IS31AP4991 CLASS-AB AUDIO AMPLIFIER DESCRIPTION RECOMMENDED EQUIPMENT The IS31AP4991 demo board is a fully assembled and tested PCB that uses the IS31AP4991 Class-AB power amplifier to drive an 8Ω or larger speaker in portable audio applications. The demo board accepts a single-ended input signal. The demo board provides a BTL output capable of delivering 1.2W into an 8Ω speaker at 5V. 5.0V, 2A power supply Audio source (i.e. MP3 player, Notebook PC, etc.) 8Ω speaker ABSOLUTE MAXIMUM RATINGS ≤ 5.5V power supply FEATURES Caution: Do not exceed the conditions listed above; otherwise the board will be damaged. PROCEDURE Supply voltage range from 2.7V to 5.5V Delivers 1.2W into an 8Ω speaker at 5V supply. (THD+N=10%). Ultra-low distortion (0.025%@0.5W, 1kHz) Available in MSOP-8 and SOP-8 package The IS31AP4991 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 an 8Ω (or larger) speaker across the OUT- terminal and OUT+ terminal. Or connect speaker to the connector (AUDIO OUT). 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 INPUT). Connect the audio source to the IN- terminal; or connect audio source to the connector (AUDIO INPUT). Turn on the power supply. Turn on the audio source. Figure 1: Photo of IS31AP4991 Evaluation Board Note: Only one IC type will be installed on PCB. ORDERING INFORMATION Part No. Temperature Range Package IS31AP4991-GRLS2-EB IS31AP4991-SLS2-EB -40°C ~ +85°C (Industrial) SOP-8, Lead-free MSOP-8, 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, 01/07/2015 1 IS31AP4991 CLASS-AB AUDIO AMPLIFIER DETAILED DESCRIPTION HIGH-PASS FILTER The IS31AP4991 demo board features the IS31AP4991 Class-AB power amplifier IC, designed to drive speaker impedance of 8Ω or larger. The input capacitor CI (C4) and input resistor RI (R1) form a high-pass filter with the corner frequency, fC, determined in Equation (2) and refer to IS31AP4991 data sheet for more detail. 1 CUSTOMIZING THE GAIN The IS31AP4991 demo board is shipped with a gain of 18.3dB and is set by resistors RI (R1) and RF (R2). Change resistors RI and RF to reconfigure the gain of the board and gain determined in Equation (1) Gain 2 RF V V RI f c 2R C I I (2) SHUTDOWN MODE Jumper (JP1) controls the shutdown pin of the IS31AP4991 IC. Connect the shunt across pin 1 and 2 of the jumper (JP1) to enter the shutdown mode of the board. (1) C5 VCC NC R2 C1 10uF C2 1uF 82k VCC DC INPUT C3 15nF 20k 4 1 3 2 VCC R1 Vin- Vout1 5 SPEAKER Standby Vin+ Bypass Vout2 8 7 C6 1uF GND C4 Audio IN 6 0.1uF U1 IS31AP4991_MSOP8 VCC R3 VCC C7 100k 1 JP1 1 5 CLOSE=SD Vout1 Vout2 2 Standby Vin+ Bypass 6 4 2 VCC 7 Vin- GND 3 8 0.1uF U2 IS31AP4991_SOP8 Figure 2: IS31AP4991 Application Circuit Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 01/07/2015 2 IS31AP4991 CLASS-AB AUDIO AMPLIFIER BILL OF MATERIALS Name Symbol Amplifier U1 Resistor Qty Supplier Part No. Class- AB power amplifier 1 ISSI IS31AP4991 R1 RES,20k,1/16W,±1%,SMD 1 Yageo RC0603FR-0720KL Resistor R2 RES,82k,1/16W,±1%,SMD 1 Yageo RC0603FR-0782KL Resistor R3 RES,100k,1/16W,±5%,SMD 1 Yageo RC0603JR-07100KL Capacitor C1 CAP,10µF,10V,±20%,SMD 1 Yageo CC0805KKX7R6BB106 Capacitor C2,C6 CAP, 1µF,50V,±10%,SMD 2 Yageo CC0603KKX7R9BB105 Capacitor C3,C7 CAP,0.1µF,50V,±10%,SMD 2 Yageo CC0603KKX7R9BB104 Capacitor C4 CAP,15nF,50V,±10%,SMD 1 Yageo CC0603KKX7R9BB153 Connector DC INPUT 2.5mm DC connector 1 Connector AUDIO OUT RCA –type connector 1 Connector AUDIO INPUT 3.5mm min connector 1 U2,C5 Description No installed Bill of materials, refers to Figure 2 above. Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 01/07/2015 3 IS31AP4991 CLASS-AB AUDIO AMPLIFIER 0 0 2 2 2 1 1 2 1 2 2 1 2 1 2 1 2 1 2 1 2 0 0 Figure 2: Board Component Placement Guide - Top Layer Figure 3: Board PCB Layout - Top Layer Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 01/07/2015 4 IS31AP4991 CLASS-AB AUDIO AMPLIFIER 0 0 2 2 2 1 1 2 1 2 2 1 2 1 2 1 2 1 2 1 2 0 0 Figure 4: Board Component Placement Guide - Bottom Layer Figure 5: 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, 01/07/2015 5