MP7720DS

TM EV0030 (MP7720DS) 20W Stereo Class D Single Ended Audio Amplifier EVALUATION BOARD The Future of Analog IC Technology TM GENERAL DESCRIPTION The EV0030 is the evaluation board for the MP7720, a mono 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 MP7720 utilizes a single ended output structure capable of delivering 20W 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 PSRR, fast response time and operates on a single power supply. FEATURES • • • • • • • • • • • • • • • • 20W Output at VDD = 24V into a 4Ω load THD+N = 0.04% at 1W, 8Ω 93% Efficiency at 20W Low Noise (190µV Typical) Switching Frequency Up to 1MHz 9.5V to 24V Operation from a Single Supply Integrated Startup and Shutdown Pop Elimination Circuit Thermal Protection Integrated 180mΩ Switches Mute/Standby Modes (Sleep) Available in Tiny 8-Pin SOIC and PDIP Packages Surround Sound DVD Systems Televisions Flat Panel Monitors Multimedia Computers Home Stereo Systems APPLICATIONS ELECTRICAL SPECIFICATIONS Parameter Supply Voltage Symbol VDD Value 24 Units V “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. EV0030 EVALUATION BOARD THD+N vs Power (24V, 1KHz) 20 10 THD+N (%) 1 0.1 Dimensions (2.4”X x 3.5”Y x 1.2”Z) Board Number EV0030 EV0030 Rev. 1.6 6/13/2005 0.01 0.1 MPS IC Number MP7720DS 1 POWER (W) 10 30 MP7720-TPC01 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 1 TM EV0030 – 20W STEREO CLASS D SINGLE ENDED AUDIO AMPLIFIER EVALUATION BOARD EVALUATION BOARD SCHEMATIC C15 22pF VDD VDD C6 NS FB1 + CN100 RCA IN1 R2 NS 1 U1 PIN NIN AGND EN PGND SW VDD BS 8 7 6 5 C11 3.3nF 2 3 EN C2 NS 4 D1 ZENER 6.2V OUT1 LEFT-CHANNEL SPEAKER SP1:B MP7720 C9 390pF D6 MBRS130LTR C16 22pF VDD VDD C5 NS FB2 + CN101 RCA IN2 R1 NS 1 U2 PIN NIN AGND EN PGND SW VDD BS 8 7 6 5 C12 3.3nF 2 3 + EN C4 NS 4 D3 ZENER 6.2V OUT2 RIGHT-CHANNEL SPEAKER SP1:A MP7720 C19 390pF D8 MBRS130LTR CN102 VDD GND + VDD VDD SW100 EXT_ENABLE TP1 EN LED1206 LED100 EV0030_S01 + EV0030 Rev. 1.6 6/13/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 2 TM EV0030 – 20W STEREO CLASS D SINGLE ENDED AUDIO AMPLIFIER EVALUATION BOARD EV0030 BILL OF MATERIALS Qty 3 4 2 2 2 2 2 2 2 2 1 2 2 2 2 2 2 7 2 2 2 1 4 2 Ref C1, C3, C124 C2, C4, C5, C6 C9, C19 C11, C12 C13, C14 C15, C16 C17, C18 C21, C22 C23, C24 C25, C26 C27 C102, C114 D1, D3 D6, D8 FB1, FB2 L1, L2 R1, R2 R3, R4, R5, R6, R13, R14, R113 R7, R11 R8, R12 R17, R18 R112 R201, R202, R203, R204 U1, U2 10µH NS 10kΩ 10Ω 10Ω 120kΩ 3kΩ 100kΩ Value 1µF NS 390pF 3.3nF 100µF 22pF 1µF 0.1µF 0.47µF Description Ceramic Capacitor, X5R, 16V Not Stuffed Ceramic Capacitor, X7R, 50V Ceramic Capacitor, X7R, 50V Electrolytic Capacitor, 35V Ceramic Capacitor, NPO, 50V Ceramic Capacitor, X7R, 25V Ceramic Capacitor, X7R, 50V Metallized Film Capacitor, 50V SM0805 SM0805 Radial SM0805 SM1206 SM0805 Radial Radial Radial SM1206 MINIMELF SMB SM1210 Radial/10RYTL Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Diodes