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MP7722
2 x 20W Class D Stereo Single Ended Audio Amplifer
The Future of Analog IC Technology
DESCRIPTION
The MP7722 is a stereo 2 x 20W Class D Audio Amplifier. It is one of MPS' second generation fully integrated audio amplifiers which dramatically reduces solution size by integrating the following: 180m power MOSFETs Startup / Shutdown pop elimination Short circuit protection Mute / Standby The MP7722 utilizes a single ended output structure capable of delivering 2 x 20W into 4 speakers. MPS Class D Audio Amplifiers exhibit the high fidelity of a Class A/B amplifier at efficiencies greater than 90%. The circuit is based on the MPS' proprietary variable frequency topology that delivers low distortion, fast response time and operates on a single power supply.
FEATURES
* * * * * * * * * * * 2 x 20W Output at VDD = 24V into a 4 load THD+N = 0.06% at 1W, 8 93% Efficiency at 20W Low Noise (190V Typical) Switching Frequency Up to 1MHz 9.5V to 24V Operation from a Single Supply Integrated Startup and Shutdown Pop Elimination Circuit Thermal and Short Circuit Protection Integrated 180m Switches Mute/Standby Modes (Sleep) Thermally Enhanced 20-Pin TSSOP Package with Exposed Pad Surround Sound DVD Systems Televisions Flat Panel Monitors Multimedia Computers Home Stereo Systems
APPLICATIONS
* * * * *
"MPS" and "The Future of Analog IC Technology" are Registered Trademarks of Monolithic Power Systems, Inc. AAM (Analog Adaptive Modulation) is a Trademark of Monolithic Power Systems, Inc.
TYPICAL APPLICATION
VDD
THD+N vs Output Power
2
24V, f = 1KHz
REF1 17
10
BS1 CH1 INPUT 3 IN1
THD+N (%)
SW1
19 CH1 OUTPUT
MP7722
8 REF2 BS2 12
1
CH2 INPUT EN
7 6 10 4 9
IN2 EN1 EN2 AGND1 AGND2
VDD1
SW2 14 18 20 13 15
0.1
VDD
PGND1 VDD2 PGND2
CH2 OUTPUT
0.01
0.1
1 10 OUTPUT POWER (W)
MP7722 Rev. 1.3 9/25/2006
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MP7722 - 2 x 20W CLASS D STEREO SINGLE ENDED AUDIO AMPLIFIER
PACKAGE REFERENCE
TOP VIEW NC REF1 IN1 AGND1 NC EN1 IN2 REF2 AGND2 EN2 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 PGND1 SW1 VDD1 BS1 NC PGND2 SW2 VDD2 BS2 NC
ABSOLUTE MAXIMUM RATINGS (1)
Supply Voltage VDD ...................................... 26V BS Voltage.................. VSW - 0.3V to VSW + 6.5V Enable Voltage VEN ........................ -0.3V to +6V VSW, VPIN, VNIN ........................... -1V to VDD + 1V AGND to PGND.......................... -0.3V to +0.3V Junction Temperature............................... 150C Lead Temperature ....................................260C Storage Temperature ..............-65C to +150C
Recommended Operating Conditions
(2)
Supply Voltage VDD .......................... 9.5V to 24V Operating Temperature TA.........-40C to +85C
Thermal Resistance
(3)
TSSOP20F ............................. 40 ....... 6.... C/W
Notes: 1) Exceeding these ratings may damage the device. 2) The device is not guaranteed to function outside of its operating conditions. 3) Measured on approximately 1" square of 1 oz copper.
JA
JC
EXPOSED PAD (CONNECT TO PGND)
Part Number* MP7722DF *
Package TSSOP20F
Temperature -40C to +85C
For Tape & Reel, add suffix -Z (eg. MP7722DF-Z) For Lead Free, add suffix -LF (eg. MP7722DF-LF-Z)
ELECTRICAL CHARACTERISTICS
VDD = 24V, VEN = 5V, TA = +25C, unless otherwise noted.
