參數(shù)資料
型號(hào)： MAX9773ETG+T
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 2/21頁(yè)
文件大?。?/td> 0K
描述： IC AMP AUDIO PWR 1.8W D 24TQFN
標(biāo)準(zhǔn)包裝： 2,500
類型： D 類
輸出類型： 2 通道（立體聲）
在某負(fù)載時(shí)最大輸出功率 x 通道數(shù)量： 1.8W x 2 @ 4 歐姆
電源電壓： 2.6 V ~ 5.5 V
特點(diǎn)： 消除爆音，差分輸入，短路和熱保護(hù)，關(guān)閉
安裝類型： 表面貼裝
供應(yīng)商設(shè)備封裝： 24-TQFN-EP（4x4）
封裝/外殼： 24-WFQFN 裸露焊盤
包裝： 帶卷 (TR)
MAX9773
Detailed Description
The MAX9773 ultra-low EMI, filterless, stereo Class D
audio power amplifier incorporates several improve-
ments to switch-mode amplifier topology. The MAX9773
features output-driver AEL circuitry to reduce EMI. Zero
dead time technology maintains state-of-the art efficien-
cy and THD+N performance by allowing the output FETs
to switch simultaneously without cross conduction. The
MAX9773 offers Class AB performance with Class D effi-
ciency, while occupying minimal board space. A unique,
filterless modulation scheme, synchronizable switching
frequency, and spread-spectrum switching mode create
a compact, flexible, low-noise, efficient audio power
amplifier. The differential input architecture reduces
common-mode noise pickup, and can be used without
input-coupling capacitors. The inputs can also be config-
ured to accept a single-ended input signal.
Comparators monitor the MAX9773 inputs and compare
the complementary input voltages to the sawtooth wave-
form. The comparators trip when the input magnitude of
the sawtooth exceeds their corresponding input voltage.
Both comparators reset at a fixed time after the rising
edge of the second comparator trip point, generating a
minimum-width pulse (tON(MIN)) at the output of the sec-
ond comparator (Figure 1). As the input voltage increases
or decreases, the duration of the pulse at one output
increases while the other output pulse duration remains
the same. This causes the net voltage across the speaker
(VOUT+ - VOUT-) to change. The minimum-width pulse
helps the device to achieve high levels of linearity.
1.8W, Filterless, Ultra-Low EMI,
Stereo Class D Audio Power Amplifier
10
______________________________________________________________________________________
OUT+
OUT-
VIN-
VIN+
VOUT+ - VOUT-
tON(MIN)
tSW
Figure 1. MAX9773 Outputs with an Input Signal Applied
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