IS32AP2123 24W MONO AUTOMOTIVE CLASS-D AUDIO AMPLIFIER WITH LOAD DUMP AND I2C DIAGNOSTICS October 2020 GENERAL DESCRIPTION FEATURES The IS32AP2123 is a Class-D audio amplifier for 4.5V to 24V operating range driving a mono speaker in BTL (Bridge-Tied-Load) Mono BTL digital power amplifier configuration. It is capable of delivering 20W into 4 Differential analog input speaker at less than 1% THD+N from a 14.4V power 24W output power at 10% THD+N into 4 supply. 70dB power supply rejection ratio (PSRR) It is a mono Class-D audio amplifier designed for Up to 85% efficiency into 4 automotive applications, such as emergency call Support spread spectrum to optimize EMI (eCall), telematics, and instrument cluster, and I2C Interface infotainment applications. With a wide operating - Query and set up critical device parameters voltage range of 4.5V to 24V makes it ideal for Automatic load diagnostic functions during start/stop or backup battery operation. power up and after fault events: The IS32AP2123 comes with onboard load - Open and shorted output load diagnostic hardware accessible via a standard I2C - Output-to-power and -ground shorts port. The internal diagnostics evaluate the output Support AM avoidance (400 and 500kHz impedance to check for shorts across the outputs, to modulation frequency) the battery, or to ground. The I2C interface allows the AGC function with adjustable power limiter system to reads of diagnostic and protection device Protection and monitoring functions: parameters. - Short-circuit (to ground, VCC or The integrated 40V load-dump protection reduces output-to-output) protection external voltage clamp cost and size, for reliable - 40V load dump protection automotive audio systems. The highly efficient (85%) - Output DC level detection while music is IS32AP2123 comes in a thermally enhanced playing eTSSOP-16 package requiring no heatsink for typical - Over temperature protection operation. - Over and under voltage protection - Dynamic temperature control to avoid thermal APPLICATIONS run away Thermally enhanced eTSSOP-16 package Automotive emergency call (eCall) Designed for automotive EMC requirements Telemetric systems AEC-Q100 Qualified Instrument cluster systems -40C to +125C ambient operating temperature Infotainment audio Lumissil Microsystems www.lumissil.com 1 Rev.A, 07/07/2020 IS32AP2123 TYPICAL APPLICATION CIRCUIT V CC 9,16 2 VCC VDD 1 330 F AGND 1 F 1 F 0.1 F 3.3V~5.0V 14 0.22 F BS+ 6 47k 4.7k 4.7k SDA 13 7 OUT+ SCL Micro IS32AP2123 8 Controller FAULTB 3 SDB 12 OUT- 11 BS- 0.22 F CIN+ 4 1 F IN+ Analog Audio 10,15 5 PGND Input IN- CIN- 1 F Figure 1 Typical Application Circuit Lumissil Microsystems www.lumissil.com 2 Rev.A, 07/07/2020