IS31AP2036A HIGH EFFICIENCY, CLASS-K AUDIO POWER AMPLIFIER WITH INTEGRATED CHARGE PUMP CONVERTER DESCRIPTION RECOMMENDED EQUIPMENT The IS31AP2036A is a Class-K audio power amplifier 3.0~5.0V, 2A power supply with high efficiency and automatic gain control. It Audio source (i.e. MP3 player, Notebook PC, etc.) drives up to 2.0W (10% THD+N) into an 8 speaker 8 or 4 speakers from a 4.2V VCC supply. The IS31AP2036A integrates advanced high efficiency ABSOLUTE MAXIMUM RATINGS charge pump and whole power amplifier efficiency can be up to 75%. The output power will be maintained in 5.0V power supply 0.8W, 1.0W and 1.2W. Caution: Do not exceed the conditions listed above, otherwise the board will be damaged. The IS31AP2036A provides low cost, space saving solution for portable equipments which need audio output with higher power by boosting up supply voltage. PROCEDURE Its external components just include a few capacitors and resistors (no inductor). The IS31AP2036A demo board is fully assembled and The demo board has four modes to test the tested. Follow the steps below to verify board operation. functionality of the IS31AP2036A. Caution: Do not turn on the power supply until all connections are completed. FEATURES 1) Connect a 4 (or larger) speaker across the OUT- Operates from 3.0V to 5.0V terminal and OUT+ terminal or the RCA female Ultra low output noise floor connector (AUDIO OUT). Low EMI 2) Connect the ground terminal of the power supply -66dB (217Hz) high PSRR to the GND (TP1) and the positive terminal to the 0.05% low THD+N VCC (TP2). Or connect DC power to connector Pulse Count Control serial interface (DC IN) with a 2.5 mm Jack. Thermal and short-circuit protection 3) If the audio source is differential, remove jumper JP2, connect the negative of the audio source to Integrated Click-and-Pop suppression circuitry the IN- terminal, and connect the positive of the Available in FCQFN-16 (2mm 2mm) package audio source to IN+ terminal. 4) If the audio source is single-ended, connect the QUICK START audio source to the IN+ terminal, and close jumper JP2 or connect audio source to the audio mono connector (AUDIO IN) and close jumper JP2. 5) Turn on the audio source. 6) Turn on the power supply Figure 1: Photo of IS31AP2036A Evaluation Board Lumissil Microsystems www.lumissil.com 1 Rev.A, 10/26/2015 IS31AP2036A HIGH EFFICIENCY, CLASS-K AUDIO POWER AMPLIFIER WITH INTEGRATED CHARGE PUMP CONVERTER ORDERING INFORMATION Part No. Temperature Range Package IS31AP2036A-CLS2-EB -40C ~ +85C (Industrial) FCQFN-16, Lead-free Table 1: Ordering Information For pricing, delivery, and ordering information, please contact Lumissils analog marketing team at analog Lumissil.com or (408) 969-6600. EVALUATION BOARD OPERATION t and t are from 0.75 s to 10 s and 2 s is HI LO recommended. The IS31AP2036A demo board has an LPC922 MCU to read the status of the button (K1) which select Switch modes: it should pull down the SDB pin low between the different modes. The current operating over t (recommended 1ms) to shut down the IC and OFF mode is indicated by the illuminated LED on the left send pulse again to switch modes. side. The default mode is shutdown. GAIN SETTING MODE SETTINGS The IS31AP2036A demo board is shipped with a gain The operating mode is controlled by Pulse Count of 16.4V/V, and is set by resistors R (R (16.5k) Control (PCC wire) serial interface. The interface IN Internal + R (R or R )).Change resistors R and R to records rising edges of the SDB pin and decodes them External 7 8 7 8 reconfigure the gain of the board .Gain determined in into 4 operating mode as below. Equation (1) Mode 1 320k V SDB Gain (1) R R V Internal External Mode 2 SDB HIGH-PASS FILTER Mode 3 SDB The evaluation boards high-pass filter consists of the input capacitors C (C or C ) and R (R (16.5k) IN 7 8 IN Internal Mode 4 + R (R or R )). The filters corner frequency, f , is external 7 8 C SDB determined by Equation (2). tHI tLO tOFF 1 (2) f Shutdown c 2R C IN IN SDB SHUTDOWN MODE SDB Status Function Jumper (JP1) controls the shutdown pin of the 1 Pulse Mode1 (NCN power 1.2W) R = 8 L IS31AP2036A IC. Connect the shunt across pin 1 and 2 Pulse Mode2 (NCN power 1.0W) R = 8 2 of the jumper (JP1) to enter the shutdown mode of L the board. 3 Pulse Mode3 (NCN power 0.8W) R = 8 L 4 Pulse Mode4 (NCN OFF) Pull low (1ms) Shutdown Lumissil Microsystems www.lumissil.com 2 Rev.A, 10/26/2015