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| 型號(hào)： | MAX4295ESE+T |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 4/15頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO PWR 2W MONO 16SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | D 類 |
| 輸出類型： | 1-通道（單聲道） |
| 在某負(fù)載時(shí)最大輸出功率 x 通道數(shù)量： | 2W x 1 @ 4 歐姆 |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 特點(diǎn)： | 消除爆音，短路保護(hù)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： | 16-SOIC |
| 封裝/外殼： | 16-SOIC（0.154"，3.90mm 寬） |
| 包裝： | 帶卷 (TR) |
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MAX4295
Mono, 2W, Switch-Mode (Class D)
Audio Power Amplifier
12
______________________________________________________________________________________
Cc
RL
C1
OUT+
OUT-
16
MAX4295
L1a
1
Figure 5. MAX4295 Single-Ended Configuration
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 can be used as either a BTL or single-
ended configured amplifier. The BTL configuration offers
several advantages over a single-ended configuration.
By driving the load differentially, the output voltage swing
is doubled and the output power is quadrupled in com-
parison to a single-ended configuration. Because the dif-
ferential outputs are biased at half supply, there is no DC
voltage across the load, eliminating the need for large
DC-blocking capacitors at the output.
The MAX4295 can be configured as a single-ended
amplifier. In such a case, the load must be capacitively
coupled to the filter to block the half-supply 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.
Total Harmonic Distortion
The MAX4295 exhibits typical THD+N of <1% for input
frequencies <10kHz. The PWM frequency affects THD
performance. THD can be reduced by limiting the input
bandwidth through the input highpass filter, choosing
the lowest fOSC possible, and carefully 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
PVCC. For optimal performance, a 330F, low-ESR
POSCAP capacitor to PGND and a 1F ceramic capac-
itor to GND at each PVCC input is suggested. Place the
1F capacitor close to the PVCC pin. Bypass VCC with
a 10F capacitor in parallel with a 1F capacitor to
GND. Ceramic capacitors are recommended due to
their low ESR.
Good PC board layout techniques optimize perfor-
mance by decreasing the amount of stray capacitance
at the amplifier’s inputs and outputs. To decrease stray
capacitance, minimize trace lengths by placing exter-
nal components as close as possible to the amplifier.
Surface-mount components are recommended.
The MAX4295 requires two separate ground planes to
prevent switching noise from the MOSFETs in the H-
bridge from coupling into the rest of the circuit. PGND,
the power ground, is utilized by the H-bridge and any
external output components, while GND is used by the
rest of the circuit. Connect the PGND and GND planes
at only one point, as close to the power supply as pos-
sible. Any external components associated with the
output of the MAX4295 must be connected to the
PGND plane where applicable. Use the Typical
Operating Circuit diagram as a reference. Refer to the
evaluation kit manual for suggested component values,
component suppliers, and layout.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4295EVKIT | 制造商:Maxim Integrated Products 功能描述:EVALUATION KIT FOR THE MAX4295 - Bulk |
| MAX4297EAG | 功能描述:音頻放大器 Integrated Circuits (ICs) 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 |
| MAX4297EAG+ | 功能描述:音頻放大器 Integrated Circuits (ICs) 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 |
| MAX4297EAG+T | 功能描述:音頻放大器 Integrated Circuits (ICs) 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 |
| MAX4297EAG-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 |
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