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| EV0066 Monolithic Power Systems General Description The EV0066 is a 20W stereo evaluation board featuring MPS' MP7720 Class D Single Ended Audio Amplifier. The EV0066 can deliver 20W into a 4 load with a 24V input supply. 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: 180m power MOSFETs Start up / shut down pop elimination Short circuit protection circuits MP7720: Mini 20W Stereo Class D Single Ended Audio Amplifier EVALUATION BOARD Absolute Maximum Ratings Supply Voltage VDD Signal Input Voltage Enable Voltage 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 <600 0V to 5V 4 to 8 Performance Maximum Output Power (10% THD, 4) 20W Maximum Output Power (10% THD, 8) 10W THD (1kHz, 1W) 0.05% Power Efficiency (POUT=20W, 4) 90% The MP7720 utilizes a single ended output structure capable of delivering 20W into 4 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%. Features 20W Output at 24V Input Into a 4 Load 0.05% THD+N @ 2W, 1KHz Into 4 Load 0.05% THD+N @ 2W, 1KHz Into 8 Load 90% Efficiency at 20W Integrated Start-Up and Shut-Down Pop Elimination Circuit Thermal Protection Integrated 180m Power Switches Mute / Standby Mode (Sleep) Ordering Information Board Number EV0066 MPS IC Number MP7720DS EV0066 Evaluation Board 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 Table 1: EV0066 Bill of Materials Component U2, U3 D3, D5 D4, D6 C1, C8, C10, C19, C21 C12, C23 C15, C26 C5, C16 C9, C20 C14, C25 C7, C18 C13, C24 C11, C22 C6, C17 CN2, CN3 CN1 L2, L3 R10, R11, R15, R16 R13, R18 R19, R20 R7, R14 R8, R9 R12, R17 Description MP7720DS 1N5819 Shottky ZD Diode 1F/16V/X5R 0.1F 470pF 10pF 3.9nF 0.1F 1F/25V/X7R 0.47F Metal 470F 220F/25V 2 Pin Connector 6 Pin Connector 10H/3.5A Toko 10K 100 1K 82K 100K 10 Package SOIC8 SOD123 SOD323 0603 0604 0605 0606 0607 1206 1207 1210 OD10P5.0 OD8.0P3.5 2MM 2MM D300\P200 0603 0604 0605 0606 0607 1206 Total Qty 2 2 2 5 2 2 2 2 2 2 2 2 2 2 1 2 4 2 2 2 2 2 48 MP7720: Mini 20W Stereo Class D Single Ended Audio Amplifier EVALUATION BOARD EV0066 Rev 1.1 05/12/04 www.monolithicpower.com 3 EV0066 Monolithic Power Systems MP7720: Mini 20W Stereo Class D Single Ended Audio Amplifier EVALUATION BOARD Figure 3: THD+N vs. Output Power with RL = 4, VCC=14V, 1KHz 20 10 5 2 1 % 0.5 0.2 0.1 0.05 0.02 0.01 60m 100m 200m 500m W 1 2 5 10 Figure 4: THD+N vs. Output Power with RL = 8, VCC=14V, 1KHz 20 10 5 2 1 0.5 % 0.2 0.1 0.05 0.02 0.01 60m 100m 200m 500m W 1 2 5 EV0066 Rev 1.1 05/12/04 www.monolithicpower.com 4 EV0066 Monolithic Power Systems Figure 5: EV0066 Connection Diagram MP7720: Mini 20W Stereo Class D Single Ended Audio Amplifier EVALUATION BOARD CN2 CN3 OUT1 GND GND OUT2 CN1 Power Supply + Enable Pin 1=VCC Pin 2=GND Pin 3=EN Pin 4=IN1 Pin 5=IN2 Pin 6=GND IN1 IN2 Evaluation Board Operation Power Requirements 1. Power supply: 7.5V to 24V, 6A maximum 2. 0V to 1VRMS (max) audio signal source, 600. 3. Speaker: 4 or 8. 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 Figure 6: Top Silk Layer MP7720: Mini 20W Stereo Class D Single Ended Audio Amplifier EVALUATION BOARD 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 (c) 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 |
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