IS31AP4088D CLASS-AB AUDIO AMPLIFIER DESCRIPTION RECOMMENDED EQUIPMENT The IS31AP4088D demo board is a fully assembled and tested PCB that uses the IS31AP4088D Class-AB a dual bridge-connected audio power amplifier. Designed to drive speaker impedance of 4Ω or larger. The demo board provides dual BTL output, capable of delivering 2.6W into a 4Ω speaker at 5V. ABSOLUTE MAXIMUM RATINGS FEATURES Supply voltage range from 2.7V to 5.5V Delivers 2.6W into a 4Ω speaker at 5V supply (THD+N=10%) Delivers 1.6W into an 8Ω speaker at 5V supply (THD+N=10%) Available in QFN-16 (4mm × 4mm) package 5.0V, 2A power supply Audio source (i.e. MP3 player, Notebook PC, etc.) 8Ω or 4Ω speaker ≤ 5.5V power supply Caution: Do not exceed the conditions listed above; otherwise the board will be damaged. PROCEDURE The IS31AP4088D demo board is fully assembled and tested. Follow the steps listed below to verify board operation. Caution: Do not turn on the power supply until all connections are completed. QUICK START 1) 2) 3) 4) 5) Connect 4Ω (or larger) speakers across the (OUTA+, OUTA-) terminal and (OUTB+, OUTB-) terminal. Or connect speakers to the connector (OUTA, OUTB). Connect the ground terminal of the power supply to the GND and the positive terminal to the VCC. Or connect DC power to connector (DC CON). Connect the audio sources to the INA terminal (left channel) and INB terminal (right channel); or connect audio sources to the connector (AUDIO IN). Turn on the power supply. Turn on the audio sources. Figure 1: Photo of IS31AP4088D Evaluation Board ORDERING INFORMATION Part No. Temperature Range Package IS31AP4088D-QFLS2-EB -40°C to +85°C (Industrial) QFN-16, Lead-free Table 1: Ordering Information For pricing, delivery, and ordering information, please contacts ISSI’s analog marketing team at [email protected] or (408) 969-6600. Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 01/15/2015 1 IS31AP4088D CLASS-AB AUDIO AMPLIFIER DETAILED DESCRIPTION HIGH-PASS FILTER The IS31AP4088D demo board features the IS31AP4088D Class-AB power amplifier IC, designed to drive speaker impedance of 4Ω or larger. The input capacitors CI (C5, C6) and input resistors RI (R1, R2) form a high-pass filter with the corner frequency, fC determined in Equation (2). 1 f c 2R C I I CUSTOMIZING THE GAIN The IS31AP4088D demo board is shipped with a gain of 18.3dB and is set by resistors RI (R1, R2) and RF (R3, R4). Change resistors RI and RF to reconfigure the gain of the board .Gain determined in Equation (1) and refer to IS31AP4088D data sheet for more detail. Gain 2 RF V RI V (2) SHUTDOWN MODE Jumper (J1) controls the shutdown pin of the IS31AP4088D IC. Connect the shunt across pin 1 and 2 of the jumper (J1) to enter the shutdown mode of the board. (1) R3 82K J2 DC CON VCC VCC C1 10uF VCC R5 C3 GND 0.1uF J8 AUDIO IN 15nF 4 INA 20K SDB R1 J1 CLOSE=SD 15 11 2 0.1uF VDD VDD C5 INA 100K C2 OUTA- OUTA+ C4 9 3 OUTA- 1 OUTA+ J3 OUTA U1 BYPASS 1uF OUTB+ C6 8 20K INB OUTB- 10 OUTB- J4 OUTB 5 6 7 13 14 16 15nF OUTB+ R2 GND GND GND GND GND GND INB 12 IS31AP4088D R4 82K Figure 2: IS31AP4088D Application Schematic Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 01/15/2015 2 IS31AP4088D CLASS-AB AUDIO AMPLIFIER BILL OF MATERIALS Name Symbol Amplifier U1 Resistor Description Qty Supplier Part No. Class-AB power amplifier 1 ISSI IS31AP4088D R1,R2 RES,20k,1/16W,±1%,SMD 2 Yageo RC0603FR-0720KL Resistor R3,R4 RES,82k,1/16W,±1%,SMD 2 Yageo RC0603FR-0782KL Resistor R5 RES,100k,1/16W,±5%,SMD 1 Yageo RC0603JR-07100KL Capacitor C1 CAP,10µF,10V,±10%,SMD 1 Yageo CC0805KRX7R6BB106 Capacitor C2,C3 CAP, 0.1µF,50V,±10%,SMD 2 Yageo CC0603KRX7R9BB104 Capacitor C4 CAP,1µF,50V,±10%,SMD 1 Yageo CC0603KRX7R9BB105 Capacitor C5,C6 CAP,15nF,50V,±10%,SMD 2 Yageo CC0603KRX7R9BB153 Connector DC CON 2.5mm DC connector 1 Connector OUTA,OUTB RCA -type plugs 2 Connector AUDIO IN 3.5mm min plug 1 Table 2: Bill of Materials, refer to Figure 2 above. Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 01/15/2015 3 IS31AP4088D CLASS-AB AUDIO AMPLIFIER 0 2 2 1 1 0 2 1 2 1 2 1 2 1 2 3 1 1 1 2 2 1 2 1 2 1 1 2 2 0 0 Figure 3: Board Component Placement Guide - Top Layer Figure 4: Board PCB Layout - Top Layer Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 01/15/2015 4 IS31AP4088D CLASS-AB AUDIO AMPLIFIER 0 2 2 1 1 0 2 1 2 1 2 1 2 1 2 3 1 1 1 2 2 1 2 1 2 1 1 2 2 0 0 Figure 5: Board Component Placement Guide - Bottom Layer Figure 6: Board PCB Layout - Bottom Layer Copyright © 2015 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at any time without notice. ISSI assumes no liability arising out of the application or use of any information, products or services described herein. Customers are advised to obtain the latest version of this device specification before relying on any published information and before placing orders for products. Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless Integrated Silicon Solution, Inc. receives written assurance to its satisfaction, that: a.) the risk of injury or damage has been minimized; b.) the user assume all such risks; and c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 01/15/2015 5