Parameters Supply Current Standby Current Quiescent Current Output Drivers SW On Resistance Short Circuit Current Inputs REF1/2, IN1/2 Input Common Mode Voltage Range REF1/2, IN1/2 Input Current EN Enable Threshold Voltage EN Enable Input Current Thermal Shutdown Thermal Shutdown Trip Point Thermal Shutdown Hysteresis Standby Current Quiescent Current VEN = 0V Symbol Condition VEN = 0V Min Typ 2 3 0.18 5.0 0 VPIN = VNIN = 12V VEN Rising VEN Falling VEN = 5V TJ Rising VDD 2 1 1.4 1.2 1 150 30 260 23 VDD - 1.5 5 2.0 Max 10 6 Units A mA A V A V V A C C A mA
Sourcing and Sinking Sourcing and Sinking
0.4
MP7722 Rev. 1.3 9/25/2006
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MP7722 - 2 x 20W CLASS D STEREO SINGLE ENDED AUDIO AMPLIFIER
OPERATING SPECIFICATIONS
Circuit of Figure 1, VDD = 24V, VEN = 5V, TA = +25C, unless otherwise noted.
Parameters Power Output Symbol Condition f = 1KHz, THD+N = 10%, 4 Load f = 1KHz, THD+N = 10%, 8 Load POUT = 1W, f = 1KHz, 4 Load POUT = 1W, f = 1KHz, 8 Load f = 1KHz, POUT = 1W, 4 Load f = 1KHz, POUT = 1W, 8 Load Min Typ 20 10 0.16 0.06 90 95 20 93 190 60 Max Units W W % % % % KHz dB V dB
THD+ Noise
Efficiency Maximum Power Bandwidth Dynamic Range Noise Floor Power Supply Rejection
A-Weighted f = 1KHz
PIN FUNCTIONS
Pin # 1, 5, 11, 16 2 3 4 6 7 8 9 10 12 13 14 15 Name NC REF1 IN1 EN1 IN2 REF2 Description No Connect. Not internally connected Amplifier 1 Reference. REF1 is the reference point for amplifier 1. Use a resistive voltage divider to set the voltage at REF1 to VDD/2. Amplifier 1 Input. IN1 is the inverting input for amplifier 1. Enable Input 1. EN1 must be connected to EN2. Drive EN1 high to enable MP7722; low to disable it. Amplifier 2 Input. IN2 is the inverting input for amplifier 2. Amplifier 2 Reference. REF2 is the reference point for amplifier 2. Use a resistive voltage divider to set the voltage at REF1 to VDD/2. Enable Input 2. EN2 must be connected to EN1. Drive high to enable MP7722, drive low to disable. High-Side MOSFET Bootstrap Input for Amplifier 2. A capacitor from BS2 to SW2 supplies the gate drive current to the internal high-side MOSFET. Connect a 1F capacitor from SW2 to BS2. Power Supply Input. Bypass VDD2 to PGND2 with a 1F X7R capacitor (in addition to the main bulk capacitor), placed close to the IC PIN13 and PIN15. Switched Power Output. SW2 is the output of Amplifier 2. Connect the LC filter to this pin.
AGND1 Analog Ground 1. Connect AGND1 to AGND2.
AGND2 Analog Ground 2. Connect AGND2 to AGND1. EN2 BS2 VDD2 SW2
PGND2 Power Ground for Amplifier 2. Connect PGND2 to PGND1.
MP7722 Rev. 1.3 9/25/2006
www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2006 MPS. All Rights Reserved.
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MP7722 - 2 x 20W CLASS D STEREO SINGLE ENDED AUDIO AMPLIFIER
PIN FUNCTIONS (continued)
Pin # 17 18 19 20 Name BS1 VDD1 SW1 Description High-Side MOSFET Bootstrap Input for Amplifier 1. A capacitor from BS1 to SW1 supplies the gate drive current to the internal high-side MOSFET. Connect a 1F capacitor from SW1 to BS1. See Figure 1. Power Supply Input. Bypass VDD1 to PGND1 with a 1F X7R capacitor (in addition to the main bulk capacitor), placed close to the IC PIN18 and PIN20. Switched Power Output. SW1 is the output of Amplifier 1. Connect the LC filter to this pin. See Figure 1.
