TFA9843BJ/N1,112

Overview

The TFA9843BJ is a two-channel audio power amplifier featuring Single-Ended (SE) configuration with a fixed gain of 26 dB. It operates within a supply voltage range of 9 V to 26 V and delivers output power from 1 W to 20 W depending on load conditions. The device utilizes a 9-pin DBS9P plastic DIL-bent-SIL power package. Key electrical parameters include a quiescent current of 60 mA typical at 18 V, standby current under 10 μA, and supply voltage ripple rejection of 60 dB at 1 kHz.

Feature Summary

• Integrated protection circuit based on multiple internal temperature measurements for optimized output power without unnecessary audio holes.
• Soft clipping functionality combined with standby and mute modes to eliminate on/off switching plops.
• High supply voltage ripple rejection capability ensuring stable performance under varying power conditions.
• Comprehensive output protection against short circuits to ground, supply, and across the load.

Applications

• Televisions
• Monitors
• PC speakers
• Boom boxes
• Mini and micro audio receivers

Procurement Notes

Verify the specific ordering suffix N1,112 against manufacturer documentation to confirm packaging details and compliance status. Ensure the component source matches the Philips Semiconductors or NXP USA Inc. lineage as indicated in the datasheet revision history. Confirm that the DBS9P package variant aligns with your PCB footprint requirements before finalizing procurement orders.

Selection Notes

Select this component for applications requiring dual SE channels with high efficiency and robust thermal management. The fixed 26 dB gain simplifies design integration by reducing external component count. Consider the thermal resistance characteristics when designing heatsinks, particularly for high-power operations exceeding 5 W per channel. Verify input impedance matching for optimal signal integrity.

Part Context

The TFA9843BJ belongs to the TFA984x series of audio amplifiers, sharing pin compatibility with the TFA9841J, TFA9842J, TFA9842BJ, and TFA9843J. This series is designed for versatile audio power applications, offering scalable performance through different channel configurations and gain settings while maintaining a consistent physical interface for easy board layout transitions.

Replacement Considerations

The TFA9843BJ is pin compatible with the TFA9841J, TFA9842J, TFA9842BJ, and TFA9843J. Substitution requires verification of gain settings and output power capabilities, as these parameters vary between models in the series despite identical pinouts.

FAQ

How does the protection circuit function?

The protection circuit uses multiple internal temperature sensors to monitor local power stage temperatures and global chip temperature. If thresholds are exceeded, it temporarily switches off the power stages to prevent damage, automatically resuming operation once temperatures normalize.

What is the purpose of the SVR pin?

The SVR pin is used for half-supply voltage decoupling to enhance supply voltage ripple rejection. Connecting a low ESR capacitor here improves noise performance and THD, particularly at lower frequencies.