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參數(shù)資料
| 型號： | MAX9768EVKIT+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 6/26頁 |
| 文件大小： | 0K |
| 描述： | EVALUATION KIT FOR MAX9768 |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 1 |
| 放大器類型： | 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： | 10W x 1 @ 8 歐姆 |
| 電源電壓： | 4.5 V ~ 14 V |
| 工作溫度： | -40°C ~ 85°C |
| 板類型： | 完全填充 |
| 已用 IC / 零件： | MAX9768 |
| 已供物品： | 板 |
Filterless Modulation/PWM Modulation
The MAX9768 features two output modulation
schemes: filterless modulation or classic PWM, selec-
table through SCLK when the device is in analog mode
(ADDR2 and ADDR1 = GND, Table 2) or through the
I2C interface (Table 7). Maxim’s unique, filterless modu-
lation scheme eliminates the LC filter required by tradi-
tional Class D amplifiers, reducing component count,
conserving board space and system cost. Although the
MAX9768 meets FCC and other EMI limits with a low-
cost ferrite bead filter, many applications still may want
to use a full LC-filtered output. If using a full LC filter,
the performance is best with the MAX9768 configured
for classic PWM output.
Switching between schemes while in normal operating
mode with the I2C interface, the output is not click-and-
pop protected. To have click-and-pop protection when
switching between output schemes, the device must
enter shutdown mode and be configured to the new out-
put scheme before the startup sequence is terminated.
The startup time for the MAX9768 is typically 220ms.
The startup time for the MAX9768B is typically 15ms.
Efficiency
Efficiency of a Class D amplifier is due to the switching
operation of the output stage transistors. In a Class D
amplifier, the output transistors act as current-steering
switches and consume negligible additional power.
Any power loss associated with the Class D output
stage is mostly due to the I2R loss of the MOSFET on-
resistance, and quiescent-current overhead.
The theoretical best efficiency of a linear amplifier is
78%, however, that efficiency is only exhibited at peak
output power. Under normal operating levels (typical
music reproduction levels), efficiency falls below 30%,
whereas the MAX9768 still exhibits > 80% efficiencies
under the same conditions (Figure 2).
Soft Current Limit
When the output current exceeds the soft current limit,
2A (typ), the MAX9768 enters a cycle-by-cycle current-
limit mode. In soft current-limit mode, the output is
clipped at 2A. When the output decreases so the out-
put current falls below 2A, normal operation resumes.
The effect of soft current limiting is a slight increase in
distortion. Most applications will not enter soft current-
limit mode unless the speaker or filter creates imped-
ance nulls below 8
Ω.
MAX9768
10W Mono Class D Speaker
Amplifier with Volume Control
14
______________________________________________________________________________________
Table 2. Modulation Scheme Selection In Analog Mode
ADDR2
ADDR1
SDA/VOL
SCLK
FUNCTION
0
Analog Volume Control
0
Filterless Modulation
0
Analog Volume Control
1
Classic PWM (50% Duty Cycle)
EFFICIENCY vs. OUTPUT POWER
MAX9768
fig02
OUTPUT POWER (W)
EFFICIENCY
(%)
8
6
4
2
10
20
30
40
50
60
70
80
90
100
0
010
MAX9768
CLASS AB
PVDD = 12V
fIN = 1kHz
RL = 8
Ω
Figure 2. MAX9768 Efficiency vs. Class AB Efficiency
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9768EVKIT+ | 功能描述:音頻 IC 開發(fā)工具 MAX9768 Eval Kit RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| MAX976ESA | 功能描述:校驗器 IC Dual High Speed Comparator RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MAX976ESA+ | 功能描述:校驗器 IC Dual High Speed Comparator RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MAX976ESA+T | 功能描述:校驗器 IC Dual High Speed Comparator RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MAX976ESA-T | 功能描述:校驗器 IC Dual High Speed Comparator RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
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