PGND1 Power Ground for Amplifier 1. Connect PGND1 to PGND2. See Figure 1.
TYPICAL PERFORMANCE CHARACTERISTICS
20 10
20 10
THD+N (%)
THD+N (%)
1 f=1KHz 0.1
f=10KHz
1 f=1KHz 0.1 f=100Hz 0.01
f=10KHz
f=100Hz 0.01 0.1 1 POUT (W) 10 0.1
1 POUT (W)
10
100
100
10
THD+N (%) THD+N (%)
10
1
1
0.1
0.1
0.01
20
100 1K FREQUENCY (Hz)
10K
0.01
20
100 1K FREQUENCY (Hz)
10K
MP7722 Rev. 1.3 9/25/2006
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MP7722 - 2 x 20W CLASS D STEREO SINGLE ENDED AUDIO AMPLIFIER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
0 -30 -60 -90 -120 -150
AMPLITUDE (dBr)
0 -10 -20 -30 -40 -50 -60 -70
AMPLITUDE (dBV)
-80 -90 -100 100 1K 10K FREQUENCY (Hz)
20
100 1K FREQUENCY (Hz)
10K
+0 -20
AMPLITUDE (dBr) AMPLITUDE (dB)
+4 +2 0 -2 -4 -6 -8 20 100 1K FREQUENCY (Hz) 10K -10 20 100 1K 10K FREQUENCY (Hz) 40K
-40 -60 -80 -100
100 90 80
EFFICIENCY (%)
Efficiency vs POUT
25 20
POUT (W)
POUT vs VDD
70 60 50 40 30 20 10 0 0 5 10 15 20 25 OUTPUT POWER (W) 30 0 5 10 15 20 25 VDD (V) 30 35 5 15 10
MP7722 Rev. 1.3 9/25/2006
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MP7722 - 2 x 20W CLASS D STEREO SINGLE ENDED AUDIO AMPLIFIER
OPERATION
The MP7722 uses Monolithic Power Systems' patented Analog Adaptive ModulationTM to convert the audio input signal into pulses of power that, when filtered through an external inductor-capacitor filter, reproduce the amplified signal across the load. Because of the switching Class D output stage, power dissipation in the amplifier is drastically reduced when compared to Class A, B or A/B amplifiers while providing high fidelity and low distortion. The voltage gain is set by the combination of the input resistor RIN and the feedback resistor RFB and is calculated by the equation:
AV = -R FB R IN
Pop Elimination The capacitors COUT1 and COUT2 block the DC signal and pass only the AC signals to the load. To insure that the amplifier passes low frequency signals, the capacitor values need to be chosen such that the time constant of COUT x RLOAD is long. During startup, these capacitors need to be charged up to the DC operating point, which is typically at 1/2 of VDD. The MP7722 includes special integrated circuitry that carefully controls the pre-charging of these capacitors, eliminating the turn-on and turn-off pop normally associated with the charging of the AC coupling capacitors. Short Circuit/Overload Protection The MP7722 has internal overload and short circuit protection. The currents in both the high-side and low-side MOSFETs are measured and if the current exceeds the 5.0A short circuit current limit, both MOSFETs are turned off. The MP7722 then restarts with the same power up sequence that is used for normal starting to prevent a pop from occurring after a short circuit condition is removed. Mute/Enable Function The MP7722 EN inputs are active high enable controls. To enable the MP7722, drive EN with a 2.0V or higher voltage. To disable the amplifier, drive EN below 0.4V. While the MP7722 is disabled, the VDD operating current is less than 10A and the output driver MOSFETs are turned off. The MP7722 requires approximately 500ms from the time that EN is asserted (driven high) to when the amplifier begins normal operation.
