IS31AP4991A 1.1W AUDIO POWER AMPLIFIER WITH ACTIVE-LOW SHUTDOWN MODE DESCRIPTION RECOMMENDED EQUIPMENT The IS31AP4991A has been designed for demanding 5.0V, 1A power supply audio applications such as mobile phones and permits Audio source (i.e. MP3 player, Notebook PC, etc.) the reduction of the number of external components. It 8 speakers is capable of delivering 1.1W of continuous RMS output power into an 8 load 5V. ABSOLUTE MAXIMUM RATINGS An externally-controlled standby mode reduces the supply current to much less than 1 A. It also includes 5.5V power supply internal thermal shutdown protection. The unity-gain stable amplifier can be configured by external gain Caution: Do not exceed the conditions listed above, otherwise the board will be damaged. setting resistors. FEATURES PROCEDURE Operating from V = 2.7V ~ 5.5V CC The IS31AP4991A evaluation board is fully assembled 1.1W output power V = 5V, THD+N= 1%, CC and tested. Follow the steps listed below to verify f = 1kHz, with 8 load board operation. Ultra-low consumption in standby mode (much Caution: Do not turn on the power supply until all connections less than 1 A) are completed. 56dB PSRR 217Hz in grounded mode 1) Connect an 8 (or larger) speaker across the Near-zero click-and-pop OUT- terminal and OUT+ terminal. Or connect Ultra-low distortion (0.074% 0.5W, 1kHz) speaker to the connector (SPK). SOP-8 and MSOP-8 package 2) Connect the ground terminal of the power supply to the GND and the positive terminal to the VCC. QUICK START Or connect DC power to the connector (DC IN). 3) If the audio source is differential, 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, C3 and R1 should disconnect, and R3 should be 0 . Connect the audio source to the IN- terminal, or connect audio source to the connector (AUDIO IN). 5) Turn on the power supply. 6) Turn on the audio source. Figure 1: Photo of IS31AP4991A Evaluation Board (MSOP-8) Figure 2: Photo of IS31AP4991A Evaluation Board (SOP-8) Lumissil Microsystems www.lumissil.com 1 Rev. B, 04/01/2015 IS31AP4991A 1.1W AUDIO POWER AMPLIFIER WITH ACTIVE-LOW SHUTDOWN MODE ORDERING INFORMATION Part No. Temperature Range Package IS31AP4991A-GRLS2-EB SOP-8, Lead-free -40C ~ +85C (Industrial) IS31AP4991A-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. EVALUATION BOARD OPERATION HIGH-PASS FILTER The IS31AP4991A demo board features the The input capacitor C (C , C ) and input resistor R (R , I 3 4 I 1 IS31AP4991A Class-AB power amplifier IC, designed R ) form a high-pass filter with the corner frequency, f , 2 C to drive speaker impedance of 8 or larger. determined in Equation (2) and refer to IS31AP4991A datasheet for more detail. 1 CUSTOMIZING THE GAIN f (2) c 2R C I I The IS31AP4991A demo board is shipped with a gain of 6dB and is set by resistors R (R , R ) and R (R , I 1 2 F 3 R ). Change resistors R and R to reconfigure the gain 4 I F SHUTDOWN MODE of the board and gain determined in Equation (1): Jumper (JP1) controls the shutdown pin of the 2 R V F Gain (1) IS31AP4991A IC. Connect the jumper (JP1) to enter R V I the shutdown mode of the board. C6 NC R4 TP1 20k CON1 VCC DC IN C1 VCC C2 10uF 1uF U1 TP2 OUT- R2 20k IN- C4 100nF INN 4 5 TP4 IN- OUT- TP6 IN+ INP 3 TP3 IN+ C3 100nF 20k R1 CON3 C5 R3 SPK 20k C7 NC Bypass 2 8 BYPASS OUT+ TP5 1 OUT+ SDB CON2 0.47uF SDB AUDIO IN IN- R5 IS31AP4991A-GRLS2 VCC IS31AP4991A-SLS2 100k JP1 CLOSE=SD Figure 3: IS31AP4991A Application Schematic Lumissil Microsystems www.lumissil.com 2 Rev. B, 04/01/2015 6 7 VCC GND