IS31AP4991 CLASS-AB AUDIO AMPLIFIER DESCRIPTION RECOMMENDED EQUIPMENT The IS31AP4991 demo board is a fully assembled and 5.0V, 2A power supply tested PCB that uses the IS31AP4991 Class-AB Audio source (i.e. MP3 player, Notebook PC, etc.) power amplifier to drive an 8 or larger speaker in 8 speaker 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 8 ABSOLUTE MAXIMUM RATINGS speaker at 5V. 5.5V power supply Caution: Do not exceed the conditions listed above otherwise the board will be damaged. FEATURES Supply voltage range from 2.7V to 5.5V Delivers 1.2W into an 8 speaker at 5V supply. PROCEDURE (THD+N=10%). The IS31AP4991 demo board is fully assembled and Ultra-low distortion (0.025% 0.5W, 1kHz) tested. Follow the steps listed below to verify board Available in MSOP-8 and SOP-8 package operation. Caution: Do not turn on the power supply until all connections are completed. QUICK START 1) Connect an 8 (or larger) speaker across the OUT- terminal and OUT+ terminal. Or connect speaker to the connector (AUDIO OUT). 2) 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). 3) Connect the audio source to the IN- terminal or connect audio source to the connector (AUDIO INPUT). 4) Turn on the power supply. 5) 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 SOP-8, Lead-free -40C ~ +85C (Industrial) IS31AP4991-SLS2-EB MSOP-8, Lead-free Table 1: Ordering Information For pricing, delivery, and ordering information, please contacts Lumissils analog marketing team at analog Lumissil.com or (408) 969-6600. Lumissil Microsystems www.lumissil.com 1 Rev. A, 01/07/2015 IS31AP4991 CLASS-AB AUDIO AMPLIFIER DETAILED DESCRIPTION HIGH-PASS FILTER The IS31AP4991 demo board features the The input capacitor C (C ) and input resistor R (R ) I 4 I 1 IS31AP4991 Class-AB power amplifier IC, designed to form a high-pass filter with the corner frequency, f , C drive speaker impedance of 8 or larger. determined in Equation (2) and refer to IS31AP4991 data sheet for more detail. 1 CUSTOMIZING THE GAIN f (2) c 2R C I I The IS31AP4991 demo board is shipped with a gain of 18.3dB and is set by resistors R (R ) and R (R ). I 1 F 2 Change resistors R and R to reconfigure the gain of I F the board and gain determined in Equation (1) SHUTDOWN MODE Jumper (JP1) controls the shutdown pin of the 2 R V F Gain (1) IS31AP4991 IC. Connect the shunt across pin 1 and 2 R V I of the jumper (JP1) to enter the shutdown mode of the board. C5 VCC NC R2 C1 C2 82k 10uF 1uF VCC C3 DC INPUT 0.1uF U1 C4 R1 4 5 Audio IN Vin- Vout1 20k 15nF 1 SPEAKER Standby 3 Vin+ 2 8 Bypass Vout2 C6 1uF IS31AP4991 MSOP8 VCC R3 VCC C7 100k 0.1uF U2 3 2 Vin- Vout1 7 Standby 1 1 Vin+ 5 6 Bypass Vout2 JP1 CLOSE=SD 2 IS31AP4991 SOP8 Figure 2: IS31AP4991 Application Circuit Lumissil Microsystems www.lumissil.com 2 Rev. A, 01/07/2015 4 8 7 6 GND VCC GND VCC