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PAM8610
10W Stereo Class-D Audio Power Amplifier with DC Volume Control
Key Features
n 10W@10%THD / Channel Output into a 8 Load at 13V n Low Noise: -90dB n Over 90% Efficiency n 32Step DC Volume Control from -75dB to 32dB n With Shutdown/Mute/Fade Function n Over Current , Thermal and Short-Circuit Protection n Low THD+N n Low Quiescent Current n Pop noise suppression n Small Package Outlines: Thin 40-pin QFN 6mm*6mm Package n Pb-Free Package (RoHS Compliant)
General Description
The PAM8610 is a 10W (per channel) stereo class-D audio amplifier with DC Volume Control which offers low THD+N (0.1%), low EMI, and good PSRR thus high-quality sound reproduction. The 32 steps DC volume control has a +32dB to -75dB range. The PAM8610 runs off of a 7V to 15V supply at much higher efficiency than competitors' Ics. The PAM8610 only requires very few external components, significantly saving cost and board space. The PAM8610 is available in a 40pin QFN 6mm*6mm 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
PVCCR PVCCR
1F 1F 1F
GND
1F 10 F
10 F
ROUTN
PGNDR
ROUTN
PVCCR
PGNDR
ROUTP
ROUTP
BSRN
BSRP
PVCCR
GND
1F
VCLAMPR
RINN RINP
GND
1F
RINN
GND
SHUTDOWN
1F 1F
RINP
SD AGND
AVDD VREF
1F
V2P5
GND GND
VOLUME
VOLUME REFGND
PAM8610
AVCC
10 F
VCC 100nF MUTE GND
MUTE AGND
GND
AGND1
120K
FADE LINP LINN
1F 1F
FADE LINP LINN
ROSC COSC
220pF
VCLAMPL
GND GND
1F
PGNDL LOUTN PVCCL LOUTN PVCCL
1F
1F
10 F
1F
1F
LOUTP
10 F
PVCCL
PVCCL
GND
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GND
PGNDL
LOUTP
BSLN
BSLP
PAM8610
10W Stereo Class-D Audio Power Amplifier with DC Volume Control
Block Diagram
BSRN PVCCR ROUTN PGNDR BSRP PVCCR Driver ROUTP
Driver _ + _ +
RINN RINP
+ +-
-
PAM Modulation
VOLUME FADE
Gain Adjust
PGNDR
Feedback System
AVCC
ROSC COSC AVDD
AGND
osc
on/off Depop LDO
Biases & References BSLN PVCCL Driver LOUTN PGNDL BSLP PVCCL Driver LOUTP PGNDL
Feedback System
Thermal
Short Circuit Protection
SD
V2P5 MUTE
LINN LINP
+ +-
-
_ + _ +
PAM Modulation
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PAM8610
10W Stereo Class-D Audio Power Amplifier with DC Volume Control
Pin Configuration & Marking Information
Top View 6mm*6mm QFN
PGNDR ROUTN ROUTN PVCCR PGNDR ROUTP ROUTP PVCCR BSRN BSRP
40
RINN RINP AVDD VREF VOLUME REFGND AGND1 FADE LINP LINN
39
38
37
36
35
34
33
32
31 30 29 28 27
VCLAMPR SD AGND V2P5 AVCC MUTE AGND ROSC COSC VCLAMPL
1 2 3 4 5 6 7 8 9 10
PAM8610 XATYWWLL
26 25 24 23 22 21
X: Internal Code A: Assembly Code T: Testing Code Y: Year WW: Week LL: Internal Code
11
12
13
LOUTN
14
LOUTN
15
BSLN
16
BSLP
17
LOUTP
18
LOUTP
19
PVCCL
20
PGNDL
PGNDL
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PVCCL
PAM8610
10W Stereo Class-D Audio Power Amplifier with DC Volume Control
Pin Descriptions
Pin Number 1 2 3 4 5 6 7 8 9 10 11,20 12,19 13,14 15 16 17,18 21 22 23 24,28 25 26 27 29 30 31,40 32,39 33,34 35 36 37,38 Name RINN RINP AVDD VREF VOLUME REFGND AGND1 Function Negative differential audio input for right channel Positive differential audio input for right channel 5V Analog VDD Analog reference for gain control section DC voltage that sets the gain of the amplifier Ground for gain control circuitry. Connect to AGND. If using a DAC to control the volume, connect the DAC ground to this terminal. Analog GND Input for controlling volume ramp rate when cycling SD or during power-up. A logic low on this pin places the amplifier in fade mode. A logic high on this pin allows a quick transition to the desired volume setting. LINP LINN PGNDL PVCCL LOUTN BSLN BSLP LOUTP Positive differential audio input for left channel Negative differential audio input for left channel Power ground for left channel H-bridge