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參數(shù)資料
| 型號： | MAX4297EWG |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Mono/Stereo 2W Switch-Mode (Class-D) Audio Power Amplifiers |
| 中文描述： | 2 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
| 封裝： | 0.300 INCH, MS-013AD, SOIC-24 |
| 文件頁數(shù)： | 15/18頁 |
| 文件大?。?/td> | 719K |
| 代理商： | MAX4297EWG |
M
Mono/Stereo 2W Switch-Mode (Class-D)
Audio Power Amplifiers
______________________________________________________________________________________
15
Filter Components
The inductor current rating should be higher than the
peak current for a given output power requirement and
should have relatively constant inductance over tem-
perature and frequency. Typically, an open-core induc-
tor is desirable since these types of inductors are more
linear. Toroidal inductors without an air gap are not rec-
ommended. Q-shielded inductors may be required if
the amplifier is placed in an EMI-sensitive system. The
series resistance of the inductors will reduce the atten-
uation of the switching frequency and reduce efficiency
due to the ripple current in the inductor.
The capacitors should have a voltage rating 2 to 3
times the maximum expected RMS voltage
—
allowing
for high peak voltages and transient spikes
—
and be
stable over-temperature. Good quality capacitors with
low equivalent series resistance (ESR) and equivalent
series inductance (ESL) are necessary to achieve opti-
mum performance. Low-ESR capacitors will decrease
power dissipation. High ESL will shift the cutoff frequen-
cy, and high ESR will reduce filter rolloff.
Bridge-Tied Load/Single-Ended
Configuration
The MAX4295/MAX4297 can be used as either a BTL
or single-ended configured amplifier. The BTL configu-
ration offers several advantages over a single-ended
configuration. By driving the load differentially, the out-
put voltage swing is doubled and the output power is
quadrupled in comparison to a single-ended configura-
tion. Because the differential outputs are biased at half
supply, there is no DC voltage across the load, elimi-
nating the need for large DC blocking capacitors at the
output.
The MAX4295/MAX4297 can be configured as single-
ended amplifiers. In such a case, the load must be
capacitively coupled to the filter to block the half-sup-
ply DC voltage from the load. The unused output pin
must also be left open (Figure 5). Do not connect the
unused output pin to ground.
Headphone Applications
The MAX4295/MAX4297 can be used to drive a set of
headphones. A typical 3-wire headphone plug consists
of a tip, ring, and sleeve. The tip and ring are signal
carriers, while the sleeve is the ground connection
(Figure 6). Figure 7 shows the MAX4297 configured to
drive a set of headphones. The OUT+L and OUT+R
pins are connected to the tip and ring and deliver the
signal to the headphone jack, while the OUT-L and
OUT-R pins remain unconnected. The ground connec-
tion in the jack should be connected to the same
ground plane as the output filter.
Total Harmonic Distortion
The MAX4295/MAX4297 exhibit typical THD plus noise
of <1% for input frequencies <10kHz. The PWM fre-
quency affects THD performance. THD can be reduced
by limiting the input bandwidth through the input high-
pass filter, choosing the lowest f
OSC
possible, and care-
fully selecting the output filter and its components.
Bypassing and Layout Considerations
Distortion caused by supply ripple due to H-bridge
switching can be reduced through proper bypassing of
PV
CC
. For optimal performance, a 330μF, low-ESR
POSCAP capacitor to PGND and a 1μF ceramic capac-
itor to GND at each PV
CC
input is suggested. Place the
1μF capacitor close to the PV
CC
pin. Bypass V
CC
with
C
c
R
L
C1
OUT+
OUT-
16
MAX4295
L1a
1
Figure 5. MAX4295 Single-Ended Configuration
SLEEVE
(GND)
TIP
(LEFT)
RING
(RIGHT)
Figure 6. Typical 3-Wire Headphone Plug
LEFT
RIGHT
GND
HEADPHONE JACK
MAX4297
C
C
C
C
C2
a
C1
a
L1
L2
5
20
8
17
OUT+L
OUT-L
OUT+R
OUT-R
Figure 7. Headphone Application Circuit
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX4295 | Mono/Stereo 2W Switch-Mode (Class-D) Audio Power Amplifiers |
| MAX4295EEE | Mono/Stereo 2W Switch-Mode (Class-D) Audio Power Amplifiers |
| MAX4295ESE | Mono/Stereo 2W Switch-Mode (Class-D) Audio Power Amplifiers |
| MAX4297 | Mono/Stereo 2W Switch-Mode (Class-D) Audio Power Amplifiers |
| MAX4297EAG | Mono/Stereo 2W Switch-Mode (Class-D) Audio Power Amplifiers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4297EWG+T | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX4297EWG-T | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX4298ESD | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX4298ESD+ | 功能描述:音頻放大器 High PSRR Stereo Driver + Mic Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX4298ESD+T | 功能描述:音頻放大器 High PSRR Stereo Driver + Mic Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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