Inc IRF FAIR-RITE Toko ECU-V1H391KBN ECJ-2VB1H472K EEU-FC1V101 ECJ-2VC1H220J ECJ-3YB1E105K ECJ-2YB1H104K ECQ-V1H474JL ECA-1EHG102 EEU-FC1E222 ECJ-3YB1C475M ZMM5234B-7 MBRS130LTR 2512067007Y3 A7024LYF-100K Package SM0805 Manufacturer Manufacturer P/N Panasonic ECJ-2FB1C105K 1000µF Electrolytic Capacitor, 25V 2200µF Electrolytic Capacitor, 25V 4.7µF Ceramic Capacitor, X5R, 16V Zener Diode, 6.2V Schottky Diode, 30V, 1A Ferrite Bead Inductor, 3.5A Not Stuffed Ceramic Resistor, 1% Ceramic Resistor, 5% Ceramic Resistor, 5% Ceramic Resistor, 5% Ceramic Resistor, 5% Ceramic Resistor, 1% Amplifier SM0805 SM0805 SM1206 SM0805 SM0805 SM0805 SOIC8 Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic MPS ERJ-6ENF1002V ERJ-6GEYJ100V ERJ-8GEYJ100V ERJ-6GEYJ124V ERJ-6GEYJ302V ERJ-6ENF1003V MP7720 EV0030 Rev. 1.6 6/13/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 3 TM EV0030 – 20W STEREO CLASS D SINGLE ENDED AUDIO AMPLIFIER EVALUATION BOARD PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Silk Layer Figure 2—Top Layer Figure 3—Bottom Silk Layer Figure 4—Bottom Layer VDD 24V GND IN 1 + _ _ OUT SP1 4Ω Min OUT SP2 4Ω Min IN 2 MPS MP7720 EV0030 + Figure 5—EV0030 Connection Diagram EV0030 Rev. 1.6 6/13/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 4 TM EV0030 – 20W STEREO CLASS D SINGLE ENDED AUDIO AMPLIFIER EVALUATION BOARD TYPICAL PERFORMANCE CHARACTERISTICS 20 10 20 10 100 10 THD+N (%) THD+N (%) 1 f=1KHz 0.1 f=10KHz f=100Hz 0.01 0.1 1 POUT (W) MP7720-TPC02 1 f=1KHz f=10KHz 0.1 f=100Hz THD+N (%) 1 0.1 10 30 0.01 0.1 1 POUT (W) 10 30 0.01 20 100 1K FREQUENCY (Hz) 10K MP7720-TPC04 MP7720-TPC03 100 0 -20 AMPLITUDE (dBV) -40 -60 -80 -100 -120 1 0.1 0.01 20 100 1K FREQUENCY (Hz) 10K MP7720-TPC05 -140 20 100 1K FREQUENCY (Hz) 10K MP7720-TPC06 AMPLITUDE (dBr) 10 THD+N (%) 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 100 1K 10K FREQUENCY (Hz) MP7720-TPC07 Frequency Response (Ref=2Vrms, AV=8.2) +4 +2 AMPLITUDE (dBr) EFFICIENCY (%) 100 90 80 70 60 50 40 30 20 10 0 Efficiency vs POUT 25 20 POUT (W) POUT vs VDD 0 -2 -4 -6 -8 -10 20 100 1K 10K FREQUENCY (Hz) 40K 15 10 5 0 0 5 10 15 20 25 OUTPUT POWER (W) 30 5 10 15 20 25 VDD (V) 30 35 MP7720-TPC08 MP7720-TPC09 MP7720-TPC10 EV0030 Rev. 1.6 6/13/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 5 TM EV0030 – 20W STEREO CLASS D SINGLE ENDED AUDIO AMPLIFIER EVALUATION BOARD 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 MP7720 datasheet. 1. Power Requirements a. Power supply: 24V, 6A maximum. b. 0V 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 C11 and C12 to 2.2nF components. Change R13 and R14 to 2kΩ (consult the MP7720 datasheet for more details). b. Adjust the power supply to 12V (do not turn on). c. 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. 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. EV0030 Rev. 1.6 6/13/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 6