Datasheet Texas Instruments TPA6045A4CRHBR — 数据表

TPA6045A4C
www.ti.com. SLOS614 – OCTOBER 2008 2-W STEREO AUDIO POWER AMPLIFIER
WITH DirectPathв„ў STEREO HEADPHONE DRIVE AND REGULATOR
FEATURES 1 Microsoftв„ў Windows Vistaв„ў Compliant Fully Differential Architecture and High PSRR
Provide Excellent RF Rectification Immunity 2.1-W, 1% THD+N Into 4-Ω Speakers and
85-mW, 1% THD+N Into 16-Ω Headphones
From 5-V Supply DirectPathв„ў Headphone Amplifier Eliminates
Output Capacitors (1) Internal 4-Step Speaker Gain Control: 10, 12,
15.6, 21.6 dB and Fixed –1.5-V/V Headphone 3.3-V Low Dropout Regulator for CODEC Independent Shutdown Controls for Speaker,
Headphone Amplifier, and Low Dropout
Regulator (LDO) Output Short-Circuit and Thermal Protection
23 DESCRIPTION
The TPA6045A4C is a stereo audio power amplifier
and DirectPathв„ў headphone amplifier in a thermally
enhanced, space-saving, 32-pin QFN package. The
speaker amplifier is capable of driving 2.1 W per
channel continuously into 4-Ω loads at 5 V. The
headphone amplifier achieves a minimum of 85 mW
at 1% THD+N from a 5-V supply. A built-in internal
4-step gain control for the speaker amplifier and a
fixed –1.5 V/V gain for the headphone amplifier
minimizes external components needed.
Independent shutdown control and dedicated inputs …