Where for Channel 1: RFB=RFB1 and RIN=RIN1 and for Channel 2: RFB=RFB2 and RIN=RIN2. The MP7722 includes four high-power MOSFETS wherein for each channel the output driver stage uses two 180m N-Channel MOSFETs to deliver the pulses to the LC output filter that in turn drives the load. To fully enhance the high-side MOSFET, the gate is driven to a voltage higher than VDD by the bootstrap capacitor between SW and BS. While the output is driven low, the bootstrap capacitor is charged from VDD. The gate of the high-side MOSFET is driven high from the voltage at BS, forcing the MOSFET gate to a voltage higher than VDD and allowing the MOSFET to fully turn on, reducing power loss in the amplifier.
MP7722 Rev. 1.3 9/25/2006
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MP7722 - 2 x 20W CLASS D STEREO SINGLE ENDED AUDIO AMPLIFIER
APPLICATION INFORMATION
COMPONENT SELECTION
The MP7722 uses a minimum number of external components to complete a stereo Class D audio amplifier. The circuit of Figure 1 is optimized for a 24V power supply and a 1.5V RMS maximum input signal. This circuit should be suitable for most applications. However, if this circuit is not suitable, use the following sections to determine how to customize the amplifier for a particular application. Setting the Voltage Gain The maximum output voltage swing is limited by the power supply. To achieve the maximum power out of the MP7722 amplifier, the gain resistors should be set such that the maximum input signal results in an output voltage swing that reaches the supply limit (clipping). The maximum output voltage swing at clipping is approximately VDD/2. To achieve clipping for a given input signal voltage, where VIN(pk) is the peak input voltage, the voltage gain is:
A V (MAX) = VDD 2 x VIN (pk )
The optimum quiescent switching frequency is approximately 700KHz to 800KHz. Refer to Table 1 for recommended values. Table 1--Switching Frequency vs. VDD, Timing Capacitor and Feedback Resistor (see Figure 1)
Gain (V/V) 3.9 8.2 8.3 17.4 5.6 8.2 11.9 17.4 33.0 Gain (dB) 15.0 18.3 21.5 24.8 15.0 18.3 21.5 24.8 30.4 RFB (k) 39 82 39 82 56 82 56 82 330 RIN (k) 10 10 4.7 4.7 10 10 4.7 4.7 10 CINT 6.8nF 3.3nF 6.8nF 3.3nF 8.2nF 5.6nF 8.2nF 5.6nF 1.8nF FSW 660KHz 660KHz 660KHz 660KHz 670KHz 720KHz 670KHz 720KHz 700KHz VDD (V) 12 12 12 12 24 24 24 24 24
The voltage gain setting results in the peak output voltage approaching its maximum for the maximum input signal. There are applications where it is desirable to allow the amplifier to overdrive slightly, allowing the THD to increase at higher power levels (as the output signal continues to go further into clipping), and so a higher gain than AV (max) is required. Setting the Switching Frequency The idle switching frequency (the switching frequency when no audio input is present) is a function of several variables: the supply voltage VDD, the timing capacitor CINT and the feedback resistor RFB. For the MP7722, the idle switching frequencies for CH1 and CH2 are independent of each other and are a function of their own associated components. The proper setting of the "idle frequency" is important for obtaining optimum performance. If the frequency is set too high, the result will be more power loss and high distortion, while setting the idle switching frequency too low results in more inductor ripple, causing more output voltage ripple with increased the output noise.
