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參數(shù)資料
| 型號： | EB-120 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 運動控制電子 |
| 英文描述： | 20W Class D Single Channel Audio Amplifier |
| 中文描述： | 20瓦D類單聲道音頻放大器 |
| 文件頁數(shù)： | 4/13頁 |
| 文件大?。?/td> | 392K |
| 代理商： | EB-120 |
ATA-120
This is preliminary information on a new product. Specifications are subject to change without notice.
129 Morgan Drive, Norwood, MA 02062
voice: (781) 551-9450
CONTROLLED DOCUMENT: P_903-000009_Rev14 ATA-120 Data Sheet.doc
fax: (781) 440-9528
email: apogee@apogeeddx.com
DRN: PRELIMINARY Page 4 of 13
3.0 Functional Description
The ATA-120 is a single-ended Class-D audio amplifier that converts analog audio input signals into PWM pulses.
The pulses drive an internal high current output stage and, when filtered through an external L-C filter, reproduce
the input signal across the load. Because of the switching Class-D output stage, power dissipation in the amplifier
is drastically reduced compared to Class A, Class B or Class A/B amplifiers while maintaining high fidelity and low
distortion.
The amplifier uses a differential input to the modulator. IN_P is the positive input and IN_N is the negative input.
The common mode voltage of the input is set to half the DC power supply input voltage (V
DD
/2) through the
resistive voltage divider formed by R2 and R5. The input capacitor C3 couples the AC input signal into the
amplifier while blocking the DC component.
The output driver stage uses two 180 m
N-channel MOSFETs to deliver the pulses to the L-C output filter which
in turn drives the load. When the output switches low, the bootstrap capacitor, C9, which is located between
POUT and BOOST, is charged from VDD through internal circuitry inside the ATA-120. The gate of the upper
MOSFET is driven from this voltage (higher than VDD but clamped to safe levels by zener diode D2).
3.1 Pop Elimination
The DC-blocking capacitor, C38, allows only AC current to pass to the output load (speaker). To insure that the
amplifier properly passes low frequency signals, the time constant of C38*R
LOAD
needs to be long. Typically the
C11 capacitor charges over a long time period and would normally result in turn-on and/or turn-off “pops”. The
ATA-120, however, includes internal circuitry that eliminates the turn-on and turn-off pops associated with this
charging of the AC coupling capacitor.
3.2 Short Circuit/Overload Protection
The ATA-120 has internal overload and short circuit protection. The currents in both the high-side and low-side
MOSFETs are internally measured and if the current exceeds the 5A (typical) short circuit current limit on either
MOSFET, both MOSFETs are placed in an open condition. After the short circuit condition is removed, the
ATA-120 restarts with the same power up sequence that is used for normal starting to prevent a pop from
occurring.
3.3 Mute/Enable Function
The ENABLE input is an active high enable control. To enable the device, drive ENABLE with a 2.0V or greater
voltage. To disable the amplifier, drive it below 0.4V. While the device is disabled, the VDD operating current is
less than 130μA and the output MOSFETs are turned off. The ATA-120 requires approximately 500ms from the
time that ENABLE is asserted (driven high) to when the amplifier arrives at normal operation.
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