EV7722DF-02A 20W Stereo Class D Single Ended Audio Amplifier Evaluation Board The Future of Analog IC Technology DESCRIPTION FEATURES The EV7722DF-02A is the evaluation board for the MP7722. The MP7722 is a stereo 20W Class D Audio Amplifier. It is one of MPS’ second generation of fully integrated audio amplifiers which dramatically reduces solution size by integrating the following: • 180mΩ power MOSFETs • Startup / Shutdown pop elimination • Short circuit protection circuits • Mute / Standby • • • • • The MP7722 utilizes a single ended output structure with capacitor divider configuration capable of delivering 2x20W into 4Ω 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’ AAMTM proprietary variable frequency topology that delivers excellent linearity, fast response time and operates on a single power supply. 20W Output at VDD = 24V into a 4Ω load THD+N = 0.08% at 1W, 8Ω 90% Efficiency at 20W 9.5V to 24V Operation from a Single Supply Mute/Standby Modes (Sleep) APPLICATIONS • • • • • Flat Panel and Projection Televisions DVD and Surround Sound Systems Flat Panel Monitors Multimedia Computers Home Stereo Systems “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. ELECTRICAL SPECIFICATIONS Parameter Supply Voltage Symbol Value Units VDD 24 V EV7722DF-02A EVALUATION BOARD THD+N vs Output Power THD+N (%) 20 10 (L x W x H) 3.5” x 2.4” x 1.2” 8.9cm x 6.1cm x 3.0cm Board Number MPS IC Number EV7722DF-02A MP7722DF EV7722DF-02A Rev. 1.1 10/19/2007 VDD = 24V, f = 1KHz 1 0.1 0.01 0.1 1.0 POUT (W) www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2007 MPS. All Rights Reserved. 10 1 EV7722DF-02A Rev. 1.1 10/19/2007 GND VDD IN2 IN1 CN3 CN2 CN1 R17 NS R4 NS + + VCC EN EN + VCC C13 NS + VCC C25 NS C15 4.7nF 50V C6 3.9nF 50V 10 9 8 7 6 5 4 3 2 1 VCC FB2 11 12 13 14 15 16 17 18 19 + FB1 20 C24 NS NC BS2 VDD2 SW2 PGND2 NC BS1 MP7722 EN2 AGND2 REF2 IN2 EN1 NC VDD1 SW1 PGND1 U1 AGND1 IN1 REF1 NC VCC C2 NS D6 1N4148 D3 1N4148 + D5 6.2V D2 6.2V C26 22pF 50V D4 B130B C19 390pF 50V D1 B130B C11 390pF 50V OUT2+ OUT1+ VCC OUT2 SP1:B OUT1 SP1:A D7 + SW1 ENABLE ENABLE SWITCH DISABLE/EXT EN. OUT2-- OUT1-- + + + C1 22pF 50V TP1 EXT. ENABLE EN Optional Protection Circuit Q3 2N3904 Q2 2N3904 Q4 2N3904 Q1 2N3904 EN EN EV7722DF-02A – 20W STEREO CLASS D SINGLE ENDED AUDIO AMPLIFIER EVALUATION BOARD SCHEMATIC + www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2007 MPS. All Rights Reserved. 2 EV7722DF-02A – 20W STEREO CLASS D SINGLE ENDED AUDIO AMPLIFIER EV7722DF-02A BILL OF MATERIALS Qty Ref Value Description Package 2 C1, C26 22pF Ceramic Capacitor, 50V, C0G 4 C2, C13, C25, C24 3 C3, C23, C27 470µF Electrolytic Capacitor, 470uF, 35V, YXF Radial 4 C4, C9, C14, C21 2.2µF Electrolytic Capacitor, 25V, YXF Radial 2 C5, C22 2.2µF Ceramic Capacitor, 25V, X7R 1206 1 C6 3.9nF Ceramic Capacitor, 50V, X7R 0603 0603 2 2 C11, C19 390pF Ceramic Capacitor, 50V, C0G 0603 2 C12, C20 0.1µF Ceramic Capacitor, 50V, X7R 0603 1 C15 4.7nF Ceramic Capacitor, 50V, X7R 0603 1 C28 1µF Ceramic Capacitor, 16V, X7R 0805 2 CN1, CN2 Phone Jack, Female RCA 1 CN3 Banana Jack Connector 2 D1, D4 Schottky Diode, 1A/30V 2 D2, D5 2 D3, D6 1 D7 2 FB1, FB2 2 L1, L2 4 Q1, Q2, Q3, Q4 4 EV7722DF-02A Rev. 1.1 10/19/2007 Murata: GRM1885C1H220JA01 Not stuffed C7, C16, C29, C30 C8, C17, C31, C32 C10, C18 4 Manufacturer P/N 1000µF Electrolytic Capacitor, 25V, YXF Radial 0.47µF Ceramic Capacitor, 16V, X7R 0603 0.47µF Film Capacitor, 50V, X7R Radial 6.2V 10µH Rubycon: 35YXF470M Rubycon: 25YXF2M2 Murata: GRM31MR71E225KA93 Murata: GRM188R71H392KA01 Rubycon: 25VYXF1000M Murata: GRM188R71C474KA88D Any Murata: GRM1885C1H3901JA01 Murata: GRM188R71H104KA993D Murata: GRM188R71H472KA01 Murata: GRM21BR71C105KA01L Any Any SMB Zener Diode, 6.2V/250mW SOD323 Diode Switch, 75V, 100mA SOD323 LED 1206 Fuse, Ferrite Bead, 4A BS43 Inductor (13RHBP), 5.1A Radial NPN Transistor, 2N3904 SOT23 Diodes: B130B-13-F Diodes Inc.: BZT52C6V2S Diodes: 1N4148 Any Toko: BS43 Toko: 13RHBP-A7502BY-100M On Semi: MMBT3904 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2007 MPS. All Rights Reserved. 