PAM8304 EVB User Guide PAM8304-EV board User Guide AE Department 1. Revision Information Date Revision Description 2013/5/31 V1.0 Initial release Comment This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice. No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product. PAM8304 Document number: DSxxxxx Rev. 1 - 0 1 of 5 www.diodes.com March 2014 © Diodes Incorporated PAM8304 EVB User Guide 2. Key Features ◆ ◆ ◆ ◆ ◆ ◆ ◆ Supply Voltage from 2.8V to 6.0V 3.0W@10% THD Output with a 4Ω Load at 5V Supply High Efficiency up to 90% @1W with an 8Ω Speaker Shutdown Current <1mA Superior Low Noise without Input Short Circuit Protection Thermal Shutdown 3. EV Board Schematic VDD VDD J3 3 2 1 C5 SD C4 C3 J4 3 2 1 VDD C1 PVDD U1 R1 input - IN- R2 C2 FB 2 C6 OUT- SP K PAM8304 input + FB 1 IN+ SD GND SD GND OUT+ C7 Figure 1 4. PAM8304 CB81CA Description The PAM8304 is a mono filter-less class-D amplifier with high SNR and differential input that eliminate noise, The filter-less architecture requires no external output filter, fewer external components, less PCB area and lower system costs, and simplifies application design. The PAM8304 features short circuit protection and over temperature protection. Title Size B Date: File: 2 3 4 5 This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice. No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product. PAM8304 Document number: DSxxxxx Rev. 1 - 0 2 of 5 www.diodes.com March 2014 © Diodes Incorporated PAM8304 EVB User Guide 5. EV Board View Input Selection Jump (Differential or single-ended) Power In: 2.8V-6V Audio Input Speaker Output Enable control Selection Jump EV board operational sequence: a. b. c. d. e. f. Preset the power supply to between 2.8V and 6V. Turn off the power supply. Connect power supply to EV board power. Connect audio input from audio input jack. Connect the Speaker to the output jack Turn on the power supply This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice. No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product. PAM8304 Document number: DSxxxxx Rev. 1 - 0 3 of 5 www.diodes.com March 2014 © Diodes Incorporated PAM8304 EVB User Guide 6. EV Board BOM List Item Value C1,C2 0.1uF C3 1uF C4 1uF C5 10uF Type X5R/X7R, Ceramic/0603 X5R/X7R, Ceramic/0603 X5R/X7R, Ceramic/0603 X5R/X7R, Ceramic/0805 R1，R2 0603 IC1 PAM8304 Rating Description 10V Input coupling CAP 16V PVDD decoupling CAP 16V VDD decoupling CAP 10V PVDD decoupling CAP Vender and port Taiyo Yuden HMK107BJ104KA-T Taiyo Yuden EMK107B7105KA-T Taiyo Yuden EMK107B7105KA-T Taiyo Yuden LMK107BBJ106MALT Input coupling resistance PAM 7. External Components Selection Input Capacitors (C1,C2) (1). Form a high pass filter with Ri, and the cut off frequency is fc=1/2∏Ri*Ci (2). Have a tolerance of 10% or better for matching: any mismatch in capacitance causes an importance mismatch at the corner frequency. (3). Low leakage current needed, 0.1uF, X5R/X7R ceramic Power Supply decoupling Caps (C3, C4) (1). Low ESR for good THD, PSRR (2).C3,C4, Additional 1uF or greater for low frequency noise filtering and serves as a local storage capacitor for supplying current during large signal transients on the amplifier outputs (3).Need place very closed to the IC 8. PCB Layout Guidelines Grounding (1). Use plane grounding or separate grounds. (2). Do not use one line connecting power GND and analog GND (3). Output noise grounds must tie to system ground at the power in exclusively. (4). Signal currents for the inputs need to be returned to quite ground. This ground only ties to the signal components and the GND pin. Power Supply (1) VDD and PVDD need to be separated and tied together at the system power supply. (2) Recommend that the all the trace could be routed as short and thick as possible. (3) Any barricade placed in the trace could result in the bad performance of the amplifier. This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice. No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product. PAM8304 Document number: DSxxxxx Rev. 1 - 0 4 of 5 www.diodes.com March 2014 © Diodes Incorporated PAM8304 EVB User Guide Components Placement (1). The power supply capacitors (C3,C4) need to place very close to the PAM8304’s pins. (2). Input capacitors (C1,C2) place closed to input pin as near as possible 8. PCB Layout Example Top Layer Bottom Layer This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice. No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product. PAM8304 Document number: DSxxxxx Rev. 1 - 0 5 of 5 www.diodes.com March 2014 © Diodes Incorporated