PAM8606 6W Stereo Class-D Audio Power Amplifier with DC Volume Control General Description 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) 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. Applications n n n n n The PAM8606 is available in a 48pin TQFP(EPAD) 7mm*7mm package . Flat Monitor /LCD TVS Multi-media Speaker System DVD Players, Game Machines Boom Box Music Instruments 1μF 1μF PVCCR ROUTP PVCCR BSRP ROUTP BSRN ROUTN ROUTN PVCCR 10 μ F PVCCR PGNDR GND GND PVCCR 1μF 1μF 10 μ F PGNDR GND PVCCR Typical Application 1μF VCLAMPR RINN RINP 1μF GND 1μF GND PGNDR PGNDR 1μF RINN RINP GND SHUTDOWN SD AVDD AGND VREF V2P5 GND 1μF VOLUME PAM8606 VOLUME AVCC REFGND MUTE AGND1 AGND FADE ROSC GND VCC 100nF 10 μ F MUTE GND GND 120K LINP COSC LINN VCLAMPL 220pF 1μF PGNDL PGNDL PVCCL PVCCL GND 10 μ F PVCCL 1μF GND 1μF PVCCL GND GND GND 1μF 1μF 10 μ F LOUTP LOUTP BSLP LOUTN PGNDL BSLN PGNDL GND 1μF LOUTN LINN 1μF PVCCL LINP PVCCL FADE Power Analog Microelectronics , Inc www.poweranalog.com 08/2008 Rev 1.1 1 PAM8606 6W Stereo Class-D Audio Power Amplifier with DC Volume Control Block Diagram BSRN PVCCR Driver _ - RINN RINP PGNDR BSRP PVCCR PAM Modulation + _ + + - + Driver VOLUME FADE ROUTN ROUTP PGNDR Gain Adjust Feedback System AVCC AGND ROSC osc COSC on/off Depop AVDD SD Thermal Short Circuit Protection Biases & References LDO V2P5 BSLN MUTE PVCCL Driver LINN LINP - + + - _ PGNDL BSLP PVCCL PAM Modulation + _ LOUTN + Driver LOUTP PGNDL Feedback System Power Analog Microelectronics , Inc www.poweranalog.com 08/2008 Rev 1.1 2 PAM8606 6W Stereo Class-D Audio Power Amplifier with DC Volume Control Pin Configuration & Marking Information BSRP ROUTP ROUTP PVCCR PVCCR PGNDR 46 BSRN PVCCR 47 ROUTN PVCCR 48 ROUTN PGNDR Top View 7mm*7mm TQFP 45 44 43 42 41 40 39 38 37 PGNDR 1 36 PGNDR RINN 2 35 VCLAMPR RINP 3 34 SD AVDD 4 33 AGND VREF 5 32 V2P5 VOLUME 6 31 AVCC REFGND 7 30 MUTE AGND1 8 29 AGND FADE 9 28 ROSC LINP 10 27 COSC LINN 11 26 VCLAMPL PGNDL 12 25 PGNDL PVCCL PVCCL LOUTN LOUTN BSLN 19 20 21 22 23 24 PGNDL 18 PVCCL 17 PVCCL 16 LOUTP 15 LOUTP 14 BSLP 13 PGNDL PAM8606 XATYWWLL X: Internal Code A: Assembly Code T: Testing Code Y: Year WW: Week LL: Internal Code Power Analog Microelectronics , Inc www.poweranalog.com 08/2008 Rev 1.1 3 PAM8606 6W Stereo Class-D Audio Power Amplifier with DC Volume Control Pin Descriptions Number Name Function 2 RINN Negative differential audio input for right channel 3 RINP Positive differential audio input for right channel 4 AVDD 5V Analog VDD 5 VREF Analog reference for gain control section 6 VOLUME 7 REFGND 8 AGND1 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 FADE 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. 10 LINP Positive differential audio input for left channel 11 LINN Negative differential audio input for left channel 12,13,24,25 PGNDL Power ground for left channel H-bridge 14,15,22,23 PVCCL Power supply for left channel H-bridge, not connected to PVCCR or AVCC. 16,17 LOUTN Class-D 1/2-H-bridge negative output for left channel 18 BSLN Bootstrap I/O for left channel, negative high-side FET 19 BSLP Bootstrap I/O for left channel, positive high-side FET 20,21 LOUTP Class-D 1/2-H-bridge positive output for left channel 26 VCLAMPL 27 COSC 28 ROSC Current setting resistor for ramp generator. 29,33 AGND Analog GND 30 MUTE A logic high on this pin disables the outputs and a logic low enables the outputs. 31 AVCC High-voltage analog power supply (7.0 V to 13.5V) 32 V2P5 34 SD 35 VCLAMPR 1,36,37,48 PGNDR Power ground for right channel H-bridge 38,39,46,47 PVCCR Power supply for right channel H-bridge, not connected to PVCCL or AVCC. 40,41 ROUTP Class-D 1/2-H-bridge positive output for right channel 42 BSRP Bootstrap I/O for right channel, positive high-side FET 43 BSRN Bootstrap I/O for right channel, negative high-side FET 44,45 ROUTN Class-D 1/2-H-bridge negative output for right 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 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 Analog