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參數(shù)資料
| 型號(hào)： | LA4906 |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 25 W, 2 CHANNEL, AUDIO AMPLIFIER, ZFM23 |
| 封裝： | SIP-23 |
| 文件頁數(shù)： | 4/10頁 |
| 文件大?。?/td> | 604K |
| 代理商： | LA4906 |
No. 5714-3/10
LA4906
Technologies for Increased Efficiency Used in the LA4906
Nonlinear amplifier
The LA4906 adopts a nonlinear amplifier, which has the nonlinear
characteristics shown in Figure 2, in the signal system. The LA4906
dispenses with the lower side switching regulator by using a low 2 V
as the midpoint voltage instead of the 1/2 VCC used in normal
amplifiers.
This nonlinear amplifier is basically formed from a differential
amplifier that has a symmetrical negative feedback circuit. Although
the BTL output stage positive and reverse phase output waveforms
have a half-wave waveform that, when referenced to ground, is
expanded and compressed as shown in Figure 3, the combined
output waveform at the load terminals is identical to that of earlier
products.
Signal-following switching technique
The LA4906 uses a switching regulator for the power supply for the
amplifier output stage. The LA4906 significantly reduces power
dissipation by having the switching regulator output voltage follow
the signal. Also, the LA4906 restricts the number of switching
regulators required to just one circuit even though it implements a
BTL 2-channel amplifier by using the switching regulator in
combination with the nonlinear amplifier described below. (See
Figure 1.)
Figure 1 Overview Block Diagram
Figure 2 Nonlinear Amplifier
Input/Output Characteristics
Figure 3 Output Waveforms
Figure 4 Power Dissipation Comparison with
Earlier Sanyo Products
RL = 4 Ω
f = 1 kHz
Rg = 600 Ω
With both channels
driven.
Calculated at Pd =
VCC × ICC – 2 PO
Regulator
output
Amplifier
output
stage
Nonlinear
amplifier
Loss in the output
transistor
Regulator output (point C)
Positive phase
output (point A)
Center point
Ground
Reverse phase
output (point B)
Center point
Ground
Waveform between
the outputs
(Between A and B)
Power
dissipation,
Pd
–
W
Output power, PO – W
High-efficiency
LA4906
Earlier SANYO
products (class
B amplifiers)
LA4705NA
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LA4917H | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Monolithic Linear IC Audio Output for TV application High-Effciency Two-Channel 7W BTL Power Amplifier ICs |
| LA4919N | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Monolithic Linear IC Two-Channel 10W BTL High-Efficiency TV Audio Output Power Amplifier |
| LA4B-M1C2LV-G | 制造商:IDEC CORPORATION 功能描述:Switch Push Button N.O./N.C. DPDT Flush Rectangular Button 0.1A 250VAC 250VDC Momentary Contact PC Pins Panel Mount/Through Hole |
| LA4B-M1C2LV-W | 制造商:IDEC CORPORATION 功能描述:Switch Push Button N.O./N.C. DPDT Flush Rectangular Button 0.1A 250VAC 250VDC Momentary Contact PC Pins Panel Mount/Through Hole |
| LA4CA00 | 制造商:TE Connectivity 功能描述: |
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