HT6845
3.4W Low-EMI Anti-Clipping
Mono Class D Audio Power Amplifier
FEATURES
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.
・Anti-Clipping Function(ACF)
・Excellent EMI Suppression Performance
・Optimized PWM Output Stage Eliminating LC
Output Filter
・Maximum Output
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.
3.2 W×1ch (VDD=5.0V, RL=4ꢀ, THD+N=10%)
0.9 W×1ch (VDD=3.6V, RL=8ꢀ, THD+N=10%)
・Efficiency
91% (VDD=5.0V, RL=8ꢀ, Po=1W)
88% (VDD=3.6V, RL=8ꢀ, Po=600mW)
78% (VDD=3.6V, RL=8ꢀ, 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
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.
APPLICATIONS
・Mobile phones, iPhone, Mp3/Mp4 docking
・PDAs, GPS, Digital Photo Frame
・PMP/MP4 players, Portable Gamers
・Portable Speakers, USB Speakers
HT6845 has shutdown mode, over-current
protection, over-temperature protection and low
supply voltage malfunction preventing function.
HT6845 is available in WLCSP-9 package.
Copyright©2011, Jiaxing Heroic Technology Co., Ltd
-4-
Mar. 2011 V1.0