Color
2m
4. THD+N vs Frequency (VCC=18V)
Line Style Thick Data
10
10
1
2
53
1
1
1
Red
Solid
Magenta Solid
Blue
Solid
2
2
2
Anlr.THD+N Ratio Left
Anlr.THD+N Ratio Left
Anlr.THD+N Ratio Left
1k
10k
5
THD+N Vs PO 8620.at2c
2
2
1
Po=10W
%
Po=3W
0.5
Po=5W
1
Po=1W
%
0 .5
0 .2
0.2
0 .1
0.1
Po=5W
0.06
20
50
100
200
500
1k
2k
5k
10k
Po=3W
0 . 06
20
20k
50
100
200
500
1k
2k
5k
10 k
20 k
Hz
Hz
Sweep
Trace Color
Line Style Thick Data
Axis
1
2
3
1
1
1
Solid
Solid
Solid
Left
Left
Left
5. Frequency Response
+ 40
+ 38
+ 36
Red
Magenta
Blue
Cin=2.2uF
2
2
2
Anlr.THD+N Ratio
Anlr.THD+N Ratio
Anlr.THD+N Ratio
Comment
6. Crosstalk
+0
-20
THD plus N vs Freqency8620.at2c
+ 34
-30
+ 32
-40
+ 30
+ 28
d
B
g
Cin=1uF
+ 26
-50
d
B
Cin=0.47uF
+ 24
A
T
-10
L to R
-60
-70
+ 22
-80
+ 20
+ 18
-90
Cin=0.1uF
+ 16
-100
R to L
+ 14
-110
+ 12
+ 10
20
50
100
200
500
1k
2k
5k
10 k
-120
20
20 k
50
100
200
500
1k
2k
5k
10 k
20k
Hz
Hz
Power Analog Microelectronics,Inc
www.poweranalog.com
10/2012 Rev1.0
8
PAM8006A
15W Stereo Class-D Audio Power Amplifier with Power Limit
Typical Performance Characteristics
VCC=18V,R L=8Ω, Gv=32dB,Τ Α=25°C, unless otherwise noted.
Audio Precision
10/21/11 16:19:03
7. PSRR
+0
8. Noise Floor
+0
T T
- 10
-10
- 20
-20
- 30
- 40
-30
d
B
VCC=12V
-40
d
B
r
- 50
A
- 70
- 60
-50
- 80
-60
- 90
- 100
-70
VCC=18V
-80
10
- 110
- 120
20
50
100 200
500
1k
2k
5k
10k
20k
100k
20
50
100
200
500
Sweep Trace Color Line Style Thick Data
Axis Comment
9. Efficiency vs Output Power
(VCC=12V)
100 1
90
1
1
3
Red
Blue
Solid
Solid
2
2
2k
5k
10 k
20 k
10. Efficiency vs Output Power (VCC=18V)
100
Anlr.Crosstalk Left
Anlr.Crosstalk Left
90
PSRR-8620.at2
80
80
Efficiency(%)
70
Efficiency(%)
1k
Hz
Hz
60
50
40
70
60
50
40
30
30
20
20
10
10
0
0
0
2
4
6
8
10
12
0
3
Output Power(W)
6
9
12
15
Output Power(W)
11. PL Voltage vs Output Power
12. Quiescent Current vs Supply Voltage
20
25
19.5
19
Quiescent Current(mA)
Output power(W)
20
15
10
5
18.5
18
17.5
17
16.5
16
15.5
0
15
0.4
0.6
0.8
1
1.2
PL Volatage(V)
1.4
1.6
6
11
16
21
Supply Voltage(V)
26
31
Power Analog Microelectronics,Inc
www.poweranalog.com
10/2012 Rev1.0
9
PAM8006A
15W Stereo Class-D Audio Power Amplifier with Power Limit
Test Setup for Performance Testing
PAM8006A Demo Board
Load
+OUT
AP System One
Generator
Input
AP
Low Pass
Filter
GND
-OUT
AP System Two
Analyzer
AUX-0025
VCC
Power Supply
Notes
1. The 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 efficiency
measurement.
