HT6809 datasheet(4/6 Pages) HEROIC

4 / 6 page

HT6809

-4-

Mar. 2011 V1.0

3W Ultra Low-EMI Anti-Clipping Stereo Class D Audio

Power Amplifier with Digital Volume Control

FEATURES

・

Anti-Clipping Function (ACF)

・

Excellent EMI Suppression Performance

・

Optimized PWM Output Stage Eliminating

Output Filter

・

32 Step Digital Volume Control (DVC)

・

Maximum Output

3.0 W×2ch (VDD=5.0V, RL=4Ω, THD+N=10%)

1.9 W×2ch (VDD=5.0V, RL=8Ω, THD+N=10%)

・

Efficiency

85% @ VDD =5.0V, RL=4Ω, PO=1W

・

Low THD+N

0.1%@ VDD =5.0V, RL=4Ω, PO=1W

・

Channel Separation

80dB@fIN=1kHz, Av=18dB

・

High S/N Ratio

90dB@ VDD =5.0V, Av=18dB

・

Excellent Click-Pop Noise Reduction Function

・

MUTE Function

・

Independent Channel Power Down Function

・

Over-Current Protection Function, Thermal

Protection Function

・

Low Voltage Malfunction Prevention Function

・

Pb-Free Package, TSSOP-20, QFN-20

APPLICATIONS

・

Portable Speakers, USB Speakers, FM Speakers

・

MP3/MP4

・

Portable Gamers, Digital Photo Frame

・

Mobile Phone, Notebook PC

・

Small Size LCD TV/Monitors

GENERAL DESCRIPTION

HT6809 is an internal integrated 32-step digital

volume control, ultra Low-EMI, Anti-Clipping stereo

Class D audio power amplifier IC with maximum

output power of 3W, efficiency up to 90%.

HT6809 features Anti-Clipping Function (ACF)

which detects output signal clip due to the over

input signal and suppresses the output signal clip

automatically. Also the ACF function can adapt the

output clip caused by power supply voltage down

with battery. It can significantly improves the sound

quality, creating a very comfortable musical

enjoyment, and to protect the speakers from

overload damage. In addition Sound quality and

output power can be freely set by external

resistance or capacitance of ACRC.HT6809 also

supply ACF OFF mode.

HT6809 has excellent EMI radiation suppression

characteristics, well below the FCC Part15 Class B

standards, simplifying system design and lowering

system cost.

HT6809 has a “Pure Pulse Direct Speaker Drive

Circuit” which directly drives speakers while

reducing distortion of pulse output signal and

reducing noise on the signal, and realizes the

highest standard low distortion rate characteristics

and low noise characteristics among digital

amplifier ICs for portable use.

HT6809 has the independent Shutdown function

which can minimize the power consumption at

standby and MUTE function. As for protection

function, over current protection function for

speaker

output

terminals,

over

temperature

protection function, and low supply voltage

malfunction preventing function are also prepared.

HT6809 is available in Pb-Free TSSOP-20 and

QFN-20 package.

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