EV7745DF-01A 20W Stereo Class D Single Ended Audio Amplifier EV Board The Future of Analog IC Technology DESCRIPTION FEATURES The EV7745DF-01A is the evaluation board for the MP7745, a stereo 20W Class D Audio Amplifier. It is one of MPS’ products of fully integrated audio amplifiers which dramatically reduce solution size by integrating the following: • 250mΩ power MOSFETs • Startup / Shutdown pop elimination • Short circuit protection circuits The MP7745 utilizes a single ended output structure capable of delivering 2x20W into 4Ω speakers. MPS Class D Audio Amplifiers exhibit the high fidelity of a Class A/B amplifier at high efficiency. 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. • • • ELECTRICAL SPECIFICATIONS Parameter Supply Voltage Symbol Value Units VDD 24 V • • 2 x 20W Output at VDD = 24V into a 4Ω load THD+N = 0.05% at 1W, 8Ω, 1kHz 93% Efficiency at 19W and VDD=24V with 4Ω load Low Noise (103μV Typical) 9.5V to 26V Operation from a Single Supply APPLICATIONS • • • • • • Flat Panel TV Portable Docking Stations Surround Sound DVD Systems Televisions 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. EV7745DF-01A EVALUATION BOARD 20 10 5 2 1 0.5 0.2 0.1 0.05 (L x W x H) 3.5” x 2.5” x 1.2” 9.0cm x 6.3cm x 3.0cm Board Number MPS IC Number EV7745DF-01A MP7745DF EV7745DF-01A Rev. 1.0 10/19/2011 0.02 0.01 1 P www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 2 5 10 20 40 (W) 1 EV7745DF-01A – 20W STEREO CLASS D SINGLE ENDED AUDIO AMPLIFIER EVB 0.1 10 28K /50V 100 /50V/X7R 2200 50V 10k 0.1 10 50V 10k RCA NS 2.2 50V 10k 2.2 50V NS RCA EV7745DF-01A Rev. 1.0 10/19/2011 100k 100k 4.7nF 0.1 10k 5.6nF 100k 10 50V 100k NS NS 21K 100K 2.2 50V X7R 2.2 16V 82k 390pF 10 390pF 16V 100 50V 82k 10 22pF 22pF 200k 10 3.61A 10 3.61A 0.47 50V 0.47 50V 1000 50V 1000 50V 10 0.1 EVALUATION BOARD SCHEMATIC www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 2 EV7745DF-01A – 20W STEREO CLASS D SINGLE ENDED AUDIO AMPLIFIER EVB EV7745DF-01A BILL OF MATERIALS Qty Ref Value 2 C1, C26 22pF 2 C2, C24 NS 2 C3, C23 100uF 2 C4, C21 10uF 2 C5, C22 2.2uF 1 C6 5.6nF 2 C7,C16 1000uF 2 C8,C17 1uF 2 C9,C14 2.2uF 2 C10,C18 0.47uF 2 C11, C19 390pF 2 C12,C20 0.1uF 2 C13,C25 0.1uF 1 C15 4.7nF 1 C27 2200uF 2 R1,R20 R2,R3, R13, R18, R21 82.5KΩ Electrolytic Cap., 50V Electrolytic Cap., 50V Ceramic Capacitor,50V,X7R Ceramic Capacitor, 50V,X7R Electrolytic Cap., 50V Ceramic Capacitor,16V,X7R Electrolytic Cap., 50V FILM,50V Ceramic Capacitor,50V,C0G Ceramic Capacitor, 50V,X7R Ceramic Capacitor, 50V,X7R Ceramic Capacitor, 50V,X7R Electrolytic Cap, 50V Film Res., 1% 100KΩ 5 4 2 1 2 4 1 1 2 2 R4,R17, R10,R16 R5,R15 R6 R8,R14 R7,R9, R11,R19 R12 R22 D2,D1, D3,D4 FB1, FB2 EV7745DF-01A Rev. 1.0 10/19/2011 Description Ceramic Capacitor,50V,C0G Package Manufacturer Manufacturer P/N 0603 muRata GRM1885C1H220JA01D Radial Rubycon Radial Rubycon 1206 muRata GRM31CR71H225KA88L 0603 muRata GRM188R71H562KA01 Radial Rubycon 0603 muRata Radial Rubycon Radial any GRM188R71C105KA1 0603 muRata GRM1885C1H3901JA01D 0805 muRata GRM21BR71H104KA01L 0603 muRata GRM188R71H104KA93D 0603 muRata GRM188R71H472KA01D Radial Rubycon 0603 Yageo RC0603FR-0782K5L Film Res., 1% 0603 Yageo RC0603FR-07100KL 10Ω 21KΩ 10Ω Film Res., 5% Film Res., 1% Film Res., 5% 0603 0603 0805 Yageo 0603SAJ0100T5E RC0603FR-0721KL CR05T05NJ10R 10KΩ Film Res., 1% 0603 Yageo RC0603FR-0710KL 28KΩ 200KΩ Film Res., 1% Film Res., 5% 0603 0603 Yageo Yageo RC0603FR-0728KL RC0603JR-07200KL Ferrite Bead, 6A 1206 LION PB321611-320 NS NS www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 3 EV7745DF-01A – 20W STEREO CLASS D SINGLE ENDED AUDIO AMPLIFIER EVB EV7745DF-01A BILL OF MATERIALS (continued) Qty 2 Ref L1, L2 1 U1 1 SW1 1 CN3 2 CN1, CN2 1 TP1 1 SP1 Value 10uH EV7745DF-01A Rev. 1.0 10/19/2011 Description Inductor, 3.61A Class D Audio Amplifier Switch slide DPDT 12V .1A L=4 Banana Jack Connector Package Radial Manufacturer Toko Manufacturer P/N 10RHBP-#A671HN-100L TSSOP20F MPS MP7745DF Phono Jack, Female Test point PC MINI .040"D Speaker Connector www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 4 EV7745DF-01A – 20W STEREO CLASS D SINGLE ENDED AUDIO AMPLIFIER EVB PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Silk Layer Figure 2—Top Layer Figure 3—Bottom Silk Layer Figure 4—Bottom Layer EV7745DF-01A Rev. 1.0 10/19/2011 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 5 EV7745DF-01A – 20W STEREO CLASS D SINGLE ENDED AUDIO AMPLIFIER EVB QUICK START GUIDE VDD This board set up from the factory for 24V operation. To use with a 12V power supply, adjust the components as specified in the 12V Operation Modifications section below. For more information, consult the MP7745 datasheet. EXT-ENABLE EXT-EN GND GND MPS MP7745 Demo Board EV7745DF-01A IN1 IN2 For VDD=12V Remove R6 Figure 5—EV7745DF-01A Connection Diagram 1. Power Requirements a. Power supply: 9.5V to 26V, 3.5A maximum. b. 0V to 1.3VRMS (max) audio signal source. c. Speaker: 4Ω to 8Ω. 2. Setup Condition for 24V Operation a. Adjust the power supply to 24V (do not turn on). b. Connect the outputs to the external speakers. 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 3.3nF and C15 to 2.2nF components. b. Remove R6 from the demo board. c. Adjust the power supply to 12V (do not turn on). d. Do as step b~f specified in Section 2. 4. Music Turn-On Sequence a. Set the enable switch to the ENABLE position. 5. Music Turn-Off Sequence a. Set the enable switch to the DISABLE position. b. Turn off power supply. NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications. 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. EV7745DF-01A Rev. 1.0 10/19/2011 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 6