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Product Detailed Parameters
- Description：IC AMP CLSS AB QUAD 25W 27DBSMSP
- Series：-
- Mfr：NXP USA Inc.
- Package：Tray
- Type：Class AB
- Output Type：4-Channel (Quad)
- Max Output Power x Channels @ Load：25W x 4 @ 4Ohm
- Voltage - Supply：6V ~ 18V
- Features：Depop, Short-Circuit and Thermal Protection
- Mounting Type：Surface Mount
- Supplier Device Package：27-DBSMSP
- Package / Case：27-PowerSMD Module
- Operating Temperature：-
- Grade：-
- Qualification：-
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Overview
The TDF8546AJS/N1ZS is a quad Class-AB audio power amplifier designed for automotive applications. It delivers 25 W output power into a 4 Ω load at 14.4 V with 10% THD. Operating within a 6 V to 18 V supply range, it supports seamless audio during engine start-stop cycles. The device features I2C-bus control, Best Efficiency Mode, and comprehensive diagnostics including clip detection and thermal protection.
Feature Summary
- Operates without audible disturbance during engine start at battery voltages as low as 6 V
- Best Efficiency Mode reduces dissipation by 17% for uncorrelated signals compared to standard high efficiency modes
- Full diagnostic capabilities with programmable thresholds for clipping, short circuits, and thermal warnings
- Optimized for low pop noise during switching between standby, mute, and operating states
Applications
- Automotive Head Unit systems requiring robust performance in stop-start vehicles
- Automotive Hybrid Sound Systems utilizing multiple channel configurations
- Infotainment architectures needing scalable output power with I2C control
- Audio setups requiring low quiescent current and improved electromagnetic immunity
Procurement Notes
Verify component authenticity through authorized NXP channels. Confirm package variant JS corresponds to the DBSMS27P surface mount configuration. Check for end-of-life status or obsolescence notices prior to final design implementation.
Selection Notes
Select this model for applications requiring asymmetrical input configuration and 25 W output power. Ensure compatibility with I2C bus voltage levels of 3.3 V or 5 V. Consider the DBSMS27P package constraints for PCB layout and thermal management requirements.
Part Context
This component belongs to the TDF854x family of quad Class-AB amplifiers. The TDF8546A variant specifically offers lower quiescent current and improved EMI properties compared to the original TDF8546. It shares pin-to-pin compatibility within the family for scalable design options.
Replacement Considerations
TDF8546JS/N1ZS serves as a direct predecessor with similar specifications but potentially higher quiescent current. TDF8546JV/N2ZU offers a heat-slug-less variant of the same package type. Verify specific electrical parameters against datasheets before substitution.
FAQ
How does the Best Efficiency Mode reduce power dissipation?
It utilizes information from all four channels rather than just front or rear signals, reducing dissipation by more than 65% for correlated signals and 17% for uncorrelated signals compared to standard BTL operation.
What diagnostic features are available via the I2C bus?
The amplifier provides clip detection at selectable THD levels (2%, 5%, 10%), DC-load detection (open, short, present), AC-load detection for tweeters, and programmable thermal pre-warning indications.
