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參數(shù)資料
| 型號： | MAX4295ESE+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 3/15頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO PWR 2W MONO 16SOIC |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 類型： | D 類 |
| 輸出類型： | 1-通道（單聲道） |
| 在某負載時最大輸出功率 x 通道數(shù)量： | 2W x 1 @ 4 歐姆 |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 特點： | 消除爆音，短路保護和熱保護，關閉 |
| 安裝類型： | 表面貼裝 |
| 供應商設備封裝： | 16-SOIC |
| 封裝/外殼： | 16-SOIC（0.154"，3.90mm 寬） |
| 包裝： | 帶卷 (TR) |
MAX4295
Mono, 2W, Switch-Mode (Class D)
Audio Power Amplifier
______________________________________________________________________________________
11
Output Filter
An output filter is required to attenuate the PWM switch-
ing frequency. Without the filter, the ripple in the load
can substantially degrade efficiency and may cause
interference problems with other electronic equipment.
A Butterworth lowpass filter is chosen for its flat
passband and nice phase response, though other filter
implementations may also be used. Three examples
are presented below. The filter parameters for bal-
anced 2-pole (Figure 4b) and 4-pole (Figure 4d)
Butterworth filters are taken from Electronic Filter
Design Handbook by Arthur B. Williams, McGraw Hill,
Inc. These filter designs assume that the load is purely
resistive and load impedance is constant over frequen-
cy. Calculation of filter component values should
include the DC resistance of the inductors and take into
account the worst-case load scenario:
Single Ended 2-Pole Filter (Figure 4a)
C = 1 / (
√2 RL ωo), L = √2 RL / ωo
where
ωo = 2 π fo (fo = filter cutoff frequency);
choosing fo = 30kHz and RL = 4
, C = 0.937F, L =
30H.
A single-ended 2-pole filter uses the minimum number
of external components, but the load (speaker) sees
the large common-mode switching voltage, which can
increase power dissipation and cause EMI problems.
Balanced 2-Pole (Figure 4b):
A balanced 2-pole filter does not have the common-
mode swing problem of the single-ended filter.
C = 2 / (
√2 RL ωo), L = (√2 RL)/(2 ωo); choosing
fo = 30kHz and RL = 4
, C1a = C1b = 2.0F, L1a =
L1b = 15H.
A single capacitor connected across RL, with a value of
CL = 1/(
√2 RL ωo), can be used in place of C1a and
C1b. However, the configuration as shown gives an
improved rejection to common-mode signal compo-
nents of OUT+_ and OUT-_. If the single capacitor
scheme is used, additional capacitors (Ca and Cb) can
be added from each side of RL, providing a high-fre-
quency short to ground (Figure 4c). These capacitors
should be approximately 0.2 CL.
Balanced 4-Pole Filter (Figure 4d)
A balanced 4-pole filter is more effective in suppress-
ing the switching frequency and its harmonics.
For the 4-pole Butterworth filter, the normalized values
are: L1N = 1.5307, L2N = 1.0824, C1N = 1.5772, C2N =
0.3827.
The actual inductance and capacitance values for fO =
30kHz and a bridge-tied load of RL = 4
are given by:
L1 = (L1N RL ) / (2
ωo) = 16.24H, L2 = (L2N RL) /
(2
ωo) = 11.5H, C1 = C1N / (RL ωo) = 2.1F, C2a =
C2b = (2 C2N) / (RL
ωo) = 1.0F.
OUT+
OUT-
L
C
RL
Figure 4a. Single-Ended 2-Pole Filter
OUT+
OUT-
L1
C1a
RL
L2
C1b
Figure 4b. Balanced 2-Pole Filter
OUT+
OUT-
L1
Ca
RL
L2
Cb
CL
Figure 4c. Alternate Balanced 2-Pole Filter
OUT+
OUT-
L2a
C2a
RL
L2b
C2b
L1b
L1a
C1
Figure 4d. Balanced 4-Pole Filter
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相關代理商/技術參數(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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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