TFA9815T/N1,112

Overview

The TFA9815T/N1,112 is a dual-switching power comparator designed for high-efficiency Class D audio amplifier systems. It integrates two full-bridge Bridge-Tied Load (BTL) power stages, drive logic, protection control logic, and full differential input comparators. The device supports both closed-loop self-oscillating and open-loop configurations. It operates on an asymmetrical supply voltage ranging from 8 V to 20 V. The continuous output power reaches 2 × 17 W in a full-bridge BTL application without requiring an external heat sink.

Feature Summary

• Stereo full-bridge audio amplifier architecture optimized for Class D applications
• Zero dead-time switching capability with current-limiting that prevents audible interruptions
• Integrated thermal protection eliminating the need for external heat sinks
• Comprehensive protection suite including overtemperature, overcurrent, overvoltage, undervoltage, overdissipation, and window protection

Applications

• Self-oscillating or open-loop Class D audio amplifier systems
• Flat-panel television sets
• Flat-panel monitors
• Multimedia systems
• Wireless speakers

Procurement Notes

Verify the specific ordering suffix N1,112 against official documentation to confirm material declaration and environmental compliance status. Confirm package details match the SO32 plastic small outline package with 32 leads. Ensure design requirements align with the asymmetrical supply voltage range of 8 V to 20 V and the thermal characteristics defined for the component.

Selection Notes

Select this component for designs requiring a compact stereo Class D amplifier solution without external heatsinking. It is suitable for applications needing either self-oscillating or open-loop control modes via the SO/OL pin configuration. Consider the 8 V to 20 V operating voltage range and the integrated protection features when designing the power supply and load interface circuits.

Part Context

The TFA9815 serves as a primary building block for stereo high-efficiency Class D audio power amplifier systems. It functions as a dual-switching power comparator containing full-bridge BTL power stages and differential input comparators. This integration allows for the construction of compact digital audio amplifier systems using minimal external components while maintaining high performance and efficiency.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.

FAQ

How does the TFA9815 handle overcurrent conditions?

If the output current exceeds the maximum threshold, the outputs become floating. The device restarts switching automatically after 5 μs once the fault condition is removed, ensuring no audible interruptions during normal operation.

What determines the configuration mode of the TFA9815?

The configuration is determined by the SO/OL pin. Connecting it to VSSD(HW) enables self-oscillating configuration, while leaving it floating enables open-loop configuration.