AN5278

Overview

The AN5278 is a monolithic integrated circuit designed for 4.8 W × 1 channel OTL (18 V, 8 Ω) output audio power amplifier suitable for TV application. It operates within a supply voltage range of 12 V to 26 V with a typical value of 18 V. The device features built-in volume and tone control functions, eliminating the need for external Boucherot cells or bootstrap capacitors. It includes an internal DC mute function during power-off and an AC mute pulse during power-on/off transitions. The component utilizes an HSIP009-P-0000 package.

Feature Summary

• Integrates volume and tone control circuits directly into the power amplifier stage
• Includes internal AC mute and DC mute functions to suppress startup and shutdown noise
• Requires minimal external components by omitting Boucherot cells and bootstrap capacitors

Applications

• Television sets

Procurement Notes

Verify the specific package designation HSIP009-P-0000 matches the required footprint. Confirm that the operating temperature range of -20 °C to +70 °C aligns with the target environment. Ensure the design accounts for the necessity of an external heatsink fixed to the chassis due to the package's thermal characteristics.

Selection Notes

Select this component for applications requiring a single-channel audio amplifier with integrated signal processing controls. The fixed internal gain of 30 dB simplifies circuit design. Consider the logarithmic volume characteristic and the specific tone control voltage ranges when designing the user interface logic.

Part Context

This part belongs to the ICs for Audio Common Use series. It serves as a complete audio solution combining amplification with pre-amplification stages. The design focuses on reducing external component count while maintaining performance suitable for consumer electronics like televisions.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.

FAQ

How does the AN5278 handle shock noise during power cycles?

It uses an internal AC mute pulse during power ON/OFF to mute input signals and noise. During power OFF, an internal DC mute pulse quickly lowers the output DC level to discharge residual charge, reducing shock noise at the next start-up.

What is the maximum attenuation level of the volume control?

When the volume control voltage is at 0 V, the gain reaches its minimum, resulting in a maximum attenuation of -69 dB.