Power supply for left channel H-bridge, not connected to PVCCR or AVCC. Class-D 1/2-H-bridge negative output for left channel Bootstrap I/O for left channel, negative high-side FET Bootstrap I/O for left channel, positive high-side FET Class-D 1/2-H-bridge positive output for left channel I/O for charge/discharging currents onto capacitor for ramp generator triangle wave biased at V2P5 Current setting resistor for ramp generator. Nominally equal to 1/8*VCC Analog GND A logic high on this pin disables the outputs and a logic low enables the outputs. High-voltage analog power supply (7V to 15V) 2.5V Reference for analog cells, as well as reference for unused audio input when using single-ended inputs. 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. Class-D 1/2-H-bridge positive output for right channel Bootstrap I/O for right channel, positive high-side FET Bootstrap I/O for right channel, negative high-side FET Class-D 1/2-H-bridge negative output for right channel
FADE
VCLAMPL Internally generated voltage supply for left channel bootstrap capacitors. COSC ROSC AGND MUTE AVCC V2P5 SD
VCLAMPR Internally generated voltage supply for right channel bootstrap capacitors. PGNDR PVCCR ROUTP BSRP BSRN ROUTN
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PAM8610
10W Stereo Class-D Audio Power Amplifier with DC Volume Control
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 DD .........................-0.3V to16.5V Input Voltage Range V I: MUTE,VREF,VOLUME, FADE ................0V to 6.0V SD ....................................................-0.3V to V DD RINN,RINP,LINN,LINP......................-0.3V to 6.0V Junction Temperature Range,T J......-40C to 125 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 (V DD)............................7V to 15V Maximum Volume Control Pins, Input Pins Voltage................................................0V to 5.0V High Level Input Voltage: SD .................2.0V to V DD MUTE , FADE ...2.0V to 5V Low Level Input Voltage: SD ...................0 to 0.3V MUTE , FADE .....0 to 0.3V Ambient Operating Temperature......-20 C to 85 C
Thermal Information
Parameter Thermal Resistance (Junction to Case) Thermal Resistance (Junction to Ambient) Package QFN 6mm*6mm QFN 6mm*6mm Symbol JC JA Maximum 7.6 C/W 18.1 Unit
The Exposed PAD must be soldered to a thermal land on the PCB.
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PAM8610
10W Stereo Class-D Audio Power Amplifier with DC Volume Control
Electrical Characteristic
Parameter Supply Voltage
T A=25 C , V DD=12V,R L=8 (unless otherwise noted)
Symbol V DD THD+N=0.1%,f=1kHz,RL=8 THD+N=1.0%,f=1kHz,RL=8 Continuous Output Power Po THD+N=10%,f=1kHz,RL=8, V DD= 13 V THD+N=10%,f=1kHz,R L=4( N ot e ) Total Harmonic Distortion plus Noise Quiescent Current Supply Quiescent Current in shutdown mode Drain-source on-state resistance Power Supply Ripple Rejection Ratio Oscillator Frequency Output Integrated Noise Floor Crosstalk Signal to Noise Ratio Output offset voltage (measured differentially) 2.5V Bias voltage Internal Analog supply Voltage Over Temperature Shutdown Thermal Hysteresis THD+N IDD ISD P O=5W, f=1kHz, RL =8 (no load) SHUTDOWN=0V V CC=12V rds(on) IO=1A TJ=25 PSRR fOSC Vn CS SNR |V OS| V2P5 AV DD OTS OTH High side Low side Total condition MIN 7.0 TYP 12 5 8 10 15 0.1 20 4 200 200 400 -60 250 -90 -80 80 30 2.5 5 150 40 5.5 dB kHz dB dB dB mV V V C C m 30 10 % mA A W MAX 15 Units V
1VPP ripple, f=1kHz, Inputs ac-coupled to ground ROSC=120k, C O S C = 22 0 pF 20Hz to 22 kHz, A-weighting P O=3W, R L=8, f=1kHz Maximum output at THD+N< 0.5%, f=1kHz INN and INP connected together No Load V DD=7V to 15V
Note: Heat sink is required for high power output.
