BD5427EFS-E2

Overview

The BD5427EFS-E2 is a stereo Class-D speaker amplifier IC manufactured by ROHM Semiconductor. It delivers 7W + 7W output power into an 8Ω load with 80% efficiency. The device operates on a single supply voltage ranging from 10V to 16.5V and supports minimum load resistances of 6Ω. Key electrical parameters include a voltage gain of 28dB, total harmonic distortion plus noise of 0.1%, and crosstalk of 85dB. It utilizes an HTSSOP-A44 package (5mm × 7.5mm × 1.0mm) with back-surface heat radiation.

Feature Summary

• High-efficiency operation reaching 80% at rated output with low heat generation.
• Integrated soft-switching technology reduces pop noise during power on/off and interruption.
• Master/slave function synchronizes multiple devices to minimize beat noises.
• Adjustable internal PWM sampling clock frequency mitigates radio emission interference.

Applications

• Low-profile television sets
• Space-saving audio systems
• Applications requiring high-quality sound playback with minimal thermal footprint

Procurement Notes

Verify the specific suffix E2 corresponds to the embossed tape and reel packaging format as defined in the ordering information. Confirm that the component meets RoHS standards for the intended market. Ensure the design accommodates the required minimum order quantity multiples specified by the manufacturer's delivery specifications.

Selection Notes

Select this component when designing for applications requiring compact form factors and reduced thermal management needs. The integrated back-surface heat radiation allows for operation without external radiators up to 14W total output. Consider the adjustable clock frequency if strict adherence to AM radio band emission limits is necessary for the final product.

Part Context

This part belongs to the BD54 series of middle-power Class-D speaker amplifiers developed by ROHM Semiconductor. The series focuses on utilizing BCD process technology to eliminate turn-on resistance and internal line losses. The BD5427EFS variant specifically targets stereo audio applications where space constraints and heat dissipation are critical design parameters.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.

FAQ

How does the device handle instantaneous power interruptions?

The BD5427EFS-E2 includes a VHOLD pin that detects instantaneous power interruptions. This feature helps maintain stable operation or manage shutdown sequences smoothly during brief power loss events.

What protection circuits are built into the amplifier?

The IC features built-in protections against high temperatures (TSD), VCC shorting, GND shorting, reduced voltage (UVLO), and DC voltage application to the speaker outputs. Warning and Error flags are also available via dedicated pins.

Can the internal sampling clock frequency be adjusted?

Yes, the internal PWM sampling clock frequency can be adjusted between 250kHz and 400kHz by connecting a resistor to the ROSC pin. This adjustment aids in protecting against unwanted radio emissions in the AM band.