uring the TPA3111D1-Q1 high efficiency mono Class D audio amplifier and the TPS43330-Q1, single-boost, dual synchronous buck controller with ultra low quiescent current, TI’s automotive eCall reference design offers a robust, low-cost solution that is scalable for other automotive applications, such as telematics, stolen vehicle tracking and HEV/EV sound generation. It also incorporates the TLV70033-Q1 voltage regulator with low quiescent current and the MSP430F2232 16-bit ultra-low power microcontroller.
Key features and benefits of TI’s automotive eCall reference design:
• Loud and clear audio quality: The TPA3111D1-Q1 delivers 10-W output power at 8 Ω with greater than 90 percent efficiency, and offers enhanced EMI suppression to improve sound immunity. This ensures loud and clear audio quality; which is imperative in an eCall system where external conditions can sometimes overwhelm the emergency call.
• Emergency operation: The TPS43330-Q1 pre-boost circuit supports automotive start/stop and boosts back-up battery supply voltage, allowing operation down to 2 V at the input. Combined with the Class D amplifier’s wide supply voltage range of 8 V to 26 V, the components in this reference design can be powered by a single-cell LiFePO4 battery, in case the car battery connection is severed in an accident.
• System protection: The components offered in this system provide over-voltage and load dump protection against input transients of up to 40 V. The Class D amplifier also supports power cycling and speaker open-load detection during initial power-up. These features ensure robust operation in harsh automotive environments and simplify failure analysis.
Availability, packaging and pricing
TI’s automotive eCall reference design schematics and supporting software are available for immediate download
. The featured components are also available for immediate order.
The TPA3111D1-Q1 is available in a 28-pin HTSSOP package, and is priced at US$0.90 in 1,000-unit quantities. The TPA3111D1-Q1 evaluation module (EVM) is available for immediate orders and priced at US$149.00.
The TPS43330-Q1 is available in a 38-pin HTSSOP package and is priced at US$3.00 in 1,000-unit quantities. The TPS43330-Q1 evaluation module (EVM) is available for immediate orders and priced at US$99.00.
The TLV70033-Q1 is available in a 5-pin SOT package and is priced at US$.15 in 1,000-unit quantities.