Microelectronics , Inc www.poweranalog.com 08/2008 Rev 1.1 4 PAM8606 6W 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 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) Package Symbol Maximum TQFP 7mm*7mm θJC 8.7 Unit °C/W Thermal Resistance* (Junction to Ambient) TQFP 7mm*7mm θJA 48 *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 08/2008 Rev 1.1 5 PAM8606 6W Stereo Class-D Audio Power Amplifier with DC Volume Control Electrical Characteristic T A=25 °C , V DD =9V, R L=8 Ω (unless otherwise noted) Parameter Supply Voltage Continuous Output Power Symbol condition VDD Po Noise Quiescent Current Supply Quiescent Current in shutdown mode Drain-source on-state resistance Power Supply Ripple Rejection Ratio TYP MAX Units 7.0 9 13.5 V THD+N=0.1%,f=1kHz,RL=8Ω 4 THD+N=1.0%,f=1kHz,RL=8Ω 4.5 THD+N=10%,f=1kHz,RL=8Ω , VD D=1 0 V Total Harmonic Distortion plus MIN W 6 PO=4W, f=1kHz, RL =8Ω 0.1 IDD (no load) 20 30 mA ISD SHUTDOWN=0V 4 10 μA THD+N rds(on) PSRR VCC=12V High side 200 IO=1A Low side 200 TJ =25℃ Total 400 1VPP ripple, f=1kHz, Inputs ac-coupled to ground % mΩ -60 dB Oscillator Frequency fOSC ROSC =120kΩ , C O S C = 22 0 pF 250 kHz Output Integrated Noise Floor Vn 20Hz to 22 kHz, A-weighted -90 dB Crosstalk CS PO=3W, RL=8Ω , f=1kHz -80 dB 80 dB Signal to Noise Ratio Output offset voltage SNR Maximum output at THD+N < 0.5%, f=1 kHz |VOS| INN and INP connected together 30 mV 2.5V Bias voltage V2P5 No Load 2.5 V Internal Analog supply Voltage AVDD VDD=7V to 13.5V Over Temperature Shutdown OTS 150 °C Thermal Hysteresis OTH 40 °C (measured differentially) 5 5.5 V Power Analog Microelectronics , Inc www.poweranalog.com 08/2008 Rev 1.1 6 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 08/2008 Rev 1.1 7 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 4. THD+N vs Frequency 20 50 10 20 V DD=13.5V 10 5 5 2 V DD=9V 2 1 % Po=3W 1 V DD=7V % 0.5 0.5 0.2 0.2 0.1 0.1 0.05 0.05 0.02 0.02 0.01 10m 20m 50m 100m 200m 500m 1 2 5 Po=1W 0.01 20 10 50 100 200 W 500 1k 2k 5k 10k 20k Hz 5. THD+N vs Frequency (Po=1W) 2. THD vs. Power 50 20 20 10 10 5 5 2 f=500Hz 2 % % 0.5 0.5 0.2 0.2 0.1 0.1 0.05 f=100Hz V DD=7V f=10kHz 20m 50m 100m 200m 500m V DD=9V 0.05 0.02 0.01 10m V DD=13.5V 1 1 1 2 0.02 5 0.01 20 10 50 100 200 W 1k 2k 5k 10k 20k 5k 10k 20k Hz 3. THD vs. Power 6. THD+N vs Frequency (Po=3W) 20 50 10 20 5 10 5 2 2 1 Gv=32dB 1 % 500 % 0.5 0.5 Gv=18dB Gv=32dB 0.2 0.2 0.1 0.1 0.05 0.05 Gv=12dB Gv=18dB 0.02 0.01 10m 20m 50m 100m 200m 500m 1 2 5 0.02 0.01 20 10 W Gv=12dB 50 100 200 500 Hz 1k 2k Power Analog Microelectronics , Inc www.poweranalog.com 08/2008 Rev 1.1 8 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 10. Noise Floor +0 +0 -10 -10 -20 -20 -30 -40 -30 -50 -40 d B -60 d B V -50 -70 -80 -60 -90 -70 -100 -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 1k 2k 5k 10k 20k 1k 2k 5k 10k 20k Hz Hz 8. Crosstalk 11. CMRR +0 -50 T -55 -10 -60 -20 -65 -30 -70 d B -75 d B r -80 A L to R -40 -50 -85 -60 -90 -70 R to L -95 -100 20 50 100 200 500 1k 2k 5k 10k -80 20 20k 50 100 200 Hz Hz 12. Efficiency vs Power 9. Frequency Response (Vo=1.0Vrms) A +5 100 +4 90 +3 80 +2 70 Efficiency(%) d B r +1 +0 -1 60 50 40 -2 30 -3 20 -4 10 -5 20 50 100 200 500 500 1k 2k 5k 10k 0 20k 30k 0 Hz 1 2 3 4 5 6 Output Pow er(W ) Power Analog Microelectronics , Inc www.poweranalog.com 08/2008 Rev 1.1 9 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 15.Gain vs DC voltage 14 12 Gain (dB) Output Power (W) THD+N=10% 10 8 6 THD+N=1% 4 2 0 7 8 9 10 11 12 13 0 0.4 0.8 Supply Voltage (V) 19.5 3.5 Power Dissipation(W) Quiescent Current (mA) 4 19 18.5 18 17.5 17 2.8 2 1.5 1 16 0 10 11 Supply Voltage (V) 2.4 2.5 0.5 9 2 3 16.5 8 1.6 16.Power Dissipation vs. Output Power 14. Quesicent Current vs Supply Voltage 20 7 1.2 Volume Voltage (V) 12 0 13 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 08/2008 Rev 1.1 10 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 AP System One Analyzer AUX-0025 VDD 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 08/2008 Rev 1.1 11 PAM8606 6W Stereo Class-D Audio Power Amplifier with DC Volume Control Application Information 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 as heat sink. Ferrite Bead OUTP OUT+ 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. 