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PAM8610
10W Stereo Class-D Audio Power Amplifier with DC Volume Control Table 1. DC Volume Control
Step 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Volume 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0 3.1 Gain (dB) -75 -40 -30 -20 -10 -5 0 5 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 Rf (k) 0.40 1.26 3.92 11.90 20.22 33.33 52.47 77.49 83.02 88.65 94.37 100.12 105.87 111.58 117.21 122.74 128.12 133.33 138.35 143.15 147.71 152.04 156.11 159.92 163.49 166.80 169.86 172.69 175.30 177.68 179.87 200.00 Ri (k) 200.00 199.60 198.74 196.08 188.10 179.78 166.67 147.53 122.51 116.98 111.35 105.63 99.88 94.13 88.42 82.79 77.26 71.88 66.67 61.65 56.85 52.29 47.96 43.89 40.08 36.51 33.20 30.14 27.31 24.70 22.32 20.13
Note: Volume: DC voltage on Volume pin Rf: Internal pre-amplifier feedback resistance Ri: Internal pre-amplifier input resistance Calculation Gain=20log (5XRf/Ri), there is one dB tolerance from device to device.
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PAM8610
10W Stereo Class-D Audio Power Amplifier with DC Volume Control
Typical Performance Characteristics
V DD=12V,R L=8 , Gv=24dB, =25 C, unless otherwise noted. 1. THD +N vs. Power
100 50 20 10 5 2 % 1 0.5 0.2 0.1 0.05 0.02 0.01 10m 20m 50m 100m 200m 500m W 1 2 5 10
4. THD+N vs Frequency
10
V DD=15V V DD=12V V DD=7V
%
5 2 1 0.5 0.2 0.1 0.04 20
Po=3W Po=1W
Po=5W
50 100 200 500 H z 1k 2k 5k 10k 20k
2. THD +N vs. Power
100 50 20 10 5 2 % 1 0.5 0.2 0.1 0.05 0.02 0.01 10m 20m 50m 100m 200m 500m W 1 2 5 10
5. THD+N vs Frequency (Po=1W)
10 5
f=10kHz f=500Hz
%
2 1 0.5
V DD=7V
V DD=12V
f=100Hz
0.2 0.1 0.06 20 50
V DD=15V
100 200 50 0 H z 1 k 2k 5k 10k 20 k
3. THD +N vs. Power
100 50
6. THD+N vs Frequency (Po=3W)
10 5
20 10 5 2 % 1 0.5 0.2 0.1 0.05 0.02 0.01 10m 20m 50m 100m 200m 500m W 1
2 1
Gv=32dB
%
0.5 0.2
Gv=18dB
Gv=32dB
Gv=12dB Gv=18dB
2 5 10
0.1 0.05 0.03 20 50
Gv=12dB
100 200 500 Hz 1k 2k 5k 10k 20k
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PAM8610
10W Stereo Class-D Audio Power Amplifier with DC Volume Control
Typical Performance Characteristics
V DD=12V,R L=4 , Gv=24dB, =25 C, unless otherwise noted.
7. THD +N vs. Power
100 50 20 10 5 2 % 1 0.5 0.2 0.1 0.05
0.1 0.2 10
10. THD+N vs Frequency
V DD=15V V DD=12V V DD=7V
% 0.5 5
2
Po=1W
1
Po=3W
0.02 0.01 10m 20m 50m 100m 200m 500m W 1 2 5 10 20 30
0.05 20 50 100 200 500 Hz
Po=5W
1k 2k 5k 10k 20k
8. THD +N vs. Power
100 50
5 10
11. THD+N vs Frequency (Po=1W)
20 10 5 2 % 1 0.5 0.2 0.1 0.05 0.02 0.01 10m 20m 50m 100m 200m 500m W 1 2 5 10 20
0.05 20 50 100 0.2
f=10kHz f=500Hz
%
2
1
V DD=7V V DD=15V
0.5
f=100Hz
0.1
V DD=12V
200 500 Hz 1k 2k 5k 10k 20k
9. THD +N vs. Power
100 50
5 10
12. THD+N vs Frequency (Po=3W)
20 10 5
1 2
2 % 1 0. 5
0.2
Gv=32dB
%
0.5
Gv=18dB
Gv=32dB
0. 2 0. 1 0.05 0.02 0.01 10m 20m 50m 100m 200m 500m W 1 2 5 10 20
0.02 20 50 100 200 500 Hz 1k 2k 5k 10k 20k 0.1
Gv=12dB
Gv=18dB
0.05
Gv=12dB
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PAM8610
10W Stereo Class-D Audio Power Amplifier with DC Volume Control
Typical Performance Characteristics
V DD=12V,R L=8 , Gv=24dB, =25 C, unless otherwise noted. 13. Power Supply Ripple Rejection
+0 -10 -20 -30 -40 d B -50 -60 -70 -80 -90 -100 10 20 50 100 200 500 1k Hz 2k 5k 10k 20k 50k 100k
d B V +0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 -150 20 50 100 200 500 Hz 1k 2k 5k 10k 20k
16. Noise Floor
14. Crosstalk
-50 T -55 -60
