PAM8606

PAM8606 6W Stereo Class-D Audio Power Amplifier with DC Volume Control Key Features n 6W@10%THD / Channel Output into a 8 Ω Load at 10V n Low Noise: –80dB 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: 48pinTQFP(E-PAD) 7mm*7mm Package n Pb-Free Package (RoHS Compliant) General Description The PAM8606 is 6W (per channel), stereo classD audio amplifier with DC Volume Control which offers low THD+N (0.1%), low EMI, and good PSRR, allowing it to produce high-quality sound reproduction. The 32 steps DC volume control has a +32dB to -75dB range. The PAM8606 runs off of a 7.0V to 13.5V supply a t m u c h h i g h e r e ff i c i e n c y t h a n c l a s s - A B amplifier. The PAM8606 only requires minimal number of external components, resulting in significant cost and board space savings. The PAM8606 is available in a 48pin TQFP(EPAD) 7mm*7mm 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 1μF 1μF 1μF GND 1μF 10 μ F 10 μ F ROUTN PGNDR ROUTN PVCCR PVCCR PGNDR ROUTP ROUTP BSRN BSRP PVCCR PVCCR GND GND PGNDR PGNDR GND 1μF GND SHUTDOWN RINN RINP GND 1μF RINN VCLAMPR 1μF 1μF RINP SD AGND AVDD VREF 1μF V2P5 GND GND VOLUME VOLUME REFGND PAM8606 AVCC 10 μ F VCC 100nF MUTE GND MUTE AGND GND AGND1 120K FADE LINP LINN GND 1μF FADE LINP LINN ROSC COSC 220pF VCLAMPL GND GND GND 1μF 1μF PGNDL PGNDL PGNDL LOUTN PVCCL PVCCL LOUTN PVCCL PVCCL 1μF 1μF 10 μ F 1μF 1μF LOUTP 10 μ F PVCCL PVCCL GND Power Analog Microelectronics , Inc www.poweranalog.com 1 08/2008 Rev 1.1 GND PGNDL LOUTP BSLN BSLP PAM8606 6W Stereo Class-D Audio Power Amplifier with DC Volume Control Block Diagram BSRN PVCCR Driver _ + _ + Driver ROUTN PGNDR BSRP PVCCR ROUTP PGNDR RINN RINP + +- - PAM Modulation VOLUME FADE Gain Adjust Feedback System AVCC ROSC COSC AVDD SD V2P5 MUTE Driver AGND osc on/off Depop LDO Biases & References Thermal Short Circuit Protection BSLN P VCCL LOUTN PGNDL BSLP PVCCL Driver LINN LINP + +- - _ + _ + PAM Modulation LOUTP PGNDL Feedback System Power Analog Microelectronics , Inc www.poweranalog.com 2 08/2008 Rev 1.1 PAM8606 6W Stereo Class-D Audio Power Amplifier with DC Volume Control P in Configuration & Marking Information Top View 7mm*7mm TQFP PGNDR PVCCR ROUTN ROUTN ROUTP ROUTP PVCCR BSRN BSRP PGNDR PVCCR PVCCR 48 PGNDR RINN RINP AVDD VREF VOLUME REFGND AGND1 FADE LINP LINN PGNDL 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 PGNDR VCLAMPR SD AGND V2P5 AVCC MUTE AGND ROSC COSC VCLAMPL PGNDL 1 2 3 4 5 6 7 8 9 10 11 12 13 PGNDL PAM8606 XATYWWLL 31 30 29 28 27 26 25 X: Internal Code A: Assembly Code T: Testing Code Y: Year WW: Week LL: Internal Code 14 PVCCL 15 PVCCL 16 LOUTN 17 LOUTN 18 BSLN 19 BSLP 20 LOUTP 21 LOUTP 22 PVCCL 23 PVCCL 24 PGNDL Power Analog Microelectronics , Inc www.poweranalog.com 3 08/2008 Rev 1.1 PAM8606 6W Stereo Class-D Audio Power Amplifier with DC Volume Control P in Descriptions Number Name RINN RINP AVDD VREF VOLUME REFGND AGND1 FADE LINP LINN PGNDL PVCCL LOUTN BSLN BSLP LOUTP VCLAMPL COSC ROSC AGND MUTE AVCC V2P5 SD VCLAMPR PGNDR PVCCR ROUTP BSRP BSRN ROUTN 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 9 10 11 12,13,24,25 14,15,22,23 16,17 18 19 20,21 26 27 28 29,33 30 31 32 34 35 1,36,37,48 38,39,46,47 40,41 42 43 44,45 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. 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 Internally generated voltage supply for left channel bootstrap capacitors. I/O for charge/discharging currents onto capacitor for ramp generator triangle wave biased at V2P5 Current setting resistor for ramp generator. Analog GND A logic high on this pin disables the outputs and a logic low enables the outputs. High-voltage analog power supply (7.0 V to 13.5V) 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 AVCC. Internally generated voltage supply for right channel bootstrap capacitors. 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 2 3 4 5 6 7 8 Power Analog Microelectronics , Inc www.poweranalog.com 4 08/2008 Rev 1.1 PAM8606 6W Stereo Class-D Audio Power Amplifier with DC Volume Control A bsolute 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 to15.0V 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......-40°C 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................................7.0V to 13.5V Maximum Volume Control Pins, Input Pins Voltage................................................0V to 5.0V High Level Input Voltage: SD .........................2.0V MUTE , FADE ...........2.0V Low Level Input Voltage: SD .........................0.3V MUTE , FADE ...........0.3V Ambient Operating Temperature......