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 as heat sink, isolating them into serval islands to avoid short between ground and power. Horizontal Polarization Power Analog Microelectronics , Inc www.poweranalog.com 08/2008 Rev 1.1 12 PAM8606 6W Stereo Class-D Audio Power Amplifier with DC Volume Control Volume Control Shutdown Operation A DC volume control section is integrated in PAM8606, controlling via VREF, VOLUME and VREFGND terminals. The voltage on VOLUME pin, without exceeding VREF, determines internal amplifier gain as listed in Table 1. The PAM8606 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. 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. For the best power-off pop performance, the amplifier should be set in shutdown mode prior to removing the power supply voltage. FADE Operation Internal 2.5V Bias Generator Capacitor Selection 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. 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. 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. 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. MUTE Operation Another function of the V2P5 capacitor is to filter high frequency noise on the internal 2.5V bias generator. The MUTE pin is an input for controlling the output state of the PAM8606. 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. Power Supply Decoupling, C S The PAM8606 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-series 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. Power Analog Microelectronics , Inc www.poweranalog.com 08/2008 Rev 1.1 13 PAM8606 6W Stereo Class-D Audio Power Amplifier with DC Volume Control -resistance (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. Differential Input The differential input stage of the amplifier eliminates noises that appear on the two input lines of the channel. To use the PAM8606 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 PAM8606 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. 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: Using low-ESR Capacitors f OSC = 2 π / (R OSC * C OSC) 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. 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 Ω 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 μ F BST capacitor to replace 220nF (pin18, pin19, pin42 and pin43) for lower than 100Hz applications. Short-circuit Protection The PAM8606 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. 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 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. Thermal Protection Thermal protection on the PAM8606 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. 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 0.1μF 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 Analog Microelectronics , Inc www.poweranalog.com 08/2008 Rev 1.1 14 PAM8606 6W Stereo Class-D Audio Power Amplifier with DC Volume Control Ordering Information PAM8606 X X Shipping(B:Tray) Package Type(X:TQFP) Part Number PAM8606XB Marking PAM8606 XATYWWLL Package Type Shipping TQFP 7mm*7mm 250 Units/ Tray Power Analog Microelectronics , Inc www.poweranalog.com 08/2008 Rev 1.1 15 PAM8606 6W Stereo Class-D Audio Power Amplifier with DC Volume Control Outline Dimension 48pin TQFP A2 A D A1 D1 F D2 C 25 36 24 0.25 37 L E E1 E2 L1 DETAIL: F b1 13 48 θ 1 b c1 c BASE METAL 12 WITH PLATING BB e SECTION B-B SYMBOL MILLIMETER MIN NOM MAX A - - 1.60 A1 0.05 0.15 A2 0.9 B 0.19 b1 SYMBOL MILLIMETER MIN NOM MAX E 8.80 9.00 9.20 0.25 E1 6.80 7.00 7.20 1.50 E2 5.00REF - 0.27 e 0.50BSC 0.18 0.20 0.23 L c 0.13 - 0.18 L1 c1 0.12 0.13 0.14 θ D 8.80 9.00 9.20 D1 6.80 7.00 7.20 D2 0.35 0.50 0.65 1.00BSC 0 - 8 5.00REF Power Analog Microelectronics , Inc www.poweranalog.com 08/2008 Rev 1.1 16