HT6845 datasheet(4/6 Pages) HEROIC

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HT6845

-4-

Mar. 2011 V1.0

3.4W Low-EMI Anti-Clipping

Mono Class D Audio Power Amplifier

FEATURES

・

Anti-Clipping Function(ACF)

・

Excellent EMI Suppression Performance

・

Optimized PWM Output Stage Eliminating LC

Output Filter

・

Maximum Output

3.2 W×1ch (VDD=5.0V, RL=4Ω, THD+N=10%)

0.9 W×1ch (VDD=3.6V, RL=8Ω, THD+N=10%)

・

Efficiency

91% (VDD=5.0V, RL=8Ω, Po=1W)

88% (VDD=3.6V, RL=8Ω, Po=600mW)

78% (VDD=3.6V, RL=8Ω, Po=100mW)

・

Excellent Click-Pop Noise Reduction Function

・

High S/N Ratio, 95dB (VDD=3.6V, Av=18dB)

・

Low Shutdown Current, 0.01µA

・

Internal Fixed Gain of 8 V/V (18dB)

・

Over-Current Protection Function

・

Thermal Protection Function

・

Low Voltage Malfunction Prevention Function

・

Pb-Free Packages, 1.45mmx1.6mm 9-ball

WLCSP

APPLICATIONS

・

Mobile phones, iPhone, Mp3/Mp4 docking

・

PDAs, GPS, Digital Photo Frame

・

PMP/MP4 players, Portable Gamers

・

Portable Speakers, USB Speakers

GENERAL DESCRIPTION

HT6845 is a low-EMI, Anti-Clipping, filter-less,

monaural Class D power amplifier with an output

power of 3.4W. It has a high efficiency for mobile

applications with Class AB amplifier performance.

HT6845 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

quality

considerably,

gives

great

listening

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.

HT6845 has excellent EMI radiation suppression

characteristics, well below the FCC Part15 Class B

standards, simplifying system design and lowering

system cost.

HT6845 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.

HT6845

has

shutdown

mode,

over-current

protection, over-temperature protection and low

supply voltage malfunction preventing function.

HT6845 is available in WLCSP-9 package.

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