HT6871 datasheet(4/6 Pages) HEROIC

4 / 6 page

HT6871

-4-

Mar. 2011 V1.0

3.4W Low-EMI Anti-Clipping Filter-Less

Mono Class D Audio Power Amplifier

FEATURES

・

Anti-Clipping Function, ACF

・

Excellent EMI Suppression Performance

・

Filter-less Modulation, Eliminating Output Filter

・

Output Power（WLCSP-9）

3.4 W (VDD=5.0V, RL=4Ω, THD+N=10%)

・

Output Power（SOP-8）

2.5 W (VDD=5.0V, RL=4Ω, THD+N=10%)

・

High Efficiency

91% (VDD=5.0V, RL=8Ω, PO=1W, WLCSP-9)

88% (VDD=3.6V, RL=8Ω, PO=0.6W, WLCSP-9)

89% (VDD=5.0V, RL=8Ω, PO=1W, SOP-8)

・

Excellent Click-Pop Noise Reduction Function

・

High SNR：95dB (VDD=5V, Av=18dB)

・

Low Shutdown Current：0.01µA

・

Over-Current Protection Function

・

Thermal Protection Function

・

Low Voltage Malfunction Prevention Function

・

Pb-Free Packages, SOP-8 or WLCSP-9

APPLICATIONS

・

Portable Speakers

・

USB Speakers

・

iphone/ipod, MP3/4 docking ・PSP

・

PMP/MP4/MP5

・

GPS

・

Digital Photo Frame

・

Mobile Phones

・

PDAs

GENERAL DESCRIPTION

HT6871 is a low-EMI, Anti-Clipping, filter-less,

monaural Class D power amplifier with an output

power of 3.4W (WLCSP-9 Packages). It has a high

efficiency for various applications with Class AB

amplifier performance.

HT6871 features Anti-Clipping Function (ACF)

which detects and suppresses output signal

clippings due to the over level inputs. ACF function

also can adapt the output clippings caused by

power supply voltage down in battery applications.

It improves acoustical quality considerably, gives

great listening enjoyment, and prevents speaker

from overload damaging. According to different

application requirements, two modes of ACF-1 and

ACF-2 could be selected to achieve a maximal

THD+N of 3% and 10% respectively.

HT6871 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.

HT6871 has a filter-less modulation circuit which

directly drives speakers, realizes highest standard

low distortion and low noise characteristics among

digital amplifier ICs for mobile use. Thanks to

filter-less, circuit design with fewer external parts

can be made in portable applications.

HT6871

has

shutdown

mode,

over-current

protection, over-temperature protection and low

supply voltage malfunction preventing function.

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