EV0066 Monolithic Power Systems MP7720: Mini 20W Stereo Class D Single Ended Audio Amplifier EVALUATION BOARD General Description Absolute Maximum Ratings The EV0066 is a 20W stereo evaluation board featuring MPS’ MP7720 Class D Single Ended Audio Amplifier. The EV0066 can deliver 20W into a 4Ω load with a 24V input supply. Supply Voltage VDD Signal Input Voltage Enable Voltage The MP7720 is a mono 20W Class D Audio Amplifier. It is one of MPS’s second generation of fully integrated audio amplifiers which dramatically reduces solution size by integrating the following: 180mΩ power MOSFETs Start up / shut down pop elimination Short circuit protection circuits The MP7720 utilizes a single ended output structure capable of delivering 20W into 4Ω speakers. As in all other MPS Class D Audio Amplifiers, this device exhibits the high fidelity of a Class A/B amplifier at efficiencies greater than 90%. Ordering Information Board Number EV0066 MPS IC Number MP7720DS EV0066 Evaluation Board 26V ±2V p-p –0.3 to 6V Recommended Operating Conditions Input Voltage VDD Signal Input Voltage Signal Input Frequency Signal Source Impedance External Enable Input Speaker Resistance 7.5V to 24V 1V rms 20Hz to 20KHz <600Ω 0V to 5V 4Ω to 8Ω Performance Maximum Output Power (10% THD, 4Ω) 20W Maximum Output Power (10% THD, 8Ω) 10W THD (1kHz, 1W) 0.05% Power Efficiency (POUT=20W, 4Ω) 90% Features 20W Output at 24V Input Into a 4Ω Load 0.05% THD+N @ 2W, 1KHz Into 4Ω Load 0.05% THD+N @ 2W, 1KHz Into 8Ω Load 90% Efficiency at 20W Integrated Start-Up and Shut-Down Pop Elimination Circuit Thermal Protection Integrated 180mΩ Power Switches Mute / Standby Mode (Sleep) Applications Televisions Home Stereo Systems Monitors (Actual Size = 1.0”X x 1.4”Y) EV0066 Rev 1.1 05/12/04 www.monolithicpower.com 1 EV0066 Monolithic Power Systems MP7720: Mini 20W Stereo Class D Single Ended Audio Amplifier EVALUATION BOARD Figure 2: EV0066 Stereo Single Ended Schematic EV0066 Rev 1.1 05/12/04 www.monolithicpower.com 2 EV0066 Monolithic Power Systems MP7720: Mini 20W Stereo Class D Single Ended Audio Amplifier EVALUATION BOARD Table 1: EV0066 Bill of Materials Component Description Package Qty U2, U3 MP7720DS SOIC8 2 D3, D5 1N5819 Shottky SOD123 2 D4, D6 ZD Diode SOD323 2 C1, C8, C10, C19, C21 1µF/16V/X5R 0603 5 C12, C23 0.1µF 0604 2 C15, C26 470pF 0605 2 C5, C16 10pF 0606 2 C9, C20 3.9nF 0607 2 C14, C25 0.1µF 1206 2 C7, C18 1µF/25V/X7R 1207 2 C13, C24 0.47µF Metal 1210 2 C11, C22 470µF OD10P5.0 2 C6, C17 220µF/25V OD8.0P3.5 2 CN2, CN3 2 Pin Connector 2MM 2 CN1 6 Pin Connector 2MM 1 L2, L3 10µH/3.5A Toko D300\P200 2 R10, R11, R15, R16 10KΩ 0603 4 R13, R18 100 0604 2 R19, R20 1KΩ 0605 2 R7, R14 82KΩ 0606 2 R8, R9 100KΩ 0607 2 R12, R17 10 1206 2 Total EV0066 Rev 1.1 05/12/04 www.monolithicpower.com 48 3 EV0066 MP7720: Mini 20W Stereo Class D Single Ended Audio Amplifier Monolithic Power Systems EVALUATION BOARD Figure 3: THD+N vs. Output Power with RL = 4Ω, VCC=14V, 1KHz 20 10 5 2 1 % 0.5 0.2 0.1 0.05 0.02 0.01 60m 100m 200m 500m 1 2 5 10 W Figure 4: THD+N vs. Output Power with RL = 8Ω, VCC=14V, 1KHz 20 10 5 2 1 % 0.5 0.2 0.1 0.05 0.02 0.01 60m 100m EV0066 Rev 1.1 05/12/04 200m 500m W 1 2 www.monolithicpower.com 5 4 EV0066 Monolithic Power Systems MP7720: Mini 20W Stereo Class D Single Ended Audio Amplifier EVALUATION BOARD Figure 5: EV0066 Connection Diagram CN3 CN2 Pin 1=VCC Pin 2=GND Pin 3=EN Pin 4=IN1 Pin 5=IN2 Pin 6=GND OUT1 GND GND OUT2 CN1 Power Supply + IN1 - IN2 Enable Evaluation Board Operation Power Requirements 1. Power supply: 7.5V to 24V, 6A maximum 2. 0V to 1VRMS (max) audio signal source, ≤ 600Ω. 3. Speaker: 4Ω or 8Ω. Setup Condition for 24V Operation 1. Connect + and - speakers terminals to OUT and GND pins of CN2 and CN3 respectively. 2. Connect the + and 1 power supply terminals to Pin 1 and 2 of CN1 respectively. 3. Adjust the power supply to 7.5 ≤ VCC ≤ 24V, (do not turn on). 4. Connect the audio input signal source to the amplifier inputs (IN1, IN2). 5. Turn on the power supply to apply power to the board. 6. To enable the board apply a voltage, 2V ≤ VEN ≤ 6V, to the EN pin. To disable the board connect the EN pin to ground. EV0066 Rev 1.1 05/12/04 www.monolithicpower.com 5 EV0066 Monolithic Power Systems MP7720: Mini 20W Stereo Class D Single Ended Audio Amplifier EVALUATION BOARD Figure 6: Top Silk Layer Figure 7: Top Layer Figure 8: Bottom Layer Figure 9: Bottom Silkscreen Layer NOTICE: MPS believes the information in this document to be accurate and reliable. However, it is subject to change without notice. Please contact the factory for current specifications. No responsibility is assumed by MPS for its use or fit to any application, nor for infringement of patent or other rights of third parties. EV0066 Rev 1.1 05/12/04 © 2004 MPS, Inc. Monolithic Power Systems, Inc. 983 University Ave, Building A, Los Gatos, CA 95032 USA Tel: 408-357-6600 ♦ Fax: 408-357-6601 ♦ www.monolithicpower.com 6