-20 +0 -10
17. CMRR
-65 -70 d B -75 -80 -85
-60 -30
L to R
d B r A
-40
-50
-90 -95 -100 20
R to L
50 100 200 500 Hz 1k 2k 5k 10k 20k
-70
-80 20
50
100
200
500 Hz
1k
2k
5k
10k
20k
15. Frequency Response (Vo=1.0Vrms)
+5 +4 +3 +2 +1 +0 -1 -2 -3 -4 -5 20
18. Efficiency vs Power
100 90 80 70
d B r A
Efficiency(%)
50 100 200 500 Hz 1k 2k 5k 10k 20k 30k
60 50 40 30 20 10 0 0 1 2 3 4 5 6 7 8 9 10 Output Power(W)
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08/2008 Rev 1.2
PAM8610
10W Stereo Class-D Audio Power Amplifier with DC Volume Control
Typical Performance Characteristics
V DD=12V,R L=8 , Gv=24dB, =25 C, unless otherwise noted. 19. Output Power vs Supply Voltage
18 16 14
Output Power (W)
21.Gain vs DC voltage
12 10 8 6 4 2 0 7 8 9 10
THD+N=10%
Gain (dB)
THD+N=1%
11
12
13
14
15
0
0.4
0.8
1.2
1.6
2
2.4
2.8
Supply Voltage (V)
Volume Voltage (V)
20. Quesicent Current vs Supply Voltage
25
22.Power Dissipation vs. Output Power
4 3.5
Quiescent Current (mA)
Power Dissipation(W)
7 8 9 10 11 12 Supply Voltage (V) 13 14 15
20
3 2.5 2 1.5 1 0.5
15
10
5
0
0 0 3 6 Output Power (W) Two channels driven 9 12
Note: PCB information for power dissipation measurement. 1. The PCB size is 74mm * 68mm with 1.2mm thickness, two layers and Fr4. 2. 16 vias at the thermal land on the PCB with 0.5mm diameter. 3. The size of exposed copper is 10mm*10mm with 3oz thickness.
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PAM8610
10W Stereo Class-D Audio Power Amplifier with DC Volume Control
Test Setup for Performance Testing
PAM8610 Demo Board Load +OUT AP System One Generator Input AP Low Pass Filter GND -OUT VDD AUX-0025 AP System One Analyzer
Power Supply
Notes
1. The AP AUX-0025 low pass filter is necessary for class-D amplifier measurement with AP analyzer. 2. Two 22H inductors are used in series with load resistor to emulate the small speaker for efficiency measurement.
Application Information
Power and Heat Dissipation Choose speakers that are able to stand large output power from the PAM8610. 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. In operation, some of power is dissipated to the resistors. Power Dissipation: P loss=(Po*(1- )/)* 2 The PAM8610's efficiency is 90% with 10W ouput and 8 load. The dissipation power is 2.22W. Thermal resistance of junction to ambient of the QFN package is 18.1C/W and the junction temperature Tj=P loss* jA+Ta, where Ta is ambient temperature. If the ambient temperature is 85C, the QFN's junction temperature Tj=2.22*18.1+85=125C w h i c h i s l o w e r t h a n 1 5 0 C ra t e d j u n c t i o n temperature. If the rated workable junction temperature is 150C, the relationship between ambient temperature and permitted P loss is shown in below diagram.
10 9 8 7
Ploss(W)
6 5 4 3 2 1 0 0 20 40 Ta 60 80 100
From the diagram, it can be found that when the device works at 10W/8 load the dissipation power is 1.1W per channel, 2.2W total, the permitted ambient temperature is over 100C. This is proven by actual test. The PAM8610 can work in full output power under 85C ambient temperature.
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PAM8610
10W Stereo Class-D Audio Power Amplifier with DC Volume Control
Heat Dissipation in PCB design 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. 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. 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. Consideration for EMI 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).
