IS31AP4990D CLASS-AB AUDIO AMPLIFIER DESCRIPTION RECOMMENDED EQUIPMENT The IS31AP4990D demo board is a fully assembled and tested PCB that uses the IS31AP4990D Class-AB power amplifier to drive an 8Ω or larger speaker in audio applications such as mobile phones. 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=1%). Ultra-low consumption in shutdown mode (1μA) Available in UTQFN-9 package Follow the steps listed below to verify board operation. Caution: Do not turn on the power supply until all connections are completed. 1) QUICK START 2) 3) 4) 5) 6) Connect 8Ω (or larger) speaker across the OUTterminal 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). If audio source is single-ended, please refer to the application circuit on Page 2, remove jumper JP2, connect the audio source to the IN- terminal; or connect audio source to the audio connector (AUDIO IN) and remove jumper JP2. If the audio source is differential, please refer to the application circuit on Page3, remove jumper JP2, connect the negative of the audio source to the IN- terminal, and connect the positive of the audio source to IN+ terminal. Turn on the power supply. Turn on the audio source. Figure 1: Photo of IS31AP4990D Evaluation Board ORDERING INFORMATION Part No. Temperature Range Package IS31AP4990D-UTLS2-EB -40°C ~ +85°C (Industrial) UTQFN-9, 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 IS31AP4990D CLASS-AB AUDIO AMPLIFIER DETAILED DESCRIPTION HIGH-PASS FILTER The IS31AP4990D demo board features the IS31AP4990D Class-AB power amplifier IC, designed to drive speaker impedance of 8Ω or larger. The input capacitor CI (C1) and input resistor RI (R2) form a high-pass filter with the corner frequency, fc, determined in Equation (2) and refer to IS31AP4990D datasheet for more detail. 1 CUSTOMIZING THE GAIN The IS31AP4990D demo board is shipped with a gain of 18.3dB and is set by resistors RI (R2) and RF (R4). Change resistors RI and RF to reconfigure the gain of the board and gain determined in Equation (1) Gain 2 RF V RI V f c 2R C I I (2) SHUTDOWN MODE Jumper (JP1) controls the shutdown pin of the IS31AP4990D IC. Connect the shunt across pin 1 and 2 of the jumper (JP1) to enter the shutdown mode of the board. (1) C6 NC R4 VCC C3 10uF C5 0.1uF B3 82K IN+ 15nF R2 20K A1 A3 C1 NC R1 NC C4 VIN- U1 VCC IN- C2 VOUT1 A2 VIN+ R3 0R C1 JP2 Bypass Speaker C3 R5 Standby GND 1uF VOUT2 C2 100K JP1 B1,B2 VCC IS31AP4990D Figure 2: IS31AP4990D Application Circuit (Single-ended ) Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 01/07/2015 2 IS31AP4990D CLASS-AB AUDIO AMPLIFIER BILL OF MATERIALS Name Symbol Amplifier U1 Resistor Description Qty Supplier Part No. Class- AB power amplifier 1 ISSI R2 RES,20k,1/16W,±1%,SMD 1 Yageo RC0603FR-0720KL Resistor R3 RES,0R,1/16W,±5%,SMD 1 Yageo RC0603JR-0700RL Resistor R4 RES,82k,1/16W,±1%,SMD 1 Yageo RC0603FR-0782KL Resistor R5 RES,100k,1/16W,±5%,SMD 1 Yageo RC0603JR-07100KL Capacitor C3 CAP,10µF,16V,±20%,SMD 1 Yageo CC0805KKX7R6BB106 Capacitor C4 CAP, 1µF,50V,±10%,SMD 1 Yageo CC0603KKX7R9BB105 Capacitor C5 CAP,0.1µF,50V,±10%,SMD 1 Yageo CC0603KKX7R9BB104 Connector DC IN 2.5mm DC connector 1 Connector AUDIO OUT RCA –type connector 1 Connector AUDIO IN 3.5mm min connector 1 C1,C6,R1 Not installed 3 IS31AP4990D Bill of materials, refer to Figure 2 above. Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 01/07/2015 3 IS31AP4990D CLASS-AB AUDIO AMPLIFIER 0 0 2 2 1 2 1 2 1 2 2 1 2 1 2 2 1 1 2 0 1 2 1 2 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 IS31AP4990D CLASS-AB AUDIO AMPLIFIER 0 0 2 2 1 2 1 2 1 2 2 1 2 1 2 2 1 1 2 0 1 2 1 2 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