MP7722 Rev. 1.3 9/25/2006
Choosing the LC Filter The Inductor-Capacitor (LC) filter converts the pulse train at SW to the output voltage that drives the speaker. Typical values for the LC filter are a 10H inductor and a 0.47F capacitor. The characteristic frequency of the LC filter needs to be high enough to allow high frequency audio to the output, yet needs to be low enough to filter out high frequency products of the pulses from SW. The characteristic frequency of the LC filter is:
f0 = 1 2 LC
The voltage ripple at the output is approximated by the equation:
f VRIPPLE VDD x 0 f SW
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MP7722 - 2 x 20W CLASS D STEREO SINGLE ENDED AUDIO AMPLIFIER The quality factor (Q) of the LC filter is important. If this is too low output noise will increase, and if this is too high then peaking may occur at high signal frequencies reducing the passband flatness. The circuit Q is set by the load resistance (speaker resistance, typically 4 or 8) and is calculated as:
Q = 0 x L L = 2 x f 0 x R R
Where 0 is the characteristic frequency in radians per second and f0 is in Hz. Use a LC filter with Q between 0.7 and 2. The actual output ripple and noise is greatly affected by the type of inductor and capacitor used in the LC filter. Use a film capacitor and an inductor with sufficient power handling capability to supply the output current to the load. The inductor should exhibit soft saturation characteristics. If the inductor exhibits hard saturation, it should operate well below the saturation current. Gapped ferrite, MPP, Powdered Iron or similar type toroidal cores are recommended. If open or shielded bobbin ferrite cores are used for multi-channel designs, make sure that the start windings of each inductor line up (all starts going toward SW pin or all starts going toward the output) to prevent crosstalk or other channel-to-channel interference. Output Coupling Capacitors The output AC coupling capacitors COUT1 and COUT2 serve to block DC voltages and thus pass only the amplified AC signal from the LC filter to the load. The combination of the coupling capacitor and the load resistance results in a first-order high-pass filter. The values of COUT1 and COUT2 should be selected such that the required minimum frequency is still allowed to pass. The output corner frequency (-3dB point), fOUT, can be calculated as:
f OUT = 1 2 x x R LOAD x C OUT
Input Coupling Capacitors The input coupling capacitors CIN1 and CIN2 are used to pass only the AC signal at the input. In a typical system application, the source input signal is typically centered around the circuit ground, while the MP7722 input is at half the power supply voltage (VDD/2). The input coupling capacitors transmit the AC signal from the source to the MP7722 while blocking the DC voltage. Choose the input coupling capacitors such that the corner frequency (fIN) is less than the passband frequency. The corner frequency is calculated as:
fIN = 1 2 x x R IN x C IN
Power Source For maximum output power, the amplifier circuit requires a regulated external power source to supply the power to the amplifier. A higher power supply voltage allows more power to be delivered to a given load resistance. However if the power source voltage exceeds the maximum operating voltage of 24V, the MP7722 may sustain permanent damage. It is very important to bypass the power supply pins with 1F X7R ceramic capacitors. Power Supply Pumping It is also very important to bypass the power supply with a large aluminum electrolytic capacitor. It is recommended to use a value of at least 2200F. This is necessary to prevent the supply voltage from getting pumped up to a level that exceeds the absolute maximum rating. Supply pumping occurs in single-ended Class D amplifiers, and is caused by rapid switch transitions where current is pumped back up into the supply line. The large capacitor is necessary to absorb this current and prevent VDD from rising too high.
Set the output corner frequency at or below the minimum required frequency. The output coupling capacitor carries the full load current, so the capacitor should be chosen such that its ripple current rating is greater than the maximum load current. Low ESR aluminum electrolytic capacitors are recommended.
MP7722 Rev. 1.3 9/25/2006 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2006 MPS. All Rights Reserved.
