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Part: LA4906
Category:
Analog & Mixed-Signal Processing
Description: 17W, 2-channel BTL af High-efficiency Power Amplifier For Car Audio System
Company: Sanyo Semiconductor Corporation
Datasheet: Download LA4906 datasheet File size : 355 kB
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Datasheet text preview:
Ordering number : ENN*5714A
Monolithic Linear IC
LA4906
17-W, 2-Channel BTL AF High-Efficiency Power Amplifier for Car Audio Systems
Preliminary Overview
The LA4906 is a BTL two-channel power amplifier for u s e in car audio systems. It uses a signal-following switching technique in the power supply for the amplifier output stage and a newly-developed nonlinear amplifier that features nonlinear characteristics in the signal system. These features hold increases in the number of external components to a minimum, and reduce power dissipation (and thus heat generation) in the practical operating region to about 1/2 that of earlier class B amplifier ICs. This can c o n t r i b u t e significantly to miniaturization and weight reduction in the heat sink and to reduction of the heat generated within the end product case. · Uses a single-voltage power supply from 8 to 18 V. · P r o v i d e s a full range of built-in protection circuits, including shorting of output pin to VCC, shorting of o u t p u t pin to ground, overvoltage, and thermal shutdown protection. · Built-in standby switch · Clipping detection function
Package Dimensions
unit: mm 3160-SIP23HZ
[LA4906]
37.0 30.0 R1.7 4.5
Features
· Power dissipation reduced by 50% (for music at average power levels, as compared to earlier Sanyo products) · T h e number of required signal-following switching circuits has been reduced to just one circuit for two channels, reducing the number of external components. · The output is a pure analog signal; no switching noise whatsoever appears on the output lines.
13.8 9.5 3.6 16.8
1
2.0 0.5 0.9
23
R=0.4 0.4
1.8
2.45
1.5
SANYO: SIP23HZ
Specifications
Maximum Ratings at Ta = 25°C
Parameter Maximum supply voltage Maximum output current Allowable power dissipation Operating temperature Storage temperature Symbol VCC max1 VCC max2 IO Peak Pd max Topr Tstg Per channel With an arbitrarily large heat sink Conditions With no signal, t = 1 minute Ratings 18 16 4.5 37.5 35 to +85 40 to +150 Unit V V A W °C °C
Notes: 1. Set VCC and RL to be in the range where Pd max does not exceed 37.5 W. 2. The overvoltage protection circuit operates at VCC = 26 V or higher.
Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft's control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications. SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO products described or contained herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
41000TN (OT)/73097HA(OT) No. 5714-1/10
LA4906 Operating Conditions at Ta = 25°C
Parameter Recommended supply voltage Allowable operating voltage range Recommended load resistance Recommended load resistance range Symbol VCC VCC op RL RL op Conditions Ratings 13.2 8 to 16 4 2 to 4 Unit V V
Note: Set VCC and RL to be in the range where Pd max does not exceed 37.5 W.
Operating Characteristics at Ta = 25°C, VCC = 13.2 V, RL = 4 , f = 1 kHz, RG = 600 , in the recommended circuit
Parameter Quiescent current drain Standby current Voltage gain Total harmonic distortion Output power Output noise voltage Ripple rejection ratio Symbol ICCO Ist VG THD PO1 PO2 VNO SVRR VO = 0 dBm PO = 1 W, LPF = 30 kHz THD = 10 %, RL = 4 THD = 10 %, RL = 2 Rg = 0, BPF = 20 Hz to 20 kHz Rg = 0, VCCR = 0 dBm, BPF = 20 Hz to 20 kHz Rg = 10 k, VO = 0 dBm, BPF = 20 Hz to 20 kHz 60 14 28 RL = , VIN = 0 Conditions Ratings min 80 typ 110 0 30 0.07 17 25 0.10 75 0.3 max 150 10 32 0.2 Unit mA µA dB % W W mVrms dB
Channel separation Input resistance Output offset voltage Standby on voltage Clipping detect off current Clipping detect on current
CH sep Ri
45 21 200 3
60 30 39 +200 VCC 1 10 200 150
dB k mV V µA µA
VN offset Rg = 0 VSTH IDOFF IDON AMP = on, applied through a 10 k resistor THD = 1 % THD = 10 %
100
With an arbitrarily large heat sink
Allowable power dissipation, Pd max W
Heat sink thermal resistance, f °C/W
Al heat sink, t = 1.5 mm Tightening torque: 39 N·cm With silicone grease applied.
Ambient temperature, Ta °C
Heat sink area, Sf cm2
No. 5714-2/10
LA4906 Technologies for Increased Efficiency Used in the LA4906 · 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 t h e signal. Also, the LA4906 restricts the number of switching regulators required to just one circuit even though it implements a B T L 2-channel amplifier by using the switching regulator in combination with the nonlinear amplifier described below. (See Figure 1.)
Regulator output
Nonlinear amplifier
Amplifier output stage
Figure 1 Overview Block Diagram · 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 e x p a n d e d and compressed as shown in Figure 3, the combined output waveform at the load terminals is identical to that of earlier products. Figure 2 Nonlinear Amplifier Input/Output Characteristics
Loss in the output transistor
Regulator output (point C)
Positive phase output (point A) Center point Ground
Power dissipation, Pd W
Regulator output (point C)
RL = 4 f = 1 kHz Rg = 600 With both channels driven. Calculated at Pd = VCC × ICC 2 PO
Reverse phase output (point B) Center point Ground
Earlier SANYO products (class B amplifiers) LA4705NA
Waveform between the outputs (Between A and B)
High-efficiency LA4906
Output power, PO W
Figure 3 Output Waveforms
Figure 4 Power Dissipation Comparison with Earlier Sanyo Products
No. 5714-3/10
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