TDA1562ST/N3C,112

Overview

The TDA1562ST/N3C,112 is a monolithic integrated 70 W/4 Ω Bridge-Tied Load (BTL) class-H high efficiency power amplifier manufactured by NXP USA Inc. It operates from a single low supply voltage ranging from 8 V to 18 V. The device features a 17-lead RDBS17P plastic rectangular-DIL-bent-SIL package. Key electrical parameters include a typical quiescent current of 110 mA and a standby current of 35 μA. It provides differential inputs with high common mode rejection and includes diagnostic capabilities for short-circuit, open load, and temperature protection.

Feature Summary

• Class-H architecture enables very high output power while maintaining low power dissipation during music signal operation
• Integrated diagnostic facility monitors dynamic distortion, short circuits, open loads, and thermal conditions
• Operates without switch-on or switch-off plops and features fast mute on supply voltage drops
• Includes load dump protection and is short-circuit safe to ground, supply voltage, and across the load

Applications

• Car audio systems such as car radios and boosters
• Mains fed midi and mini audio combinations
• TV sound applications
• Car telephony and navigation systems requiring quick start options

Procurement Notes

Verify the specific ordering suffix and package variant against the official NXP datasheet before procurement. Confirm that the component meets the required automotive or industrial environmental standards for your specific application environment. Check for any recent product change notifications regarding manufacturing updates.

Selection Notes

Select this amplifier when high efficiency and diagnostic feedback are required in a single-supply BTL configuration. Ensure the heatsink design accounts for the reduced dissipation characteristics of class-H operation with music signals. Verify that the external lift capacitors are sized correctly to support the desired low-frequency power roll-off performance.

Part Context

This component belongs to the TDA1562 series of high-efficiency power amplifiers. It is designed primarily for automotive and mains-fed audio applications where space and thermal constraints are critical. The class-H topology distinguishes it from standard class-B amplifiers by utilizing lifted supply voltages for higher peak power delivery.

Replacement Considerations

Consult the official NXP documentation for confirmed substitute part numbers within the TDA1562 family, such as the TDA1562Q or TDA1562SD, ensuring pin compatibility and package specifications match the existing design requirements.

FAQ

How does the class-H operation affect power dissipation compared to class-B?

Under normal use with music-like signals, the reduction in dissipation is about 50% compared to a class-B output amplifier with the same output power.

What happens if the case temperature exceeds 120 °C?

The device switches back from class-H to class-B operation, disabling the high power supply voltage and limiting the output power to 20 W.