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MP7722 - 2 x 20W CLASS D STEREO SINGLE ENDED AUDIO AMPLIFIER PCB Layout The circuit layout is critical for optimum performance and low output distortion and noise. Place the following components as close to the MP7722 as possible: Power Supply Bypass, CBYP CBYP1 and CBYP2 carry the transient current for the switching power stage. To prevent overstressing of the MP7722 and excessive noise at the output, place CBYP1 as close to pins 18 (VDD1) and 20 (PGND1) as possible and also place CBYP2 as close to pins 13 (VDD2) and 15 (PGND2) as possible. Output Catch Diodes DSH1, DSL1, DSH2 and DSL2 carry the current over the dead-time while the MOSFET switches are off. Place the diodes as close to the MP7722 as possible. Timing Capacitors CINT1 and CINT2 are used to set the amplifier switching frequencies and are typically on the order of a few nF. Place CINT1 as close to pins 2 and 3 as possible to reduce distortion and noise. Likewise, place CINT2 as close to pins 7 and 8 as possible. Reference Bypass Capacitors CR1 and CR2 filter the 1/2 VDD reference voltages. Place CR1 and CR2 as close to the IC as possible to improve power supply rejection and reduce distortion and noise at the output. When laying out the PCB, use two separate ground planes, analog ground (AGND) and power ground (PGND), and connect the two grounds together at a single point to prevent noise injection into the amplifier input to reduce distortion. Make sure that any traces carrying the switch node (SW) voltages are separated far from any input signal traces. If it is required to run the SW trace near the input, shield the input with a ground plane between the traces. For multiple channel applications, make sure that each channel is physically separated to prevent crosstalk. Make sure that all inductors used on a single circuit board have the same orientation. Also, make sure that the power supply is routed from the source to each channel individually, not serially. This prevents channel-to-channel coupling through the power supply input. Electro-Magnetic Interference (EMI) Considerations Due to the switching nature of the Class D amplifier, care must be taken to minimize the effects of electromagnetic interference from the amplifier. However, with proper component selection and careful attention to circuit layout, the effects of the EMI due to the amplifier switching can be minimized. The power inductors are a potential source of radiated emissions. For the best EMI performance use toroidal inductors, since the magnetic field is well contained inside the core. However toroidal inductors can be expensive to wind. For a more economical solution, use shielded gapped ferrite or shielded ferrite bobbin core inductors. These inductors typically do not contain the field as well as toroidal inductors, but usually can achieve a better balance of good EMI performance with low cost. The size of high-current loops that carry rapidly changing currents needs to be minimized. To do this, make sure that the VDD bypass capacitors and the Schottky Catch diodes are as close to the MP7722 as possible. Nodes that carry rapidly changing voltages, such as SW, need to be made as small as possible. If sensitive traces run near a trace connected to SW, place a ground shield between the traces.
MP7722 Rev. 1.3 9/25/2006
www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2006 MPS. All Rights Reserved.
9
MP7722 - 2 x 20W CLASS D STEREO SINGLE ENDED AUDIO AMPLIFIER
TYPICAL APPLICATION CIRCUIT
CFB1 VDD RRH1 2 CR1 CIN1 RIN1 VDD RRH2 8 CR2 CIN2 RIN2 RRL2 CINT2 7 6 EN 10 4 9 IN2 EN1 EN2 AGND1 AGND2 RFB2 CFB2 VDD2 PGND2 13 15 CBYP2 SW1 14 18 VDD2 20 PGND2 REF2 RRL1 CINT1 3 REF1 17 CBS1 SW1 19 VDD VDD DSH2 COUT2 CH2 OUTPUT DSL1 RFB1 VDD DBS3 RBS1 VDD DBS1 DSH1 COUT1 CH1 OUTPUT
BS1 IN1
CH1 INPUT
LF1
MP7722
BS2 12 RBS2 DBS4
CF1
CBS2
DBS2
LF2
CH2 INPUT
CBYP1
VDD CVDDBYP
DSL2
CF2
Figure 1--2 x 20W Stereo Typical Application Circuit
MP7722 Rev. 1.3 9/25/2006
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MP7722 - 2 x 20W CLASS D STEREO SINGLE ENDED AUDIO AMPLIFIER
PACKAGE INFORMATION
TSSOP20F (EXPOSED PAD)
4.40 TYP 6.40 6.60 0.40 TYP 11 1.60 TYP 0.65 BSC
20
PIN 1 ID
4.30 4.50
6.20 6.60
3.20 TYP
5.80 TYP
1
10
TOP VIEW
RECOMMENDED LAND PATTERN
0.80 1.05 0.19 0.30 0.65 BSC 0.00 0.15
1.20 MAX SEATING PLANE SEE DETAIL "A"
0.09 0.20
SIDE VIEW FRONT VIEW
GAUGE PLANE 0.25 BSC 3.80 4.30 0o-8o 0.45 0.75
DETAIL A
2.60 3.10
NOTE:
1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH, PROTRUSION OR GATE BURR. 3) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. 4) LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.10 MILLIMETERS MAX. 5) DRAWING CONFORMS TO JEDEC MO-153, VARIATION ACT. 6) DRAWING IS NOT TO SCALE.
BOTTOM VIEW
NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications.
MP7722 Rev. 1.3 9/25/2006 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2006 MPS. All Rights Reserved.
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