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HOME > Products > Audio Power Amplifier IC > Mono Class D Audio Power Amplifier

HT6879
3.5W Ultra Low-EMI Anti-Clipping Mono Class D Audio Power Amplifier with Digital Volume Control

HT6879 is a low-EMI, Anti-Clipping, filter-less, monaural Class D audio power amplifier IC with maximum output power of 3.5W, integrated 32-step digital volume control function. It has a high efficiency in a variety of audio terminal applications with Class AB amplifier performance.

HT6879 has excellent EMI radiation suppression characteristics. The radiation level is well below FCC Part15 Class B standards without any additive design. It keeps from interference with other EMI sensitive circuits, simplifies system design and lowers system cost.

HT6879 features Anti-Clipping Function (ACF) which detects and suppresses output signal clippings due to the over level inputs of music or voice signals. The ACF function also can adapt the output clippings caused by power supply voltage down in battery applications. It improves acoustical qualityconsiderably,givesgreatlistening enjoyment, and prevents speaker from overload damaging. According to different audio sources, two modes, ACF-1 and ACF-2, could be selected to achieve a best audio performance.

HT6879 has a filter-less modulation circuit which directlydrivesspeakerswhilerealizeslow distortion and low noise characteristics. Thanks to filter-less, circuit design with fewer external parts can be made in portable applications.

HT6879hasshutdownmode,over-current protection, over-temperature protection and low supply voltage malfunction preventing function.

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FEATURES

  • Patented technology(EDMA) to reduce the internal Rdson and heat loss, increase the output power

    Po=3.5 W (VDD=5.0V, RL=4?, THD+N=10%)

    Po=3.0 W (VDD=3.7V, RL=2?, THD+N=10%)

  • Excellent EMI Suppression Performance
    a) Using Patented technology (AROC, Active edgeRingingandOvershootControl circuitry)b) The radiation level is highly lower than FCC Part15 Class B standard;
    c) Without interference to FM radio, CMMB, GSM, CDMA, Bluetooth and any other sensitive modules with different bands;
    d) the difficulty of system design is reduced

  • THD+N=0.1% (RL=4?, PO=1W, f=1kHz)

  • low noise, High SNR

  • 32 step Digital Volume Control (DVC)

  • Anti-Clipping Function (ACF)

  • Excellent Click-Pop Noise reduction function

  • Low Shutdown Current, 0.1μA

  • Over current protection function

  • Filter-less Modulation, Eliminating Output Filter

  • Over Current Protection, Thermal Protection,Low voltage malfunction prevention function included

  • Pb-Free Packages, MSOP10, MSOP10-PP

APPLICATIONS

  • Bluetooth Speakers

  • Portable Speakers

  • 2.1 Channel Speakers

  •  Megaphone

  • ipad/iphone/ipod docking

  • MP4/GPS

  • Tablet PC/Note Book

  • Smart phones

  • LCD TV/Monitor

  • Portable Gamers


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 TERMINAL FUNCTION*1

MSOP/DFN

Terminal No.

Name

I/O

ESD

composition

Function

1

BYPASS

A

PN

Analog reference terminal

2

UP

A

PN

Volume up

3

DN

A

PN

Volume down

4

IN-

A

PN

Negative input terminal (differential -)

5

IN+

A

PN

Positive input terminal (differential +)

6

OUT+

O

-

Positive output terminal (differential +)

7

VDD

Power

-

Power supply

8

GND

GND

-

GND

9

OUT-

O

-

Negative output terminal (differential -)

10

CTRL

I

PN

Shutdown and ACF control terminal

*1: Input terminal O:  Output terminal A:  Analog terminal

when a voltage that is higher than the VDD potential is impressed into the terminal of PN (ESD protection circuit is

composed of PMOS and NMOS), the leakage current flows through the protection circuit of PMOS.