PAM8403H EVB User Guide PAM8403H-EV Board User Guide AE Department 1. Revision Information Date 2008/03/24 2012/07/31 Revision V1.0 V1.1 Description Initial Release Update PCB Comment 2. PAM8403H General Description The PAM8403H is a 3W, class-D audio amplifier. It offers low THD+N, allowing it to achieve high-quality sound reproduction. The new filter less architecture allows the device to drive the speaker directly, requiring no lowpass output filters, thus to save the system cost and PCB area. With the same numbers of external components，the efficiency of the PAM8403 is much better than that of class-AB cousins. It can extend the battery life, ideal for portable applications. 3. Key Features 3W Output at 10% THD with a 4Ω Load and 5V Thermal Shutdown Power Supply Few External Components to Save the Space Filter less, Low Quiescent Current and Low EMI Low THD+N Superior Low Noise Efficiency up to 90% Short Circuit Protection and Cost Pb-Free Package 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. PAM8403H EVB User Guide 4. EV Board Schematic VDD 3 2 1 MUTE VDD 3 2 1 10 12 5 PVDD OUT-L- PAM8403H INR OUT-R- SHDN OUT-R+ MUTE PGND VDD OUT-L+ PGND SD C9 C13 Q? 3 1 16 14 C14 FB3 SPL FB4 FB1 SPR FB2 C12 C11 15 C8 C10 VREF NC R5 8 INL 2 C4 7 PVDD R4 Input C15 4 6 R2 VDD C7 GND C5 C2 13 C1 C3 C6 11 R3 R1 9 VDD Figure 1 5. PAM8403 EB04AB EVB Description PAM8403 EB04AB is an evaluation board for the PAM8403H, a stereo class-D audio power amplifier. The board is targeted to be used in providing a simple and convenient evaluation environment for the PAM8403H. Requires parts, the standard RCA jacks for audio inputs, pin jacks for power supply and signal outputs etc. on the board make it easy to be evaluated. 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. PAM8403H EVB User Guide 6. EV Board View and Jack Description Top View SD Control Mute Control R-CH Output Audio Input L-CH Output EV Board Operational Sequence: Power Supply a. Connect SD to a high for normal operation b. Connect audio input from audio input jack c. Connect the loading (speaker or power resistor) to the output jack d. Power on: 2.5V to 5.5V DC 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. PAM8403H EVB User Guide 7. EV Board BOM List Item Value C5,C7 0.47µF C2,C9 1µF C1,C10 10µF C4 0.1µF C3 1µF C15 R1, R2 R3, R5 C6,C8 FB1,FB2, FB3,FB4 C11,C12, C13,C14 220µF 20K Type X5R/X7R, Ceramic/0603 X5R/X7R, Ceramic/0603 X5R/X7R, Ceramic/0805 X5R/X7R, Ceramic/0603 X5R/X7R, Ceramic/0603 Rating Description 25V Input coupling CAP 25V VDD coupling CAP, 25V VDD main coupling CAP, 25V VREF CAP 25V Decoupling CAP 10V 1% Decoupling CAP Input Resistor For EMI eliminate components form a FB-CAP filter Vender and port TMK107B7474KA-TR TMK107B7105KA-T TMK316AB7106KL-T UMK212B7104KG-T TMK107B7105KA-T NC NC 330Ω 0805 2A 1nF 0603 25V Wurth 724 792 037 TMK063B7102KP-F 8. External Components Selection Input Capacitors (C5, C7) (1) Form a high pass filter with Ri, and the cut off frequency is fc=1/2*Π*Ri*Ci (2) Have a tolerance of 10% or better for matching: any mismatch in capacitance causes an importance mismatch at the corner frequency and below (3) Low leakage current needed, 0.47µF, X5R/X7R ceramic recommend Input Resistors (R2, R4) (1) Limit the closed-loop gain (2) Form a high pass filter with Ci, and the cut off frequency is fc=1/2*Π*Ri*Ci (3) 1% tolerance needed for resistor matching to improve CMRR, PSRR Power Supply decoupling Caps (C2, C3, C9, C1, C10) (1) Low ESR for good THD, PSRR (2) 1uF ceramic for higher frequency transients, spikes, or digital hash on the line of PVDD/VDD (3) Additional 10µF 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 (4) Need place very closed to the IC VREF Capacitor (C4) (1) 1µF, X5R/X7R ceramic recommended (2) Place very closed to the device EMI Eliminate Filter (FB1, FB2, FB3 and FB4) (1) High impedance at high frequency and very low impedance at low frequency (2) The current rating is higher than 2A 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. PAM8403H EVB User Guide 9. 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 Others (1) The power supply capacitors (C2, C3, C9, C1, C10) need to place very close to the PAM8003’s pins. (2) Input capacitors (C5, C7) place closed to input pin as near as possible 10. PCB Layout Example Top 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. PAM8403H EVB User Guide 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.