Ferrite Bead
OUTP
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
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PAM8610
10W Stereo Class-D Audio Power Amplifier with DC Volume Control
Volume Control A DC volume control section is integrated in PAM8610, controlling via VREF, VOLUME and VREFGND terminals. The voltage on VOLUME pin, without exceeding VREF, determines internal amplifier gain as listed in Table 1. If a resistor divider is used to fix gain of the amplifier, the VREF terminal can be directly connected to AVDD and the resistor divider connected across VREF and REFGND. For fixed gain, the resistor divider values are calculated to center the voltage given in the Table 1. FADE Operation The FADE terminal is a logic input that controls the operation of the volume control circuitry during transitions to and from the shutdown state and during power-up. A logic low on this terminal will set the amplifier in fade mode. During power-up or recovery from the shutdown state (a logic high is applied to the SD terminal), the volume is smoothly ramped up from the mute state, -75dB, to the desired volume set by the voltage on the volume control terminal. Conversely, the volume is smoothly ramped down from the current state to the mute state when a logic low is applied to the SD terminal. A logic high on this pin disables the volume fade effect during transitions to and from the shutdown state and during power-up. During power-up or recovery from the shutdown state (a logic high is applied to the SD terminal), the transition from the mute state, -75dB, to the desired volume setting is less than 1ms. Conversely, the volume ramps down from current state to the mute state within 1ms when a logic low is applied to the SD terminal. MUTE Operation The MUTE pin is an input for controlling the output state of the PAM8610. 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. For power saving, the SD pin should be used to reduce the quiescent current to the absolute minimum level. The volume will fade, increasing or decreasing slowly, when leaving or entering the shutdown state if the FADE terminal is held low. If the FADE terminal is held high, the outputs will transit very quickly. Refer to the FADE operation section. 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 0.47F 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. Power Supply Decoupling, C S The PAM8610 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 Shutdown Operation The PAM8610 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. For the best power-off pop performance, the amplifier should be set in shutdown mode prior to removing the power supply voltage.
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PAM8610
10W Stereo Class-D Audio Power Amplifier with DC Volume Control
hash on the line, a good low equivalent-seriesresistance (ESR) ceramic capacitor, typically 1F, is recommended, placing as close as possible to the device's VCC lead. To filter lower-frequency noises, a large aluminum electrolytic capacitor of 10F or greater is recommended, placing near the audio power amplifier. The 10F capacitor also serves as a local storage capacitor for supplying current during large signal transients on the amplifier outputs. Selection of C OSC and R OSC The switching frequency is determined by the values of components connected to ROSC (pin 23) and COSC (pin 22) and calculated as follows: f OSC = 2 / (R OSC * C OSC) The frequency may varies from 225kHz to 275kHz by adjusting the values of R OSC and C OSC. The r e c o m m e n d e d v a l u e s a r e C O S C = 2 2 0 p F, R OSC=120k for a switching frequency of 250kHz. BSN and BSP Capacitors 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 r ecommended to use 1 F BST capacitor to replace 220nF (pin15, pin16, pin35 and pin36) for lower than 100Hz applications. 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 1F capacitors must be connected from VCLAMPL and VCLAMPR 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, preamplifier, and volume control circuitry. It requires a 0.1F to 1F 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. Differential Input The differential input stage of the amplifier eliminates noises that appear on the two input lines of the channel. To use the PAM8610 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 PAM8610 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. 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 PAM8610 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-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. Thermal Protection Thermal protection on the PAM8610 prevents damage to the device when the internal die temperature exceeds 150C. 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 40C. The device begins normal operation at this point without external system intervention.
Power Analog Microelectronics , Inc www.poweranalog.com 15
08/2008 Rev 1.2
PAM8610
10W Stereo Class-D Audio Power Amplifier with DC Volume Control
Ordering Information
PAM8610 X X
Shipping Package Type
Part Number PAM8610TR Marking PAM8610 XATYWWLL Package Type QFN 6mm*6mm Standard Package 3,000 units/Tape & Reel
Please consult PAM sales office or authorized distributors for more details.
Power Analog Microelectronics , Inc www.poweranalog.com 16
08/2008 Rev 1.2
PAM8610
10W Stereo Class-D Audio Power Amplifier with DC Volume Control
Outline Dimension
40pin QFN
QFN
Unit: Millimeter
Power Analog Microelectronics , Inc www.poweranalog.com 17
08/2008 Rev 1.2

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