IS31AP2005 CLASS-D AUDIO AMPLIFIER DESCRIPTION RECOMMENDED EQUIPMENT The IS31AP2005 demo board is a fully assembled and 5.0V, 2A power supply tested PCB that uses the IS31AP2005 Class-D power Audio source (i.e. MP3 player, Notebook PC, etc.) amplifier to drive an 8 or 4 speaker in portable 8 or 4 speaker audio applications. Designed to operate from a 2.7V to 5.5V DC power supply, the demo board accepts a single-ended or differential input signal. The demo ABSOLUTE MAXIMUM RATINGS board provides a BTL output capable of delivering 5.5V power supply 2.6W into a 4 speaker at 5V. Caution: Do not exceed the conditions listed above otherwise the board will be damaged. FEATURES Supply voltage range from 2.7V to 5.5V PROCEDURE Delivers 2.6W into a 4 speaker at 5V supply The IS31AP2005 demo board is fully assembled and (THD+N=10%) tested. Follow the steps listed below to verify board Delivers 1.8W into an 8 speaker at 5V supply operation. (THD+N=10%) Caution: Do not turn on the power supply until all connections Available in MSOP-8 and DFN-8 packages are completed. 1) Connect a 4 (or larger) speaker across the OUT- QUICK START terminal and OUT+ terminal. 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 IN). 3) If the audio source is differential, remove jumper JP1, connect the negative of the audio source to the IN- terminal, and connect the positive of the audio source to IN+ terminal. 4) If the audio source is single-ended, connect the audio source to the IN+ terminal, and close jumper JP1 or connect audio source to the audio connector (AUDIO IN) and close jumper JP1. 5) Turn on the power supply. 6) Turn on the audio source. Figure 1: Photo of IS31AP2005 Evaluation Board ORDERING INFORMATION Part No. Temperature Range Package IS31AP2005-SLS2-EB -40C ~ +85C (Industrial) 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, 01/09/2015 IS31AP2005 CLASS-D AUDIO AMPLIFIER DETAILED DESCRIPTION HIGH-PASS FILTER The IS31AP2005 demo board features the The input capacitors C (C , C ) and input resistors R I 3 4 I IS31AP2005 Class-D power amplifier IC, designed to (R, R) form a high-pass filter with the corner 1 2 drive speaker impedance of 4 or larger. frequency, f determined in Equation (2). C 1 f (2) c CUSTOMIZING THE GAIN 2R C I I The IS31AP2005 demo board is shipped with a gain of 18.4dB and is set by resistors R (R , R ). Change I 1 2 SHUTDOWN MODE resistors R and R to reconfigure the gain of the 1 2 board .Gain determined in Equation (1) and refer to Jumper (JP2) controls the shutdown pin of the IS31AP2005 data sheet for more detail. IS31AP2005 IC. Connect the shunt across pin 1 and 2 of the jumper (JP2) to enter the shutdown mode of the 2 150k V Gain (1) board. R V I VCC C1 10uF C2 0.1uF U1 10nF R1 36K 3 5 IN+ IN+ OUT+ C3 R2 36K 10nF 4 IN- IN- C4 VCC R3 100K SPEAKER 1 8 SDB OUT- JP1 Close=SE JP2 CLOSE=SD IS31AP2005 Figure 2: IS31AP2005 Application Circuit Lumissil Microsystems www.lumissil.com 2 Rev. A, 01/09/2015 7 GND 6 VDD 2 NC