Smartphone Audio System Solution

Awinic Smart PA solutions can deliver output power from 3W to 6W depending on the specific device and speaker configuration. The AW87318 delivers up to 5W into a 4-ohm speaker with battery voltage of 3.6V. The integrated boost converter steps up the battery voltage to 8.5V, enabling high voltage swing for maximum power delivery. Actual output power depends on several factors: Speaker impedance - 4-ohm speakers receive more power than 8-ohm speakers. Battery voltage - the boost converter maintains consistent output as battery discharges. Speaker power handling - the IV sensing limits power to safe levels for the specific speaker. Thermal conditions - maximum power may be limited at high ambient temperatures. For typical smartphone micro speakers rated at 0.7-1W continuous, the Smart PA can deliver 3-5W peak power for short durations, providing loud, clear sound for ringtones and media playback.

Expect 3-5W output power with typical smartphone speakers. Contact our FAE for power calculations.

IV sensing protects speakers by continuously monitoring the electrical characteristics of the speaker voice coil. The technology works by: Measuring both current (I) and voltage (V) at the speaker terminals in real-time. Calculating the speaker's electrical impedance, which changes with temperature. Detecting when the voice coil approaches dangerous temperatures based on impedance changes. Detecting when the diaphragm approaches mechanical limits based on signal characteristics. When limits are approached, the amplifier automatically reduces gain or applies compression to protect the speaker while maintaining audio output. This real-time protection is superior to fixed thresholds because it adapts to the specific speaker and operating conditions. IV sensing also enables maximum performance - the amplifier can operate closer to limits because it has accurate feedback about speaker condition. The protection is fast-acting, responding in milliseconds to prevent damage.

IV sensing provides superior protection by monitoring speaker temperature and excursion in real-time.

Acoustic tuning optimizes the sound quality for your specific speaker and enclosure. The tuning process involves: Speaker characterization - measuring the speaker's Thiele-Small parameters and frequency response. Enclosure optimization - designing the acoustic cavity and any ports for extended bass response. DSP configuration - adjusting the built-in DSP features for your specific acoustic system. Key DSP parameters include: Equalization filters to flatten frequency response. Dynamic range compression to maintain consistent loudness. Psychoacoustic bass boost to enhance perceived low frequencies. Excursion limiting to prevent mechanical damage. Awinic provides acoustic tuning services and tools to optimize these parameters. The tuning typically requires: Acoustic measurements in an anechoic chamber or with calibrated microphones. Iterative adjustment of DSP parameters based on measurements. Subjective listening tests to validate sound quality. The result is optimized sound quality tailored to your specific speaker and enclosure design.

Acoustic tuning optimizes DSP settings for your specific speaker. Awinic provides tuning services and tools.

Smart PA can be used with a wide range of speakers, but optimal performance requires appropriate speaker selection. Ideal speakers for Smart PA have: Impedance of 4-8 ohms for best power transfer. Power handling appropriate for the target SPL - typically 0.5-1W continuous for smartphone micro speakers. Good linearity to minimize distortion at high excursion. Robust construction to withstand high peak power. The IV sensing technology adapts to different speaker characteristics, providing appropriate protection for various speaker types. However, very small speakers (<10mm) may not benefit fully from high power capability. Very large speakers may exceed the amplifier's current capability. Awinic can provide speaker characterization services to evaluate compatibility and optimize protection settings. For best results, work with speaker vendors who understand Smart PA technology and can recommend appropriate units.

Smart PA works with 4-8 ohm speakers. Contact our FAE for speaker selection guidance.

Smart PA and standard Class-D amplifiers have several key differences: Output power - Smart PA includes integrated boost converter enabling 3-5W output, while standard Class-D typically provides 1-2W. Protection - Smart PA includes IV sensing for real-time speaker protection, standard Class-D has basic over-current protection. DSP features - Smart PA includes integrated DSP for audio enhancement, standard Class-D is analog only. Efficiency - both are high efficiency (>90%), but Smart PA maintains efficiency across battery voltage range thanks to adaptive boost. Cost - Smart PA has higher cost due to additional features, standard Class-D is more cost-effective for basic applications. Use Smart PA when: Premium audio quality is required. Maximum output power is needed. Speaker protection is critical. Use standard Class-D when: Cost is primary concern. Basic audio is sufficient. Power requirements are modest.

Use Smart PA for premium audio, standard Class-D for cost-sensitive applications. Contact our FAE for selection guidance.

Implementing stereo audio with Awinic Smart PA involves using two Smart PA devices, one for each channel. The implementation steps include: Hardware design - place two Smart PA ICs on the PCB, one for left channel and one for right. Each Smart PA drives its own speaker. Power supply - ensure adequate power delivery for both amplifiers operating simultaneously. Control interface - both Smart PAs can share the same I2C bus with different device addresses. Software control - implement stereo audio processing in the application processor. Send audio data to both channels with appropriate left/right separation. Synchronization - ensure both channels start simultaneously to maintain stereo imaging. Balance control - implement volume balance adjustment through I2C registers if needed. Acoustic considerations - the two speakers may have different acoustic environments (bottom vs top of phone), requiring individual DSP tuning. Awinic provides reference designs for stereo configurations and can assist with acoustic optimization for each channel.

Use two Smart PAs for stereo audio. Contact our FAE for stereo reference designs.