TDA8547TS/N1/02,11

Overview

The TDA8547TS is a two-channel audio power amplifier delivering 2 × 0.7 W output power to a 16 Ω load at a 5 V supply, or 0.6 W to an 8 Ω load at 3.3 V. It features Bridge-Tied Load (BTL) architecture with complementary PNP-NPN output stages and integrated standby/mute logic controlled via MODE and SELECT pins. The device supports single-channel operation for up to 1.2 W output. Key electrical parameters include a supply voltage range of 2.2 V to 18 V, typical quiescent current of 15 mA for dual channels, and standby current below 10 μA. Total harmonic distortion is typically 0.15% at 0.4 W output.

Feature Summary

• Integrated channel switching capability allowing selection between output channels via the SELECT pin to reduce quiescent current consumption.
• Complementary PNP-NPN output stage design providing low saturation voltage and high efficiency in bridge-tied load configurations.
• Built-in protection mechanisms including thermal shutdown and short-circuit safety to ground, VCC, and across the load.
• CMOS-compatible standby and mute control logic that eliminates switch-on/switch-off plop noise during state transitions.

Applications

• Telecommunication equipment
• Portable consumer products
• Personal computers
• Motor-driver (servo)

Procurement Notes

Verify the specific ordering suffix /N1/02,11 against the manufacturer's latest documentation to confirm package type and compliance status. Ensure the design accounts for the SSOP20 thermal resistance characteristics and PCB layout requirements specified in the datasheet. Confirm availability as product status may vary; consult official NXP channels for current production lifecycle information before finalizing procurement plans.

Selection Notes

Select this component for applications requiring dual-channel audio amplification with independent channel control. The device is suitable for low-voltage systems operating between 2.2 V and 18 V. Consider the SSOP20 package constraints for thermal management. Verify that the required gain setting falls within the 6 dB to 30 dB range adjustable by external feedback resistors. Ensure input impedance and drive capabilities match the source signal requirements.

Part Context

The TDA8547TS belongs to the NXP TDA85xx series of audio power amplifiers. It shares architectural similarities with related parts like the TDA8542TS but offers specific channel switching functionality. The device is designed for integration into compact electronic systems where space efficiency and low power consumption are critical. It utilizes a plastic shrink small outline package (SSOP) for surface-mount assembly.

Replacement Considerations

Direct substitutes include the TDA8542TS, which shares similar BTL amplifier characteristics. Verify pin compatibility and functional equivalence regarding channel switching and control logic before substitution. Review thermal dissipation requirements and package dimensions to ensure mechanical fit in existing designs.

FAQ

How is the output channel switching controlled?

Channel switching is managed via the SELECT pin. Setting SELECT to LOW activates Channel 2 while putting Channel 1 in standby. Setting SELECT to HIGH activates Channel 1 while putting Channel 2 in standby. Leaving it floating allows both channels to operate.

What is the maximum output power when only one channel is used?

When only one channel is active, the maximum output power is 1.2 W, depending on the supply voltage and load impedance conditions.

Does the device produce plop noise during switching?

Switching channels directly without prior muting can cause plop noise due to input capacitor charging. To achieve plop-free switching, set the MODE pin to mute first, adjust the SELECT pin, wait for the necessary delay, and then set MODE to operational.