Power Analog Microelectronics,Inc
www.poweranalog.com
10/2012 Rev1.0
10
PAM8006A
15W Stereo Class-D Audio Power Amplifier with Power Limit
Application Information
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
a m p l i f i e r a n d t h e s p e a k e r. T h e o p t i m u m
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-series-resistance (ESR)
c e r a m i c c a p a c i t o r , t y p i c a l l y 1 µ F, i s
recommended, placing as close as possible to the
device’s VCC lead. To filter lower-frequency
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.
MUTE Operation
The MUTE pin is an input for controlling the output
state of the PAM8006A. 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 without a volume fade.
Shutdown Operation
The PAM8006A 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
transistors 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 must be
connected from xOUTP to xBSP, and another
220nF capacitor from xOUTN to xBSN. It is
recommended to use 1μF BST capacitor to
replace 220nF or 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
external input capacitors and this internal
reference allow the inputs to be biased within the
optimal common-mode range of the input
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, a internal regulators are used to clamp
the gate voltage. A 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.
Internal Regulated 5-V Supply (AVDD)
The AVDD terminal is the output of an internallygenerated 5V supply, used for the oscillator,
amplifier,power limit circuitry and logic control
circuitry. 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.
Power Supply Decoupling, C S
The PAM8006A is a high-performance CMOS
audio amplifier that requires adequate power
Power Analog Microelectronics,Inc
www.poweranalog.com
10/2012 Rev1.0
11
PAM8006A
15W Stereo Class-D Audio Power Amplifier with Power Limit
Differential Input
PLIMIT
The differential input stage of the amplifier
eliminates noises that appear on the two input
lines of the channel. To use the PAM8006A 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 PAM8006A with a single-ended source,
ac-ground 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 singleended input application, the INP input should be
ac-grounded at the audio source other than at the
device input for best noise performance.
The voltage at PL pin can used to limit the power
to levels below that which is possible based on
the supply rail. Add a resistor from PL to ground to
set the voltage at the PLIMIT pin. An external
reference may also be used if tighter tolerance is
required. Also add a 1uF capacitor fromPL pin to
ground. The PLIMIT circuit sets a limit on the
output peak-to-peak voltage. The gain of class D
amplifier will automatic reduced if the output
power higher than setting value to make output
power less than limited value and also provide
good sound quality.
The output power
below.
Using low-ESR Capacitors
vs PL pin resistor value as
VCC=12V,Rload=8 Ω
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 PAM8006A has short circuit protection
circuitry on the outputs to prevent damage to the
device when output-to-output shorts, output-toGND shorts, or output-to-VCCshorts 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.
R(Ω)
PL (V)
PL(W)
R(Ω)
PL (V)
PL(W)
56K
62K
0.61
0.67
3.1
3.7
100K
110K
0.99
1.07
8.1
9.0
68K
0.73
4.3
120K
1.15
9.6
75K
0.79
5.1
130K
1.22
10.0
82K
91K
0.85
0.92
6.0
7.0
140K
1.36
10.7
Soft Clip
PAM Plimit
Hard Clip
Thermal Protection
Thermal protection on the PAM8006A prevents
damage to the device when the internal die
temperature exceeds 160°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 50°C. The
device begins normal operation at this point
without external system intervention.
Power Analog Microelectronics,Inc
www.poweranalog.com
10/2012 Rev1.0
12
PAM8006A
15W Stereo Class-D Audio Power Amplifier with Power Limit
Power Up/Down Sequence
The PAM8006A 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. Suggest
PL starting voltage is greater than 5V.
Start-up /power down sequencer recommended
Power Analog Microelectronics,Inc
www.poweranalog.com
10/2012 Rev1.0
13
PAM8006A
15W Stereo Class-D Audio Power Amplifier with Power Limit
Ordering Information
PAM8006A X X
Shipping
Package Type
Please consult PAM sales office or authorized distributors for more details.
Part Number
PAM8006ATR
Marking
PAM8006A
XXXYWWLL
Package Type
Standard Package
QFN 5x5-32L
3,000 units/Tape & Reel
Power Analog Microelectronics,Inc
www.poweranalog.com
10/2012 Rev1.0
14
PAM8006A
15W Stereo Class-D Audio Power Amplifier with Power Limit
Outline Dimension
QFN5x5-32L
Power Analog Microelectronics,Inc
www.poweranalog.com
10/2012 Rev1.0
15