-20 °C to 85 °C Thermal Information Parameter Thermal Resistance (Junction to Case) Thermal Resistance* (Junction to Ambient) Package TQFP 7mm*7mm Symbol θJC Maximum 8.7 °C/W TQFP 7mm*7mm θJA 48 Unit *4-layer PCB with the Exposed PAD soldered to a thermal land on the PCB and vias on PCB for heat dissipation (refer to Application Information hereinafter). Power Analog Microelectronics , Inc www.poweranalog.com 5 08/2008 Rev 1.1 PAM8606 6W Stereo Class-D Audio Power Amplifier with DC Volume Control Electrical Characteristic Parameter Supply Voltage T A=25 °C , V DD =9V, R L=8 Ω (unless otherwise noted) Symbol condition VDD THD+N=0.1%,f=1kHz,RL=8Ω Continuous Output Power Po THD+N=1.0%,f=1kHz,RL=8Ω THD+N=10%,f=1kHz,RL=8Ω , VD D=1 0 V 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 PO=4W, f=1kHz, RL =8Ω (no load) SHUTDOWN=0V VCC=12V rds(on) IO=1A TJ =25℃ PSRR fOSC Vn CS SNR |VOS| V2P5 AVDD OTS OTH to ground ROSC =120kΩ , C O S C = 22 0 pF 20Hz to 22 kHz, A-weighted PO=3W, RL=8Ω , f=1kHz Maximum output at THD+N < 0.5%, f=1 kHz INN and INP connected together No Load VDD=7V to 13.5V High side Low side Total MIN 7.0 TYP 9 4 4.5 6 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 mΩ 30 10 % mA μA W MAX 13.5 Units V 1VPP ripple, f=1kHz, Inputs ac-coupled Power Analog Microelectronics , Inc www.poweranalog.com 6 08/2008 Rev 1.1 PAM8606 6W 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 (kΩ) 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 (kΩ) 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. Power Analog Microelectronics , Inc www.poweranalog.com 7 08/2008 Rev 1.1 PAM8606 6W Stereo Class-D Audio Power Amplifier with DC Volume Control Typical Performance Characteristics V DD=9V,R L=8 Ω ,T A=25 ° C (unless otherwise noted). 1. THD vs. Power 50 20 10 5 4. THD+N vs Frequency 20 10 V DD=13.5V V DD=9V 5 2 1 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 Po=3W V DD=7V % 0.5 0.2 0.1 0.05 0.02 0.01 20 50 100 200 500 Hz 1k 2k 5k 10k 20k Po=1W 2. THD vs. Power 50 20 10 5 5. THD+N vs Frequency (Po=1W) 20 10 5 2 2 1 % 0.5 0.2 0.1 0.05 0.02 0.01 10m 20m 50m 100m 200m 500m W f=500Hz % 1 0.5 0.2 0.1 V DD=13.5V f=100Hz f=10kHz 1 2 5 10 0.05 0.02 0.01 20 50 100 200 500 V DD=9V V DD=7V 1k 2k 5k 10k 20k Hz 3. THD vs. Power 50 20 10 5 2 1 % 0.5 0.2 0.1 0.05 0.02 0.01 10m 20m 50m 100m 200m 0.1 0.05 20 10 5 2 1 6. THD+N vs Frequency (Po=3W) Gv=32dB % 0.5 0.2 Gv=18dB Gv=32dB Gv=12dB Gv=18dB 500m W 1 2 5 10 0.02 0.01 20 50 Gv=12dB 100 200 500 Hz 1k 2k 5k 10k 20k Power Analog Microelectronics , Inc www.poweranalog.com 8 08/2008 Rev 1.1 PAM8606 6W Stereo Class-D Audio Power Amplifier with DC Volume Control Typical Performance Characteristics V DD=9V,R L=8 Ω ,T A=25 ° C (unless otherwise noted). 7. 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 10. Noise Floor 8. Crosstalk -50 T -55 -60 -20 +0 -10 11. 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 9. Frequency Response (Vo=1.0Vrms) +5 +4 +3 +2 12. Efficiency vs Power 100 90 80 70 Efficiency(%) 50 100 200 500 Hz 1k 2k 5k 10k 20k 30k d B r A +1 +0 -1 -2 -3 -4 -5 20 60 50 40 30 20 10 0 0 1 2 3 Output Pow er(W ) 4 5 6 Power Analog Microelectronics , Inc www.poweranalog.com 9 08/2008 Rev 1.1 PAM8606 6W Stereo Class-D Audio Power Amplifier with DC Volume Control Typical Performance Characteristics V DD=9V,R L=8 Ω ,T A=25 ° C (unless otherwise noted). 13. Output Power vs Supply Voltage 14 12 15.Gain vs DC voltage THD+N=10% Output Power (W) 10 8 6 4 2 0 7 8 9 10 Supply Voltage (V) 11 12 13 0 0.4 0.8 1.2 1.6 2 2.4 2.8 Volume Voltage (V) Gain (dB) THD+N=1% 14. Quesicent Current vs Supply Voltage 20 19.5 Quiescent Current (mA) 16.Power Dissipation vs. Output Power 4 3.5 Power Dissipation(W) 19 18.5 18 17.5 17 16.5 16 7 8 9 10 11 Supply Voltage (V) 12 13 3 2.5 2 1.5 1 0.5 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. Power Analog Microelectronics , Inc www.poweranalog.com 10 08/2008 Rev 1.1 PAM8606 6W Stereo Class-D Audio Power Amplifier with DC Volume Control Test Setup for Performance Testing PAM8606 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 every 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 11 08/2008 Rev 1.1 PAM8606 6W Stereo Class-D Audio Power Amplifier with DC Volume Control A pplication Information 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 as 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 (