View PAM8606_4378253.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

PAM8606
6W Stereo Class-D Audio Power Amplifier with DC Volume Control
Key Features
n 6W@10%THD / Channel Output into a 8 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
1F 1F 1F
GND
1F 10 F
10 F
ROUTN
PGNDR
ROUTN
PVCCR
PVCCR
PGNDR
ROUTP
ROUTP
BSRN
BSRP
PVCCR
PVCCR
GND
GND
PGNDR
PGNDR
GND 1F GND
SHUTDOWN
RINN RINP
GND
1F
RINN
VCLAMPR
1F 1F
RINP
SD AGND
AVDD VREF
1F
V2P5
GND GND
VOLUME
VOLUME REFGND
PAM8606
AVCC
10 F
VCC 100nF MUTE GND
MUTE AGND
GND
AGND1
120K
FADE LINP LINN
GND
1F
FADE LINP LINN
ROSC COSC
220pF
VCLAMPL
GND GND GND
1F
1F
PGNDL
PGNDL
PGNDL
LOUTN
PVCCL
PVCCL
LOUTN
PVCCL
PVCCL
1F
1F
10 F
1F
1F
LOUTP
10 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 PVCCL 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
Pin 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
Pin 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
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......-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................................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 JC Maximum 8.7 C/W TQFP 7mm*7mm JA 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 (unless otherwise noted)
Symbol condition VDD THD+N=0.1%,f=1kHz,RL=8 Continuous Output Power Po THD+N=1.0%,f=1kHz,RL=8 THD+N=10%,f=1kHz,RL=8 , 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 =8 (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 =120k , C O S C = 22 0 pF 20Hz to 22 kHz, A-weighted PO=3W, RL=8 , 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 m 30 10 % mA A 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 (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.
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 ,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 ,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 ,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 22H 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
Application 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 (<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 as heat sink, isolating them into serval islands to avoid short between ground and power.
Horizontal Polarization
Power Analog Microelectronics , Inc www.poweranalog.com 12
08/2008 Rev 1.1
PAM8606
6W Stereo Class-D Audio Power Amplifier with DC Volume Control
Volume Control 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. 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 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. 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 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 Shutdown Operation 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. For the best power-off pop performance, the amplifier should be set in shutdown mode prior to removing the power supply voltage.
Power Analog Microelectronics , Inc www.poweranalog.com 13
08/2008 Rev 1.1
PAM8606
6W Stereo Class-D Audio Power Amplifier with DC Volume Control
-resistance (ESR) ceramic capacitor, typically 1F, is recommended, placing as close as possible to the device's VCC lead. To filter lowerfrequency 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 (pin18, pin19, pin42 and pin43) 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 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. 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 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. Thermal Protection Thermal protection on the PAM8606 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 14
08/2008 Rev 1.1
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 TQFP 7mm*7mm
Shipping 250 Units/ Tray
Power Analog Microelectronics , Inc www.poweranalog.com 15
08/2008 Rev 1.1
PAM8606
6W Stereo Class-D Audio Power Amplifier with DC Volume Control
Outline Dimension
48pin TQFP D D1 D2 C A1 F A2 A
36
25
37
24
0.25
L L1
E2
E1
E
DETAIL: F
b1
48
13
1 12
c1 c BASE METAL WITH PLATING SECTION B-B
b
e
BB
SYMBOL A A1 A2 B b1 c c1 D D1 D2
MILLIMETER MIN 0.05 0.9 0.19 0.18 0.13 0.12 8.80 6.80 0.20 0.13 9.00 7.00 5.00REF NOM 0.15 MAX 1.60 0.25 1.50 0.27 0.23 0.18 0.14 9.20 7.20
SYMBOL E E1 E2 e L L1
MILLIMETER MIN 8.80 6.80 NOM 9.00 7.00 5.00REF 0.50BSC 0.35 0 0.50 1.00BSC 8 0.65 MAX 9.20 7.20
Power Analog Microelectronics , Inc www.poweranalog.com 16
08/2008 Rev 1.1

▲Up To Search▲

Price & Availability of PAM8606

	To Download PAM8606 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .