NXP quad Class-AB amplifiers TDF854x for automotive and transportation Seamless sound experience for stop/start cars Designed for use in stop/start cars, these advanced Class-AB amplifiers support listening to audio streams while the car’s internal power supply is down for engine start. They operate in the range of 6 to 18 V. KEY FEATURES `` Keeps operating without audible disturbance during engine start at a battery voltage as low as 6 V `` Low Vp mute level adjustable via I2C (6 V, 8 V) `` Optimized for low pop (guaranteed in test program) `` Full (start-up) diagnostics with flexible read-out `` Programmable DIAG pin `` Second clip-detect pin for additional front/rear detection (mid-tone/bass) `` Family approach with graduated output power (25 W, 28 W) `` Compatible with Best Efficiency quad amplifier (25 W, 28 W) `` Best Efficiency Mode with patented low switching distortion `` Extreme Best Efficiency Mode (uses information from 4 channels) with 17% less dissipation for uncorrelated signals compared to 2-channel high efficiency mode APPLICATION `` Automotive Head Unit `` Automotive Hybrid Sound System The TDF854x family reflects NXP’s ongoing commitment to improving functionality and performance in automotive infotainment systems. Available in configurations with I2C-bus control or a Best Efficiency mode, they operate over a wide voltage range and reduce dissipation. I2C-BUS CONTROL The TDF8541 and TDF8544 are quad Class-AB amplifiers with I2C-bus control. The TDF8541 and TDF8544 use an Asymmetrical or ‘single ended’ input configuration, delivers an output power of 25 W or 28 W, and are available in several bend variants of DBS27 or HSOP36 package. All amplifier qualified AEC -Q100 `` Indication of a short circuit at an amplifier output, short to battery and ground `` DC-load detection: open, short, and present (woofer) `` AC-load detection: for tweeters via series capacitors `` Programmable thermal pre-warning `` Independent short-circuit protection per channel `` Soft thermal clipping to prevent audio holes All devices offer the following features: `` Load dump/over voltage protection `` All amplifier outputs short circuit proof to ground, supply voltage and across the load, independent per channel `` All pins short circuit proof to ground `` Thermal protection to avoid thermal breakdown `` Internally fixed gain of 16 dB or 26 dB `` No plops when switching: - Switch on/switch off - Standby and mute - Mute and operating `` Single mode control pin (standby, operating: mute/on) `` Low standby current `` Low power dissipation in any short-circuit condition `` Outputs are short-circuit proof to ground `` Low Vp mute for fast mute Vp drops `` Line driver mode (16 dB gain in BTL mode) `` Low gain mode for booster mode during engine start BEST EFFICIENCY MODE TDF8546, TDF8546A, and TDF8548A are compatible ClassAB amplifiers with the added intelligence of a Best Efficiency mode. In this mode, the devices use the information on all four channels to enable a 17% lower dissipation with uncorrelated signals. The adaptive control increases efficiency. A patented switch control lowers the switching distortion. The TDF8546 and TDF8546A use an asymmetrical input configuration, delivers 25 W of output power, and is available condition in several bend variants of DBS27 or HSOP36 package. The TDF8548A uses an Asymmetrical or ‘single ended’ input configuration, delivers an output power of 28 W, and is available in several bend variants of DBS27 or HSOP36 package. The bus-controlled features are as follows: `` Diagnostic output gives clip information at selectable and programmable THD levels (2%, 5%, and 10%) Output power 14.4 V; 10% THD @ 4 Ω Input configuration Package Name Class-AB amplifier with I2C control Class-AB amplifier with Best Efficiency mode 25 W Asymmetrical DBS27 TDF8541J/JS/SD TDF8546J/JS TDF8546AJ/SD 25 W Asymmetrical HSOP36 TDF8541TH* TDF8546ATH* TDF8546TH* 28 W Asymmetrical DBS27 TDF8544AJ/SD TDF8544J/SD TDF8548AJ 28 W Asymmetrical HSOP36 TDF8544TH* TDF8548ATH* * Input and output pins use opposite configuration. Package letters Name Description Version J DBS27P Plastic DIL-bent-SIL (special bent) power package; 27 leads SOT827-1 JS DBSMS27P Plastic dual bent surface mounted SIL power package; 27 leads SOT1154-1 SD RDBS27P Plastic rectangular-DIL-bent-SIL (reverse bent) power package; 27 leads SOT878-1 TH HSOP36 Plastic heat sink small outline package; 36 leads; low standoff height SOT851-1 www.nxp.com © 2013 NXP Semiconductors N.V. All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The Date of release: April 2013 information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and Document order number: 9397 750 17414 may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. 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