TDA8948J/N1,112

Overview

The TDA8948J is a four-channel audio power amplifier manufactured by NXP USA Inc., housed in a DBS17P plastic DIL-bent-SIL package. It supports Single-Ended (SE) and Bridge-Tied Load (BTL) configurations with fixed gains of 26 dB and 32 dB respectively. Operating within a supply voltage range of 9 V to 26 V, it delivers up to 18 W per channel in SE mode and 36 W in BTL mode at 10% THD. The device features soft clipping, low standby current, and comprehensive protection against short circuits and thermal overload.

Feature Summary

• Four identical amplifiers configurable as four SE channels, two BTL channels, or a 2.1 system.
• Unique protection circuit based on multiple internal temperature measurements for maximum output power.
• Soft clipping functionality combined with no on/off switching pops.
• High supply voltage ripple rejection and low quiescent current consumption.

Applications

• Television sets
• PC speakers
• Boom boxes
• Mini audio receivers
• Micro audio receivers

Procurement Notes

Verify the specific ordering suffix and revision level against the manufacturer's latest documentation to ensure compatibility with current manufacturing standards. Confirm that the DBS17P package dimensions align with the target printed circuit board layout requirements before finalizing procurement decisions.

Selection Notes

Select this component when a multi-channel solution is required for compact audio systems. Ensure the application design accounts for the minimum load requirements at supply voltages exceeding 22 V. Evaluate thermal management strategies based on the specified junction-to-case thermal resistance and expected ambient operating conditions.

Part Context

This part belongs to the TDA894x series of audio amplifiers from NXP Semiconductors. It shares pin compatibility with the TDA8944AJ, TDA8946AJ, and TDA8947J models, facilitating potential design upgrades or replacements within existing hardware architectures without requiring significant PCB modifications.

Replacement Considerations

The TDA8948J is pin compatible with the TDA8944AJ, TDA8946AJ, and TDA8947J. Verify functional differences and power ratings when substituting these specific parts.

FAQ

How does the TDA8948J handle thermal protection?

It uses a unique protection circuit based on multiple temperature measurements inside the chip. If local temperatures reach approximately 185 °C or global temperature reaches 150 °C, the power stages switch off for 2 ms to prevent damage.

What are the minimum load requirements for high supply voltages?

For supply voltages greater than 22 V, a minimum load of 3 Ω is required for Single-Ended operation and 6 Ω for Bridge-Tied Load operation.