3 EV7722DF-02A – 20W STEREO CLASS D SINGLE ENDED AUDIO AMPLIFIER EV7722DF-02A BILL OF MATERIALS (continued) Qty Ref Value Description Package 2 R1, R20 121kΩ Resistor, 1% 0603 100kΩ Resistor, 1% 0603 2 R2, R3, R13, R18 R4, R17 2 4 Manufacturer P/N Yageo: RC0603FR-07120KL Yageo: RC0603FR-07100KL NS Not Stuffed R5, R15 10Ω Resistor, 5% 0603 2 R6, R12 24kΩ Resistor, 5% 0603 2 R7, R11 10kΩ Resistor, 1% 0603 2 R8, R14 10Ω Resistor, 5% 1206 2 R9, R19 10kΩ Resistor, 5% 0603 2 R10, R16 20kΩ Resistor, 5% 0603 1 R21 100kΩ Resistor, 5% 0603 2 R22,R23 18kΩ Resistor, 5% 0603 1 R24 3kΩ Resistor, 5% 0603 2 R25, R33 200kΩ Resistor, 5% 0603 4 R28, R29, R32, R34 560kΩ Resistor, 5% 0603 2 R26, R31 110kΩ Resistor, 5% 0603 Any 2 R27, R30 150kΩ Resistor, 5% 0603 Any 1 SP1 Speaker Connector, Red and Black Any 1 SW1 Switch slide, 12V, 0.1A Any 1 TP1 Pin (Test Point) Any 1 U1 MPS AUDIO IC MP7722DF EV7722DF-02A Rev. 1.1 10/19/2007 TSSOP20F Yageo: RC0603JR-0710RL Yageo: RC0603JR-0725RL Yageo: RC0603FR-0710KL Yageo: RC1206JR-0710RL Yageo: RC0603JR-0710KL Yageo: RC0603JR-0720KL Yageo: RC0603JR-07100KL Yageo: RC0603JR-0718KL Yageo: RC0603JR-073KL Yageo: RC0603JR-07200KL Yageo: RC0603JR-07560KL MPS: MP7722DF www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2007 MPS. All Rights Reserved. 4 EV7722DF-02A – 20W STEREO CLASS D SINGLE ENDED AUDIO AMPLIFIER TYPICAL PERFORMANCE CHARACTERISTICS THD+N vs Output Power 1 0.1 20 20 18 18 16 16 OUTPUT POWER (W) VDD = 24V, f = 1KHz OUTPUT POWER (W) THD+N (%) 20 10 14 12 10 8 THD=10% 6 THD=1% 4 2 0.01 0.1 1.0 0 10 VDD = 24V 0 5 10 15 20 VDD (V) 25 4 THD=1% 0 5 10 15 20 VDD (V) 25 Frequency Response VDD = 24V, AV = 12 30 +4 AMPLITUDE (dBr) THD+N (%) EFFICIENCY (%) THD=10% 6 VDD = 24V, 1W 80 1 0.1 20 +2 0 -2 -4 -6 -8 5 10 15 20 OUTPUT POWER (W) 25 0.01 20 100 1K FREQUENCY (Hz) 0 0 -20 -20 -40 -60 -80 -100 -10 10K AMPLITUDE (dBr) 0 AMPLITUDE (dBV) 0 8 THD+N vs Frequency 10 40 10 0 30 100 60 12 2 POUT (W) Efficiency vs Output Power 14 10 100 1K 10K FREQUENCY (Hz) -40 -60 -80 -100 -120 -120 20 EV7722DF-02A Rev. 1.1 10/19/2007 100 1K FREQUENCY (Hz) 10K 100 1K 10K FREQUENCY (Hz) www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2007 MPS. All Rights Reserved. 5 EV7722DF-02A – 20W STEREO CLASS D SINGLE ENDED AUDIO AMPLIFIER PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Silk Layer Figure 2—Top Layer Figure 3—Bottom Silk Layer Figure 4—Bottom and Bottom Silk Layer Figure 5—Connection Diagram EV7722DF-02A Rev. 1.1 10/19/2007 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2007 MPS. All Rights Reserved. 6 EV7722DF-02A – 20W STEREO CLASS D SINGLE ENDED AUDIO AMPLIFIER QUICK START GUIDE This board is set up from the factory for 24V operation. To use with a 12V power supply adjust the components as specified in the 12V operation Section 3 below. For more information, consult the MP7722 datasheet. 1. Power Requirements a. Power Supply: 24V, 6A maximum. b. 0VRMS to 1VRMS (Max) audio signal source. c. Speaker: 4Ω or 8Ω 2. Setup Condition for 24V Operation a. Connect the outputs to the external speakers. b. Adjust the power supply to 24V (do not turn on). c. Connect the power supply to the VDD terminals. d. Set the enable switch to the DISABLE position. e. Connect the audio input signal source to the amplifier inputs (IN1, IN2). f. Turn on the power supply to apply power to the board. 3. 12V Operation Modifications a. Change C6 to 1.8nF and C15 to 2.2nF. b. Remove R23, R26 and R31. Change R10 and R16 from 20kΩ to 10kΩ c. Adjust the power supply to 12V (do not turn on). d. Use same procedure for turn on as specified in Section 2. 4. Music Turn-On Sequence a. Set the enable switch to the ENABLE position. b. Audio should be heard from the speaker(s). 5. Music Turn-Off Sequence a. Set the enable switch to the DISABLE position. 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. EV7722DF-02A Rev. 1.1 10/19/2007 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2007 MPS. All Rights Reserved. 7