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參數(shù)資料
| 型號： | LQA28A |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 3V, 1W Boosted Boomer |
| 中文描述： | 3V的，1W的，細(xì)看布瑪 |
| 文件頁數(shù)： | 11/18頁 |
| 文件大?。?/td> | 1063K |
| 代理商： | LQA28A |
Typical Performance Characteristics
(Continued)
Maximum Duty Cycle
vs Temperature - ”X”
R
DS
(ON)
vs Temperature
20126245
20126247
R
(ON)
vs V
DD
20126248
Application Information
BRIDGE CONFIGURATION EXPLANATION
The Audio Amplifier portion of the LM4805 has two internal
amplifiers allowing different amplifier configurations. The first
amplifier’s gain is externally configurable, whereas the sec-
ond amplifier is internally fixed in a unity-gain, inverting
configuration. The closed-loop gain of the first amplifier is set
by selecting the ratio of Rf to Ri while the second amplifier’s
gain is fixed by the two internal 20k
resistors. Figure 1
shows that the output of amplifier one serves as the input to
amplifier two. This results in both amplifiers producing sig-
nals identical in magnitude, but out of phase by 180. Con-
sequently, the differential gain for the Audio Amplifier is
A
VD
= 2 *(Rf/Ri)
By driving the load differentially through outputs VO1 and
VO2, an amplifier configuration commonly referred to as
“bridged mode” is established. Bridged mode operation is
different from the classic single-ended amplifier configura-
tion where one side of the load is connected to ground.
A bridge amplifier design has a few distinct advantages over
the single-ended configuration. It provides differential drive
to the load, thus doubling the output swing for a specified
supply voltage. Four times the output power is possible as
compared to a single-ended amplifier under the same con-
ditions. This increase in attainable output power assumes
that the amplifier is not current limited or clipped. In order to
choose an amplifier’s closed-loop gain without causing ex-
cessive clipping, please refer to the
Audio Power Amplifier
Design
section.
The bridge configuration also creates a second advantage
over single-ended amplifiers. Since the differential outputs,
VO1 and VO2, are biased at half-supply, no net DC voltage
exists across the load. This eliminates the need for an output
coupling capacitor which is required in a single supply,
single-ended amplifier configuration. Without an output cou-
pling capacitor, the half-supply bias across the load would
result in both increased internal IC power dissipation and
also possible loudspeaker damage.
AMPLIFIER POWER DISSIPATION
Power dissipation is a major concern when designing a
successful amplifier, whether the amplifier is bridged or
single-ended. A direct consequence of the increased power
delivered to the load by a bridge amplifier is an increase in
internal power dissipation. Since the amplifier portion of the
LM4805 has two operational amplifiers, the maximum inter-
L
www.national.com
11
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| LQA30A300C | 功能描述:整流器 Q-Series 300V 15A Dual Ultra-Low Qrr RoHS:否 制造商:Vishay Semiconductors 產(chǎn)品:Standard Recovery Rectifiers 配置: 反向電壓:100 V 正向電壓下降: 恢復(fù)時間:1.2 us 正向連續(xù)電流:2 A 最大浪涌電流:35 A 反向電流 IR:5 uA 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DO-221AC 封裝:Reel |
| LQA30B200C | 功能描述:二極管 - 通用，功率，開關(guān) 200V, Dual, 15A Ultra-Low Qrr IC RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Switching Diodes 峰值反向電壓:600 V 正向連續(xù)電流:200 A 最大浪涌電流:800 A 配置: 恢復(fù)時間:2000 ns 正向電壓下降:1.25 V 最大反向漏泄電流:300 uA 最大功率耗散: 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:ISOTOP 封裝:Tube |
| LQA30N200C | 功能描述:整流器 200V, Dual, 15A Ultra-Low Qrr IC RoHS:否 制造商:Power Integrations 產(chǎn)品: 配置: 反向電壓: 正向電壓下降: 恢復(fù)時間: 正向連續(xù)電流: 最大浪涌電流: 反向電流 IR: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Reel |
| LQA30T200C | 功能描述:整流器 200V, Dual, 15A Ultra-Low Qrr IC RoHS:否 制造商:Power Integrations 產(chǎn)品:Fast Recovery Rectifiers 配置:Dual 反向電壓:200 V 正向電壓下降:1.2 V 恢復(fù)時間:16.5 ns 正向連續(xù)電流:15 A 最大浪涌電流:130 A 反向電流 IR:500 uA 安裝風(fēng)格:Through Hole 封裝 / 箱體:TO-220AB 封裝:Tube |
| LQA30T300 | 功能描述:整流器 Q-Series 300V 30A Ultra Low Qrr RoHS:否 制造商:Vishay Semiconductors 產(chǎn)品:Standard Recovery Rectifiers 配置: 反向電壓:100 V 正向電壓下降: 恢復(fù)時間:1.2 us 正向連續(xù)電流:2 A 最大浪涌電流:35 A 反向電流 IR:5 uA 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DO-221AC 封裝:Reel |
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