TDF8546TH

I²C-bus controlled 4 x 45 W best efficiency amplifier


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The TDF8546 is one of a new generation of complementary quad Bridge-Tied Load (BTL) audio power amplifiers intended for automotive applications. It has a best efficiency mode with full I²C-bus controlled diagnostics, including start-up diagnostics. The TDF8546 can operate at a battery voltage as low as 6 V making this amplifier suitable for stop/start-car operation.

The new best efficiency principle uses a patented switch technique which reduces switching distortion. To reduce power dissipation, the new best efficiency principle uses the audio information on all four channels instead of only the front or rear signals. Dissipation is more than 65 % less than standard BTL when used for front and rear correlated audio signals. Dissipation is 35 % less than standard BTL when used for uncorrelated (delayed) audio signals between front and rear, and 17 % less for uncorrelated audio signals when the front or rear information is used.

The amplifier uses a complementary DMOS output stage in a Silicon-On-Insulator (SOI)- based BCD process. The DMOS output stage ensures a high power output signal with perfect sound quality. The SOI-based BCD process ensures a robust amplifier, where latch-up cannot occur, with good separation between the four independent channels, with every component isolated and without substrate currents.

Features and benefits

  • Stop/start-car prepared: keeps operating without audible disturbance during engine start at a battery voltage as low as 6 V
  • New 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 best efficiency mode
  • Operates in either legacy (non I²C-bus) or I²C-bus modes (3.3 V and 5 V compliant)
  • Four hardware-programmable I²C-bus addresses
  • Can drive 2 Ω and 4 Ω loads
  • Speaker fault detection
  • Start-up diagnostics with load detection: open, short, present; filtered for door-slam and chatter relays
  • AC load (tweeter) detection with low and high current mode
  • Gain select after start-up without audible disturbance
  • Independent selectable soft mute of front and rear channels
  • Programmable gain (26 dB and 16 dB), independently programmable for the front and rear channels
  • Line driver mode supports engine start at a battery voltage as low as 6 V (16 dB and mid-tap voltage 0.25 VP)
  • Programmable clip detect: 2 %, 5 % or 10 %
  • Programmable thermal pre-warning
  • Pin STB can be programmed/multiplexed with second-clip detect
  • Clip information of each channel can be directed separately to pin DIAG or pin STB
  • Independent enabling of thermal-, clip- or load fault information (short across the load or to VP or to ground) on pin DIAG
  • Loss-of-ground and open VP safe (minimum series resistance required)
  • All amplifier outputs short-circuit proof to ground, supply voltage and across the load (channel independent)
  • All pins short-circuit proof to ground
  • Temperature controlled gain reduction to prevent audio holes at high junction temperatures
  • Programmable low battery voltage detection to enable 7.5 V or 6 V minimum battery voltage operation
  • Overvoltage protection (load-dump safe up to VP = 50 V) with overvoltage pre-warning at 16 V
  • Offset detection
All information on this product information page is subject to the subsequent disclaimers:
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Parametric search

Parametrics of this product

Type numberPackagePackage nameProduct statusChannel configurationRMS power(W)RemarksGain(dB)
TDF8546THSOT851-2
(HSOP36)		HSOP36ProductionBTL/quad4 x 25I2C Bus diagnostic26

Package

Type numberOrderable part numberOrdering code (12NC)Product statusPackagePackingMarking
TDF8546TH/N2TDF8546TH/N2,1189352 977 57118Volume productionSOT851-2
(HSOP36) 		Reel Pack, SMD, 13"Standard Marking

The variants in the table below are discontinued. See the table Discontinuation information at the bottom of this page for more information.

Type numberOrderable part numberOrdering code (12NC)Product statusPackagePackingMarking
TDF8546TH/N1TDF8546TH/N1,5189352 945 32518Discontinued
Replacement product		SOT851-2
(HSOP36) 		Reel Dry Pack, SMD, 13"Standard Marking

Outline drawing

Package VersionPackage NamePackage DescriptionReference CodesIssue Date
SOT851-2HSOP36plastic, heatsink small outline package; 36 leads; low stand-off height2004-05-04

Related documents

Reflow soldering

Discontinuation information

Type numberOrdering code (12NC)Last-time buy dateLast-time delivery dateReplacement productDN NoticeStatusComments
TDF8546TH/N193529453251830-Sep-1331-Dec-13TDF8546TH/N2DN NXP-DN_201212003DNVersion WithdrawalStandard End of Life. Sole Source.

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHSLeadfree conversion dateRHFIFR (FIT)MTBF (hours)MSLMSL LF
TDF8546TH/N2TDF8546TH/N2,118TDF8546TH/N211

The variants in the table below are discontinued. See the table Discontinuation information at the bottom of this page for more information.

Type numberOrderable part numberChemical contentRoHSLeadfree conversion dateRHFIFR (FIT)MTBF (hours)MSLMSL LF
TDF8546TH/N1TDF8546TH/N1,518Not available33
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Discontinuation information

Type numberOrdering code (12NC)Last-time buy dateLast-time delivery dateReplacement productDN NoticeStatusComments
TDF8546TH/N193529453251830-Sep-1331-Dec-13TDF8546TH/N2DN NXP-DN_201212003DNVersion WithdrawalStandard End of Life. Sole Source.

Documentation for this product

File nameTitleTypeFormatDate
75017062Continous sound experience for stop/start carsLeafletpdf2011-09-27
75017414Seamless sound experience for stop and start carsLeafletpdf2013-05-01

Ordering & availability

Type numberOrdering code (12NC)Orderable part numberRegionDistributorIn stockOrder quantityInventory dateBuy onlineSamples
TDF8546TH/N29352 977 57118TDF8546TH/N2,118       

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